MannWhitneyU(y, x, c1=None, c0=None, match=None, sub=None, ds=None, tail=0, continuity=True)¶
Mann-Whitney U-test (non-parametric independent measures test)
The test data can be specified in two forms:
In long form, with
ysupplying the data,
xspecifying condition for each case.
xsupplying data for the two conditions.
y (Var) – Dependent variable. Alternatively, the first of two variables that are compared.
x (categorial) – Model containing the cells which should be compared. Alternatively, the second of two varaibles that are compared.
c1 (str | tuple | None) – Test condition (cell of
c0can be omitted if
xonly contains two cells, in which case cells will be used in alphabetical order.
c0 (str | tuple | None) – Control condition (cell of
match (categorial) – Units within which measurements are related (e.g. ‘subject’ in a within-subject comparison). If match is unspecified, it is assumed that
xare two measurements with matched cases.
sub (index-array) – Perform the test with a subset of the data.
ds (Dataset) – If a Dataset is specified, all data-objects can be specified as names of Dataset variables.
tail (0 | 1 | -1) – Which tail of the t-distribution to consider: 0: both (two-tailed, default); 1: upper tail (one-tailed); -1: lower tail (one-tailed).
continuity (bool) – Continuity correction (default