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EPI 624 Assignment 7 (10 Points) The data in the file Cholest_Measures come from fake participants in a study for cardiovascular disease and high cholesterol. Cholesterol measurements were taken at four different times by trained study staff using a lipid blood panel and recorded. Use the data dictionary below, complete the data rearrangement necessary for analysis, and answer the below questions about the participants in this study. Variables: ID: study ID – participant ID Gender: 1=male, 2=female Diabetes: 1=yes, 2=no Visits: 1, 2, 3, and 4 Cholesterol: total cholesterol Question 1. Use the LIBNAME statement to assign a libref. Download and save the excel data file cholest_measures.xlsx. After importing the data file, save it as a permanent SAS dataset named CH_LONG, stored in the SAS library associated with your libref. [1 point]. Question 2. These data were collected with a new observation (line) for each visit for every participant to record the cholesterol value at that visit. In other words, there are 4 observations per study ID. Using the TRANSPOSE procedure, create a new temporary dataset named “YourInitials_CH_WIDE” that has all 4 cholesterol values on one line for each study ID. (Hint: The dataset is long and needs to be made wide.) The new cholesterol variables should be: Visit_1, Visit_2, Visit_3, Visit_4 [2 points] Question 3. High cholesterol for this study is defined as having a cholesterol greater than or equal to 200 on ANY of the four visits (*think OR). Healthy cholesterol for this study is defined as having a cholesterol less than 200 on ALL four visits (*think AND). Using an IF/THEN statement, create a new binary variable that will identify if each participant is classified as having high cholesterol or not. [2 points] Question 4. Answer the following: A. Number (count) and proportion (%). [1 point]: Those classified as High cholesterol: _______ Those classified as Healthy cholesterol: _______ B. Mean age ± SD [1 point]: Those classified as High cholesterol: _______ Those classified as Healthy cholesterol: _______ C. P-value for testing if there is a difference in age between those with high and healthy cholesterol levels (report to 3 decimal places) [1 point]: p=_______ D. Test used for p-value (Hint: using normality rules) [1 point]:

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