eelbrain.test.WilcoxonSignedRank

class eelbrain.test.WilcoxonSignedRank(y, x, c1=None, c0=None, match=None, sub=None, data=None, tail=0, zero_method='wilcox', correction=False)

Wilcoxon signed-rank test (non-parametric related measures test)

The test data can be specified in two forms:

In long form, with y supplying the data, x specifying condition for each case and match determining which cases are related.

In wide/repeated measures form, with y and x both supplying data with matching case order.

Parameters:

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 x). c1 and c0 can be omitted if x only contains two cells, in which case cells will be used in alphabetical order.
c0 (str | tuple | None) – Control condition (cell of x).
match (categorial) – Units within which measurements are related (e.g. ‘subject’ in a within-subject comparison). If match is unspecified, it is assumed that y and x are two measurements with matched cases.
sub (index-array) – Perform the test with a subset of the data.
data (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).
zero_method (str) – How to handle zero differences (see scipy.stats.wilcoxon()).
correction (bool) – Continuity correction (default False).

Variables:

w (float) – Rank sum statistic.
p (float) – P-value.
tail (0 | 1 | -1) – Tailedness of the p value.
difference (Var) – Difference values.
c1_mean (float) – Mean of condition c1.
c0_mean (float) – Mean of condition c0.

eelbrain.test.WilcoxonSignedRank

Methods