Grouped by "bar", probability: 0.011000
For group "Foo", the group means is: -1.439800
The info is: [('mean', -1.4398), ('std', 1.3184)]
For group "Bar", the group means is: 5.958900
Cannot calculate the first difference with a window of size (3).
The info is: [('mean', 5.9589), ('std', 2.7942)]
