You are conducting a study to analyze gender differences in associations between

Question

You are conducting a study to analyze gender differences in associations between neurocognitive impairment (NCI) and cocaine use among high-risk cocaine-depedent methadone-maintained patients. You have found 3 demographic characteristics that produces significant effect on NCI, they are, gender, race, and age:

a) What statistical analysis would you use to see simultaneously the contributions of socio-demographic variables (gender (male/female), race (White, Black, Latino, Asian), and age (in years) on self-reported NCI, a questionnaire that has a minimum of 1 (low NCI) a maximum of 30 (high NCI)?

b) What main procedures (proc) would you use in SAS to answer a) and which ones would you have run to see the individual effects of each variable on NCI?

Explanation / Answer

Part-a

As age is continuous variable , gender and race are nominal variable and NCI is also continuous, so we aill apply Analysis of covariance with NCI as dependent variable, Gender and race as factors and age as covariate

PArt-

SAS proc is as follows:

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