Source code for statsmodels.iolib.summary
from statsmodels.compat.python import lmap, lrange, lzip
import copy
from itertools import zip_longest
import time
import numpy as np
from statsmodels.iolib.table import SimpleTable
from statsmodels.iolib.tableformatting import (
fmt_2,
fmt_2cols,
fmt_params,
gen_fmt,
)
from .summary2 import _model_types
def forg(x, prec=3):
x = np.squeeze(x)
if prec == 3:
# for 3 decimals
if (abs(x) >= 1e4) or (abs(x) < 1e-4):
return '%9.3g' % x
else:
return '%9.3f' % x
elif prec == 4:
if (abs(x) >= 1e4) or (abs(x) < 1e-4):
return '%10.4g' % x
else:
return '%10.4f' % x
else:
raise ValueError("`prec` argument must be either 3 or 4, not {prec}"
.format(prec=prec))
def d_or_f(x, width=6):
"""convert number to string with either integer of float formatting
This is used internally for nobs and degrees of freedom which are usually
integers but can be float in some cases.
Parameters
----------
x : int or float
width : int
only used if x is nan
Returns
-------
str : str
number as formatted string
"""
if np.isnan(x):
return (width - 3) * ' ' + 'NaN'
if x // 1 == x:
return "%#6d" % x
else:
return "%#8.2f" % x
def summary(self, yname=None, xname=None, title=0, alpha=.05,
returns='text', model_info=None):
"""
Parameters
----------
yname : str
optional, Default is `Y`
xname : list[str]
optional, Default is `X.#` for # in p the number of regressors
Confidance interval : (0,1) not implimented
title : str
optional, Defualt is 'Generalized linear model'
returns : str
'text', 'table', 'csv', 'latex', 'html'
Returns
-------
Default :
returns='print'
Prints the summarirized results
Option :
returns='text'
Prints the summarirized results
Option :
returns='table'
SimpleTable instance : summarizing the fit of a linear model.
Option :
returns='csv'
returns a string of csv of the results, to import into a spreadsheet
Option :
returns='latex'
Not implimented yet
Option :
returns='HTML'
Not implimented yet
Examples (needs updating)
--------
>>> import statsmodels as sm
>>> data = sm.datasets.longley.load()
>>> data.exog = sm.add_constant(data.exog)
>>> ols_results = sm.OLS(data.endog, data.exog).results
>>> print ols_results.summary()
...
Notes
-----
conf_int calculated from normal dist.
"""
if title == 0:
title = _model_types[self.model.__class__.__name__]
if xname is not None and len(xname) != len(self.params):
# GH 2298
raise ValueError('User supplied xnames must have the same number of '
'entries as the number of model parameters '
'({})'.format(len(self.params)))
yname, xname = _getnames(self, yname, xname)
time_now = time.localtime()
time_of_day = [time.strftime("%H:%M:%S", time_now)]
date = time.strftime("%a, %d %b %Y", time_now)
modeltype = self.model.__class__.__name__
nobs = self.nobs
df_model = self.df_model
df_resid = self.df_resid
#General part of the summary table, Applicable to all? models
#------------------------------------------------------------
# TODO: define this generically, overwrite in model classes
#replace definition of stubs data by single list
#e.g.
gen_left = [('Model type:', [modeltype]),
('Date:', [date]),
('Dependent Variable:', yname), # TODO: What happens with multiple names?
('df model', [df_model])
]
gen_stubs_left, gen_data_left = zip_longest(*gen_left) #transpose row col
gen_title = title
gen_header = None
gen_table_left = SimpleTable(gen_data_left,
gen_header,
gen_stubs_left,
title=gen_title,
txt_fmt=gen_fmt
)
gen_stubs_right = ('Method:',
'Time:',
'Number of Obs:',
'df resid')
gen_data_right = ([modeltype], #was dist family need to look at more
time_of_day,
[nobs],
[df_resid]
)
gen_table_right = SimpleTable(gen_data_right,
gen_header,
gen_stubs_right,
title=gen_title,
txt_fmt=gen_fmt
)
gen_table_left.extend_right(gen_table_right)
general_table = gen_table_left
# Parameters part of the summary table
# ------------------------------------
# Note: this is not necessary since we standardized names,
# only t versus normal
tstats = {'OLS': self.t(),
'GLS': self.t(),
'GLSAR': self.t(),
'WLS': self.t(),
'RLM': self.t(),
'GLM': self.t()}
prob_stats = {'OLS': self.pvalues,
'GLS': self.pvalues,
'GLSAR': self.pvalues,
'WLS': self.pvalues,
'RLM': self.pvalues,
'GLM': self.pvalues
}
# Dictionary to store the header names for the parameter part of the
# summary table. look up by modeltype
alp = str((1-alpha)*100)+'%'
param_header = {
'OLS' : ['coef', 'std err', 't', 'P>|t|', alp + ' Conf. Interval'],
'GLS' : ['coef', 'std err', 't', 'P>|t|', alp + ' Conf. Interval'],
'GLSAR' : ['coef', 'std err', 't', 'P>|t|', alp + ' Conf. Interval'],
'WLS' : ['coef', 'std err', 't', 'P>|t|', alp + ' Conf. Interval'],
'GLM' : ['coef', 'std err', 't', 'P>|t|', alp + ' Conf. Interval'], #glm uses t-distribution
'RLM' : ['coef', 'std err', 'z', 'P>|z|', alp + ' Conf. Interval'] #checke z
}
params_stubs = xname
params = self.params
conf_int = self.conf_int(alpha)
std_err = self.bse
exog_len = lrange(len(xname))
tstat = tstats[modeltype]
prob_stat = prob_stats[modeltype]
# Simpletable should be able to handle the formating
params_data = lzip(["%#6.4g" % (params[i]) for i in exog_len],
["%#6.4f" % (std_err[i]) for i in exog_len],
["%#6.4f" % (tstat[i]) for i in exog_len],
["%#6.4f" % (prob_stat[i]) for i in exog_len],
["(%#5g, %#5g)" % tuple(conf_int[i]) for i in exog_len])
parameter_table = SimpleTable(params_data,
param_header[modeltype],
params_stubs,
title=None,
txt_fmt=fmt_2
)
#special table
#-------------
#TODO: exists in linear_model, what about other models
#residual diagnostics
#output options
#--------------
#TODO: JP the rest needs to be fixed, similar to summary in linear_model
def ols_printer():
"""
print summary table for ols models
"""
table = str(general_table)+'\n'+str(parameter_table)
return table
def glm_printer():
table = str(general_table)+'\n'+str(parameter_table)
return table
printers = {'OLS': ols_printer, 'GLM': glm_printer}
if returns == 'print':
try:
return printers[modeltype]()
except KeyError:
return printers['OLS']()
def _getnames(self, yname=None, xname=None):
'''extract names from model or construct names
'''
if yname is None:
if getattr(self.model, 'endog_names', None) is not None:
yname = self.model.endog_names
else:
yname = 'y'
if xname is None:
if getattr(self.model, 'exog_names', None) is not None:
xname = self.model.exog_names
else:
xname = ['var_%d' % i for i in range(len(self.params))]
return yname, xname
def summary_top(results, title=None, gleft=None, gright=None, yname=None, xname=None):
'''generate top table(s)
TODO: this still uses predefined model_methods
? allow gleft, gright to be 1 element tuples instead of filling with None?
'''
#change of names ?
gen_left, gen_right = gleft, gright
# time and names are always included
time_now = time.localtime()
time_of_day = [time.strftime("%H:%M:%S", time_now)]
date = time.strftime("%a, %d %b %Y", time_now)
yname, xname = _getnames(results, yname=yname, xname=xname)
# create dictionary with default
# use lambdas because some values raise exception if they are not available
default_items = dict([
('Dependent Variable:', lambda: [yname]),
('Dep. Variable:', lambda: [yname]),
('Model:', lambda: [results.model.__class__.__name__]),
('Date:', lambda: [date]),
('Time:', lambda: time_of_day),
('Number of Obs:', lambda: [results.nobs]),
('No. Observations:', lambda: [d_or_f(results.nobs)]),
('Df Model:', lambda: [d_or_f(results.df_model)]),
('Df Residuals:', lambda: [d_or_f(results.df_resid)]),
('Log-Likelihood:', lambda: ["%#8.5g" % results.llf]) # does not exist for RLM - exception
])
if title is None:
title = results.model.__class__.__name__ + 'Regression Results'
if gen_left is None:
# default: General part of the summary table, Applicable to all? models
gen_left = [('Dep. Variable:', None),
('Model type:', None),
('Date:', None),
('No. Observations:', None),
('Df model:', None),
('Df resid:', None)]
try:
llf = results.llf # noqa: F841
gen_left.append(('Log-Likelihood', None))
except: # AttributeError, NotImplementedError
pass
gen_right = []
gen_title = title
gen_header = None
# replace missing (None) values with default values
gen_left_ = []
for item, value in gen_left:
if value is None:
value = default_items[item]() # let KeyErrors raise exception
gen_left_.append((item, value))
gen_left = gen_left_
if gen_right:
gen_right_ = []
for item, value in gen_right:
if value is None:
value = default_items[item]() # let KeyErrors raise exception
gen_right_.append((item, value))
gen_right = gen_right_
# check nothing was missed
missing_values = [k for k,v in gen_left + gen_right if v is None]
assert missing_values == [], missing_values
# pad both tables to equal number of rows
if gen_right:
if len(gen_right) < len(gen_left):
# fill up with blank lines to same length
gen_right += [(' ', ' ')] * (len(gen_left) - len(gen_right))
elif len(gen_right) > len(gen_left):
# fill up with blank lines to same length, just to keep it symmetric
gen_left += [(' ', ' ')] * (len(gen_right) - len(gen_left))
# padding in SimpleTable does not work like I want
#force extra spacing and exact string length in right table
gen_right = [('%-21s' % (' '+k), v) for k,v in gen_right]
gen_stubs_right, gen_data_right = zip_longest(*gen_right) #transpose row col
gen_table_right = SimpleTable(gen_data_right,
gen_header,
gen_stubs_right,
title=gen_title,
txt_fmt=fmt_2cols
)
else:
gen_table_right = [] #because .extend_right seems works with []
#moved below so that we can pad if needed to match length of gen_right
#transpose rows and columns, `unzip`
gen_stubs_left, gen_data_left = zip_longest(*gen_left) #transpose row col
gen_table_left = SimpleTable(gen_data_left,
gen_header,
gen_stubs_left,
title=gen_title,
txt_fmt=fmt_2cols
)
gen_table_left.extend_right(gen_table_right)
general_table = gen_table_left
return general_table
def summary_params(results, yname=None, xname=None, alpha=.05, use_t=True,
skip_header=False, title=None):
'''create a summary table for the parameters
Parameters
----------
res : results instance
some required information is directly taken from the result
instance
yname : {str, None}
optional name for the endogenous variable, default is "y"
xname : {list[str], None}
optional names for the exogenous variables, default is "var_xx"
alpha : float
significance level for the confidence intervals
use_t : bool
indicator whether the p-values are based on the Student-t
distribution (if True) or on the normal distribution (if False)
skip_headers : bool
If false (default), then the header row is added. If true, then no
header row is added.
Returns
-------
params_table : SimpleTable instance
'''
# Parameters part of the summary table
# ------------------------------------
# Note: this is not necessary since we standardized names,
# only t versus normal
if isinstance(results, tuple):
# for multivariate endog
# TODO: check whether I do not want to refactor this
#we need to give parameter alpha to conf_int
results, params, std_err, tvalues, pvalues, conf_int = results
else:
params = np.asarray(results.params)
std_err = np.asarray(results.bse)
tvalues = np.asarray(results.tvalues) # is this sometimes called zvalues
pvalues = np.asarray(results.pvalues)
conf_int = np.asarray(results.conf_int(alpha))
if params.size == 0:
return SimpleTable([['No Model Parameters']])
# Dictionary to store the header names for the parameter part of the
# summary table. look up by modeltype
if use_t:
param_header = ['coef', 'std err', 't', 'P>|t|',
'[' + str(alpha/2), str(1-alpha/2) + ']']
else:
param_header = ['coef', 'std err', 'z', 'P>|z|',
'[' + str(alpha/2), str(1-alpha/2) + ']']
if skip_header:
param_header = None
_, xname = _getnames(results, yname=yname, xname=xname)
if len(xname) != len(params):
raise ValueError('xnames and params do not have the same length')
params_stubs = xname
exog_idx = lrange(len(xname))
params = np.asarray(params)
std_err = np.asarray(std_err)
tvalues = np.asarray(tvalues)
pvalues = np.asarray(pvalues)
conf_int = np.asarray(conf_int)
params_data = lzip([forg(params[i], prec=4) for i in exog_idx],
[forg(std_err[i]) for i in exog_idx],
[forg(tvalues[i]) for i in exog_idx],
["%#6.3f" % (pvalues[i]) for i in exog_idx],
[forg(conf_int[i,0]) for i in exog_idx],
[forg(conf_int[i,1]) for i in exog_idx])
parameter_table = SimpleTable(params_data,
param_header,
params_stubs,
title=title,
txt_fmt=fmt_params
)
return parameter_table
def summary_params_frame(results, yname=None, xname=None, alpha=.05,
use_t=True):
"""
Create a summary table for the parameters
Parameters
----------
res : results instance
some required information is directly taken from the result
instance
yname : {str, None}
optional name for the endogenous variable, default is "y"
xname : {list[str], None}
optional names for the exogenous variables, default is "var_xx"
alpha : float
significance level for the confidence intervals
use_t : bool
indicator whether the p-values are based on the Student-t
distribution (if True) or on the normal distribution (if False)
skip_headers : bool
If false (default), then the header row is added. If true, then no
header row is added.
Returns
-------
params_table : SimpleTable instance
"""
# Parameters part of the summary table
# ------------------------------------
# Note: this is not necessary since we standardized names,
# only t versus normal
if isinstance(results, tuple):
# for multivariate endog
# TODO: check whether I do not want to refactor this
#we need to give parameter alpha to conf_int
results, params, std_err, tvalues, pvalues, conf_int = results
else:
params = results.params
std_err = results.bse
tvalues = results.tvalues #is this sometimes called zvalues
pvalues = results.pvalues
conf_int = results.conf_int(alpha)
# Dictionary to store the header names for the parameter part of the
# summary table. look up by modeltype
if use_t:
param_header = ['coef', 'std err', 't', 'P>|t|',
'Conf. Int. Low', 'Conf. Int. Upp.']
else:
param_header = ['coef', 'std err', 'z', 'P>|z|',
'Conf. Int. Low', 'Conf. Int. Upp.']
_, xname = _getnames(results, yname=yname, xname=xname)
from pandas import DataFrame
table = np.column_stack((params, std_err, tvalues, pvalues, conf_int))
return DataFrame(table, columns=param_header, index=xname)
def summary_params_2d(result, extras=None, endog_names=None, exog_names=None,
title=None):
"""create summary table of regression parameters with several equations
This allows interleaving of parameters with bse and/or tvalues
Parameters
----------
result : result instance
the result instance with params and attributes in extras
extras : list[str]
additional attributes to add below a parameter row, e.g. bse or tvalues
endog_names : {list[str], None}
names for rows of the parameter array (multivariate endog)
exog_names : {list[str], None}
names for columns of the parameter array (exog)
alpha : float
level for confidence intervals, default 0.95
title : None or string
Returns
-------
tables : list of SimpleTable
this contains a list of all seperate Subtables
table_all : SimpleTable
the merged table with results concatenated for each row of the parameter
array
"""
if endog_names is None:
# TODO: note the [1:] is specific to current MNLogit
endog_names = ['endog_%d' % i for i in
np.unique(result.model.endog)[1:]]
if exog_names is None:
exog_names = ['var%d' % i for i in range(len(result.params))]
# TODO: check formatting options with different values
res_params = [[forg(item, prec=4) for item in row] for row in result.params]
if extras:
extras_list = [[['%10s' % ('(' + forg(v, prec=3).strip() + ')')
for v in col]
for col in getattr(result, what)]
for what in extras
]
data = lzip(res_params, *extras_list)
data = [i for j in data for i in j] #flatten
stubs = lzip(endog_names, *[['']*len(endog_names)]*len(extras))
stubs = [i for j in stubs for i in j] #flatten
else:
data = res_params
stubs = endog_names
txt_fmt = copy.deepcopy(fmt_params)
txt_fmt["data_fmts"] = ["%s"]*result.params.shape[1]
return SimpleTable(data, headers=exog_names,
stubs=stubs,
title=title,
txt_fmt=txt_fmt)
def summary_params_2dflat(result, endog_names=None, exog_names=None, alpha=0.05,
use_t=True, keep_headers=True, endog_cols=False):
"""summary table for parameters that are 2d, e.g. multi-equation models
Parameters
----------
result : result instance
the result instance with params, bse, tvalues and conf_int
endog_names : {list[str], None}
names for rows of the parameter array (multivariate endog)
exog_names : {list[str], None}
names for columns of the parameter array (exog)
alpha : float
level for confidence intervals, default 0.95
use_t : bool
indicator whether the p-values are based on the Student-t
distribution (if True) or on the normal distribution (if False)
keep_headers : bool
If true (default), then sub-tables keep their headers. If false, then
only the first headers are kept, the other headerse are blanked out
endog_cols : bool
If false (default) then params and other result statistics have
equations by rows. If true, then equations are assumed to be in columns.
Not implemented yet.
Returns
-------
tables : list of SimpleTable
this contains a list of all seperate Subtables
table_all : SimpleTable
the merged table with results concatenated for each row of the parameter
array
"""
res = result
params = res.params
if params.ndim == 2: # we've got multiple equations
n_equ = params.shape[1]
if len(endog_names) != params.shape[1]:
raise ValueError('endog_names has wrong length')
else:
if len(endog_names) != len(params):
raise ValueError('endog_names has wrong length')
n_equ = 1
#VAR does not have conf_int
#params = res.params.T # this is a convention for multi-eq models
# check that we have the right length of names
if not isinstance(endog_names, list):
# TODO: this might be specific to multinomial logit type, move?
if endog_names is None:
endog_basename = 'endog'
else:
endog_basename = endog_names
# TODO: note, the [1:] is specific to current MNLogit
endog_names = res.model.endog_names[1:]
tables = []
for eq in range(n_equ):
restup = (res, res.params[:,eq], res.bse[:,eq], res.tvalues[:,eq],
res.pvalues[:,eq], res.conf_int(alpha)[eq])
skiph = False
tble = summary_params(restup, yname=endog_names[eq],
xname=exog_names, alpha=alpha, use_t=use_t,
skip_header=skiph)
tables.append(tble)
# add titles, they will be moved to header lines in table_extend
for i in range(len(endog_names)):
tables[i].title = endog_names[i]
table_all = table_extend(tables, keep_headers=keep_headers)
return tables, table_all
def table_extend(tables, keep_headers=True):
"""extend a list of SimpleTables, adding titles to header of subtables
This function returns the merged table as a deepcopy, in contrast to the
SimpleTable extend method.
Parameters
----------
tables : list of SimpleTable instances
keep_headers : bool
If true, then all headers are kept. If falls, then the headers of
subtables are blanked out.
Returns
-------
table_all : SimpleTable
merged tables as a single SimpleTable instance
"""
from copy import deepcopy
for ii, t in enumerate(tables[:]): #[1:]:
t = deepcopy(t)
#move title to first cell of header
# TODO: check if we have multiline headers
if t[0].datatype == 'header':
t[0][0].data = t.title
t[0][0]._datatype = None
t[0][0].row = t[0][1].row
if not keep_headers and (ii > 0):
for c in t[0][1:]:
c.data = ''
# add separating line and extend tables
if ii == 0:
table_all = t
else:
r1 = table_all[-1]
r1.add_format('txt', row_dec_below='-')
table_all.extend(t)
table_all.title = None
return table_all
def summary_return(tables, return_fmt='text'):
# join table parts then print
if return_fmt == 'text':
strdrop = lambda x: str(x).rsplit('\n',1)[0]
# convert to string drop last line
return '\n'.join(lmap(strdrop, tables[:-1]) + [str(tables[-1])])
elif return_fmt == 'tables':
return tables
elif return_fmt == 'csv':
return '\n'.join(x.as_csv() for x in tables)
elif return_fmt == 'latex':
# TODO: insert \hline after updating SimpleTable
table = copy.deepcopy(tables[0])
for part in tables[1:]:
table.extend(part)
return table.as_latex_tabular()
elif return_fmt == 'html':
return "\n".join(table.as_html() for table in tables)
else:
raise ValueError('available output formats are text, csv, latex, html')
[docs]
class Summary:
"""
Result summary
Construction does not take any parameters. Tables and text can be added
with the `add_` methods.
Attributes
----------
tables : list of tables
Contains the list of SimpleTable instances, horizontally concatenated
tables are not saved separately.
extra_txt : str
extra lines that are added to the text output, used for warnings
and explanations.
"""
def __init__(self):
self.tables = []
self.extra_txt = None
def __str__(self):
return self.as_text()
def __repr__(self):
return str(type(self)) + '\n"""\n' + self.__str__() + '\n"""'
def _repr_html_(self):
"""Display as HTML in IPython notebook."""
return self.as_html()
def _repr_latex_(self):
"""Display as LaTeX when converting IPython notebook to PDF."""
return self.as_latex()
[docs]
def add_table_2cols(self, res, title=None, gleft=None, gright=None,
yname=None, xname=None):
"""
Add a double table, 2 tables with one column merged horizontally
Parameters
----------
res : results instance
some required information is directly taken from the result
instance
title : str, optional
if None, then a default title is used.
gleft : list[tuple], optional
elements for the left table, tuples are (name, value) pairs
If gleft is None, then a default table is created
gright : list[tuple], optional
elements for the right table, tuples are (name, value) pairs
yname : str, optional
optional name for the endogenous variable, default is "y"
xname : list[str], optional
optional names for the exogenous variables, default is "var_xx".
Must match the number of parameters in the model.
"""
table = summary_top(res, title=title, gleft=gleft, gright=gright,
yname=yname, xname=xname)
self.tables.append(table)
[docs]
def add_table_params(self, res, yname=None, xname=None, alpha=.05,
use_t=True):
"""create and add a table for the parameter estimates
Parameters
----------
res : results instance
some required information is directly taken from the result
instance
yname : {str, None}
optional name for the endogenous variable, default is "y"
xname : {list[str], None}
optional names for the exogenous variables, default is "var_xx"
alpha : float
significance level for the confidence intervals
use_t : bool
indicator whether the p-values are based on the Student-t
distribution (if True) or on the normal distribution (if False)
Returns
-------
None : table is attached
"""
if res.params.ndim == 1:
table = summary_params(res, yname=yname, xname=xname, alpha=alpha,
use_t=use_t)
elif res.params.ndim == 2:
_, table = summary_params_2dflat(res, endog_names=yname,
exog_names=xname,
alpha=alpha, use_t=use_t)
else:
raise ValueError('params has to be 1d or 2d')
self.tables.append(table)
[docs]
def add_extra_txt(self, etext):
"""add additional text that will be added at the end in text format
Parameters
----------
etext : list[str]
string with lines that are added to the text output.
"""
self.extra_txt = '\n'.join(etext)
[docs]
def as_text(self):
"""return tables as string
Returns
-------
txt : str
summary tables and extra text as one string
"""
txt = summary_return(self.tables, return_fmt='text')
if self.extra_txt is not None:
txt = txt + '\n\n' + self.extra_txt
return txt
[docs]
def as_latex(self):
"""return tables as string
Returns
-------
latex : str
summary tables and extra text as string of Latex
Notes
-----
This currently merges tables with different number of columns.
It is recommended to use `as_latex_tabular` directly on the individual
tables.
"""
latex = summary_return(self.tables, return_fmt='latex')
if self.extra_txt is not None:
latex = latex + '\n\n' + self.extra_txt.replace('\n', ' \\newline\n ')
return latex
[docs]
def as_csv(self):
"""return tables as string
Returns
-------
csv : str
concatenated summary tables in comma delimited format
"""
csv = summary_return(self.tables, return_fmt='csv')
if self.extra_txt is not None:
csv = csv + '\n\n' + self.extra_txt
return csv
[docs]
def as_html(self):
"""return tables as string
Returns
-------
html : str
concatenated summary tables in HTML format
"""
html = summary_return(self.tables, return_fmt='html')
if self.extra_txt is not None:
html = html + '<br/><br/>' + self.extra_txt.replace('\n', '<br/>')
return html
Last update:
Oct 03, 2024