statsmodels.graphics.gofplots.qqline

statsmodels.graphics.gofplots.qqline(ax, line, x=None, y=None, dist=None, fmt='r-')

Plot a reference line for a qqplot.

Parameters:

• ax (matplotlib axes instance) – The axes on which to plot the line
• line (str {'45','r','s','q'}) –

  Options for the reference line to which the data is compared.:

  • ‘45’ - 45-degree line

  • ’s‘ - standardized line, the expected order statistics are scaled by

    the standard deviation of the given sample and have the mean added to them

  • ’r’ - A regression line is fit
  • ’q’ - A line is fit through the quartiles.
  • None - By default no reference line is added to the plot.
• x (array) – X data for plot. Not needed if line is ‘45’.
• y (array) – Y data for plot. Not needed if line is ‘45’.
• dist (scipy.stats.distribution) – A scipy.stats distribution, needed if line is ‘q’.

Notes

There is no return value. The line is plotted on the given ax.