statsmodels.graphics.gofplots.ProbPlot.qqplot

ProbPlot.qqplot(xlabel=None, ylabel=None, line=None, other=None, ax=None, **plotkwargs)

Q-Q plot of the quantiles of x versus the quantiles/ppf of a distribution or the quantiles of another ProbPlot instance.

Parameters:

xlabel, ylabel : str or None, optional

User-provided lables for the x-axis and y-axis. If None (default), other values are used depending on the status of the kwarg other.

line : str {‘45’, ‘s’, ‘r’, q’} or None, optional

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.

other : ProbPlot instance, array-like, or None, optional

If provided, the sample quantiles of this ProbPlot instance are plotted against the sample quantiles of the other ProbPlot instance. If an array-like object is provided, it will be turned into a ProbPlot instance using default parameters. If not provided (default), the theoretical quantiles are used.

ax : Matplotlib AxesSubplot instance, optional

If given, this subplot is used to plot in instead of a new figure being created.

**plotkwargs : additional matplotlib arguments to be passed to the

plot command.

Returns:

fig : Matplotlib figure instance

If ax is None, the created figure. Otherwise the figure to which ax is connected.