IBM SPSS COMPLEX SAMPLES 19 Water System User Manual


 
85
Complex Samples Cox Regression
Hypothesis Tests
Figure 12-9
Cox Regression dialog box, Hypothesis Tests tab
Test Statistic. This group allows you to select the type of statistic used for testing hypotheses. You
can choose between F,adjustedF, chi-square, and adjusted chi-square.
Sampling Degrees of Freedom. This group gives you control over the sampling design degrees of
freedomusedtocomputep values for all test statistics. If based on the sampling design, the value
is the difference between the number of primary sampling units and the number of strata in the
rst stage of sampling. Alternatively, you can set a custom degrees of freedom by specifying a
positive integer.
Adjustment for Multiple Comparisons. When performing hypothesis tests with multiple contrasts,
the overall signicance level can be adjusted from the signicance levels for the included
contrasts. This group allows you to choose the adjustment method.
Least significant difference. This method does not control the overall probability of rejecting
the hypotheses that some linear contrasts are different from the null hypothesis values.
Sequential Sidak. This is a sequentially step-down rejective Sidak procedure that is much
less conservative in terms of rejecting individual hypotheses but maintains the same overall
signicance level.