Due Date10/20/05
PM 536
Lab 7: Measuring Impact
In this and the remaining labs you will be conducting analysis to determine the
impact of an intervention. In each case you’ll conduct some scale construction,
preliminary analysis, and then determine impact. In this lab, use the panel02
dataset.
1. Factor analyze the nutrition scale items q1 to q14 at baseline and then at
follow-up. Report the number of factors that should be retained for each;
and what items correspond to which factors and how they should be
labeled. Create the variable(s).
2. Create a knowledge index for both baseline and follow-up datasets, factor
analyze the items and report the number of factors that should be retained
for each; and what items correspond to which factors and how they should
be labeled. Create the variable(s).
3. Did attitude and/or knowledge increase significantly between baseline and
follow-up (hint: create difference scores for the mean of the attitude items
and then the mean for the knowledge items)? Report the scores and
outcomes.
4. Did attitude and/or knowledge increase significantly more for those in the
treatment classes? There is a variable “condit” that indicates whether the
respondent was in a control (=0) or treatment class (=1). Report the scores
and outcomes.
5. Was the change in attitude and/or knowledge the same for both men and
women? Was the program equally effective for men and women? (Hint:
conduct separate ttests or analysis for men and women). Report, in a table,
the statistical results.
6. Determine whether the intervention was effective while controlling for sex,
and ethnicity? What influence did seeing a flyer at follow-up have on
nutrition attitudes and knowledge? Report your results.
