arviz.plot_pair#

arviz.plot_pair(data, group='posterior', var_names: Optional[List[str]] = None, filter_vars: Optional[str] = None, combine_dims=None, coords=None, marginals=False, figsize=None, textsize=None, kind: Union[str, List[str]] = 'scatter', gridsize='auto', contour: Optional[bool] = None, plot_kwargs=None, fill_last=False, divergences=False, colorbar=False, labeller=None, ax=None, divergences_kwargs=None, scatter_kwargs=None, kde_kwargs=None, hexbin_kwargs=None, backend=None, backend_kwargs=None, marginal_kwargs=None, point_estimate=None, point_estimate_kwargs=None, point_estimate_marker_kwargs=None, reference_values=None, reference_values_kwargs=None, show=None)[source]#

Plot a scatter, kde and/or hexbin matrix with (optional) marginals on the diagonal.

Parameters

data: obj: Any object that can be converted to an arviz.InferenceData object. Refer to documentation of arviz.convert_to_dataset() for details
group: str, optional: Specifies which InferenceData group should be plotted. Defaults to ‘posterior’.
var_names: list of variable names, optional: Variables to be plotted, if None all variable are plotted. Prefix the variables by ~ when you want to exclude them from the plot.
filter_vars: {None, “like”, “regex”}, optional, default=None: If None (default), interpret var_names as the real variables names. If “like”, interpret var_names as substrings of the real variables names. If “regex”, interpret var_names as regular expressions on the real variables names. A la pandas.filter.
combine_dimsset_like of str, optional: List of dimensions to reduce. Defaults to reducing only the “chain” and “draw” dimensions. See the this section for usage examples.
coords: mapping, optional: Coordinates of var_names to be plotted. Passed to xarray.Dataset.sel().
marginals: bool, optional: If True pairplot will include marginal distributions for every variable
figsize: figure size tuple: If None, size is (8 + numvars, 8 + numvars)
textsize: int: Text size for labels. If None it will be autoscaled based on figsize.
kindstr or List[str]: Type of plot to display (scatter, kde and/or hexbin)
gridsize: int or (int, int), optional: Only works for kind=hexbin. The number of hexagons in the x-direction. The corresponding number of hexagons in the y-direction is chosen such that the hexagons are approximately regular. Alternatively, gridsize can be a tuple with two elements specifying the number of hexagons in the x-direction and the y-direction.
contourbool, optional, deprecated, Defaults to True.: If True plot the 2D KDE using contours, otherwise plot a smooth 2D KDE. Defaults to True. Note: this default is implemented in the body of the code, not in argument processing.
fill_lastbool: If True fill the last contour of the 2D KDE plot. Defaults to True.
divergences: Boolean: If True divergences will be plotted in a different color, only if group is either ‘prior’ or ‘posterior’.
colorbar: bool: If True a colorbar will be included as part of the plot (Defaults to False). Only works when kind=hexbin
labellerlabeller instance, optional: Class providing the method make_label_vert to generate the labels in the plot. Read the Label guide for more details and usage examples.
ax: axes, optional: Matplotlib axes or bokeh figures.
divergences_kwargs: dicts, optional: Additional keywords passed to matplotlib.axes.Axes.scatter() for divergences
scatter_kwargs:: Additional keywords passed to matplotlib.axes.Axes.plot() when using scatter kind
kde_kwargs: dict, optional: Additional keywords passed to arviz.plot_kde() when using kde kind
hexbin_kwargs: dict, optional: Additional keywords passed to matplotlib.axes.Axes.hexbin() when using hexbin kind
backend: str, optional: Select plotting backend {“matplotlib”,”bokeh”}. Default “matplotlib”.
backend_kwargs: bool, optional: These are kwargs specific to the backend being used, passed to matplotlib.pyplot.subplots() or bokeh.plotting.figure().
marginal_kwargs: dict, optional: Additional keywords passed to arviz.plot_dist(), modifying the marginal distributions plotted in the diagonal.
point_estimate: str, optional: Select point estimate from ‘mean’, ‘mode’ or ‘median’. The point estimate will be plotted using a scatter marker and vertical/horizontal lines.
point_estimate_kwargs: dict, optional: Additional keywords passed to matplotlib.axes.Axes.axvline(), matplotlib.axes.Axes.axhline() (matplotlib) or bokeh.models.Span (bokeh)
point_estimate_marker_kwargs: dict, optional: Additional keywords passed to matplotlib.axes.Axes.scatter() or bokeh.plotting.Figure.square() in point estimate plot. Not available in bokeh
reference_values: dict, optional: Reference values for the plotted variables. The Reference values will be plotted using a scatter marker
reference_values_kwargs: dict, optional: Additional keywords passed to matplotlib.axes.Axes.plot() or bokeh.plotting.Figure.circle() in reference values plot
show: bool, optional: Call backend show function.

Returns

axes: matplotlib axes or bokeh figures

Examples

KDE Pair Plot

>>> import arviz as az
>>> centered = az.load_arviz_data('centered_eight')
>>> coords = {'school': ['Choate', 'Deerfield']}
>>> az.plot_pair(centered,
>>>             var_names=['theta', 'mu', 'tau'],
>>>             kind='kde',
>>>             coords=coords,
>>>             divergences=True,
>>>             textsize=18)

Hexbin pair plot

>>> az.plot_pair(centered,
>>>             var_names=['theta', 'mu'],
>>>             coords=coords,
>>>             textsize=18,
>>>             kind='hexbin')

Pair plot showing divergences and select variables with regular expressions

>>> az.plot_pair(centered,
...             var_names=['^t', 'mu'],
...             filter_vars="regex",
...             coords=coords,
...             divergences=True,
...             textsize=18)