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TTF is a logical format. The standard setting is NTTF (false).

TTF causes F-tests (or t-tests) and probabilities to be computed on any table with mean scores (or averages).

Note that format SHG controls the output from TTF.

Under SHG0 paired t-tests will be calculated.

Under SHG1 to SHG3 a single F-test is calculated within each header group.

See also formats:

AVG Averages or mean scores

ESS Effective sample sizes in statistics calculations

SHG Statistics Header Group

PRO Probabilities

TTT T Tests on Tables

TTV T Tests Variance used in formula