# statsmodels.stats.contingency_tables.StratifiedTable¶

class statsmodels.stats.contingency_tables.StratifiedTable(tables, shift_zeros=False)[source]

Analyses for a collection of 2x2 contingency tables.

Such a collection may arise by stratifying a single 2x2 table with respect to another factor. This class implements the ‘Cochran-Mantel-Haenszel’ and ‘Breslow-Day’ procedures for analyzing collections of 2x2 contingency tables.

Parameters

tables (list or ndarray) – Either a list containing several 2x2 contingency tables, or a 2x2xk ndarray in which each slice along the third axis is a 2x2 contingency table.

logodds_pooled[source]

An estimate of the pooled log odds ratio. This is the Mantel-Haenszel estimate of an odds ratio that is common to all the tables.

Type

float

logodds_pooled_se[source]

The estimated standard error of the pooled log odds ratio, following Robins, Breslow and Greenland (Biometrics 42:311-323).

Type

float

oddsratio_pooled[source]

An estimate of the pooled odds ratio. This is the Mantel-Haenszel estimate of an odds ratio that is common to all tables.

Type

float

riskratio_pooled[source]

An estimate of the pooled risk ratio. This is an estimate of a risk ratio that is common to all the tables.

Type

float

risk_pooled[source]

Same as riskratio_pooled, deprecated.

Type

float

Notes

This results are based on a sampling model in which the units are independent both within and between strata.

Methods

 from_data(var1, var2, strata, data) Construct a StratifiedTable object from data. Returns the logarithm of the pooled odds ratio. logodds_pooled_confint([alpha, method]) A confidence interval for the pooled log odds ratio. The pooled odds ratio. oddsratio_pooled_confint([alpha, method]) A confidence interval for the pooled odds ratio. summary([alpha, float_format, method]) A summary of all the main results. test_equal_odds([adjust]) Test that all odds ratios are identical. test_null_odds([correction]) Test that all tables have odds ratio equal to 1.