Hue option on the seashore FacetGrid

Question

I have a problem with Facetgrid: when I use the tint option, the x-labels appear in the wrong order and do not match the data. Loading the Titanic dataset in ipython:

%matplotlib inline import pandas as pd import matplotlib.pyplot as plt import seaborn as sns titanic = sns.load_dataset("titanic") g = sns.FacetGrid(titanic, col='pclass', hue='survived') g = g.map(sns.swarmplot, 'sex', 'age') 

Facetgrid with a tint:

This shows that there are more women than men, but this is not so.

If now the hue parameter is removed, then I get the correct distribution: in all pclasses there are more men than women.

 g = sns.FacetGrid(titanic, col='pclass') g = g.map(sns.swarmplot, 'sex', 'age') 

Facetgrid no shade:

What's going on here? I am using Seaborn 0.7.0

Answer 1

If you intend to use FacetGrid with one of the categorical building functions, you need to specify order information by declaring the variables as categorical or with the order and hue_order :

 g = sns.FacetGrid(titanic, col='pclass', hue='survived') g = g.map(sns.swarmplot, 'sex', 'age', order=["male", "female"], hue_order=[0, 1]) 

However, as a rule, it is preferable to use factorplot , which will take care of this bookkeeping for you, and also save you when entering text:

 g = sns.factorplot("sex", "age", "survived", col="pclass", data=titanic, kind="swarm")