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EPID 766: Analysis of Longitudinal Data from ... - NCSU Statistics

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CHAPTER 1 Epid <strong>766</strong>, D. Zhang<br />

Part <strong>of</strong> output <strong>from</strong> above SAS program:<br />

Test equality <strong>of</strong> mean and variance <strong>of</strong> intercepts and slopes between sexes 4<br />

The TTEST Procedure<br />

Variable: b0hat<br />

sex N Mean Std Dev Std Err Minimum Maximum<br />

0 97 224.0 40.2259 4.0843 146.3 348.1<br />

1 103 217.6 42.9885 4.2358 141.1 360.2<br />

Diff (1-2) 6.3629 41.6719 5.8960<br />

sex Method Mean 95% CL Mean Std Dev 95% CL Std Dev<br />

0 224.0 215.9 232.1 40.2259 35.2522 46.8465<br />

1 217.6 209.2 226.0 42.9885 37.8123 49.8197<br />

Diff (1-2) Pooled 6.3629 -5.2640 17.9898 41.6719 37.9405 46.2237<br />

Diff (1-2) Satterthwaite 6.3629 -5.2408 17.9666<br />

Method Variances DF t Value Pr > |t|<br />

Pooled Equal 198 1.08 0.2818<br />

Satterthwaite Unequal 197.99 1.08 0.2809<br />

Equality <strong>of</strong> Variances<br />

Method Num DF Den DF F Value Pr > F<br />

Folded F 102 96 1.14 0.5117<br />

Graduate Summer Session in Epidemiology Slide 40

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