statsmodels.stats.contingency_tables.SquareTable.test_ordinal_association¶
- SquareTable.test_ordinal_association(row_scores=None, col_scores=None)¶
Assess independence between two ordinal variables.
This is the ‘linear by linear’ association test, which uses weights or scores to target the test to have more power against ordered alternatives.
- Parameters:
- row_scoresarray_like
An array of numeric row scores
- col_scoresarray_like
An array of numeric column scores
- Returns:
Abunchwiththefollowingattributes:- statistic
float The test statistic.
- null_mean
float The expected value of the test statistic under the null hypothesis.
- null_sd
float The standard deviation of the test statistic under the null hypothesis.
- zscore
float The Z-score for the test statistic.
- pvalue
float The p-value for the test.
Notes
The scores define the trend to which the test is most sensitive.
Using the default row and column scores gives the Cochran-Armitage trend test.