Get Answer: Dataset Dataset Will Question Guide
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Original Question
Dataset: The dataset you will use is named HW1SHHS.sas7bdat. It includes a subset of data from male participants in Scottish Heart Health Study and was obtained from the website associated with Epidemiology: Study Design and Data Analysis, 3rd Edition by Mark Woodward, PhD, published by CRC Press, copyright 2014. The data dictionary is below. Variable name Description Age Age at baseline in years BMI Body mass index at baseline in kg/m2 CHD Indicator for coronary heart disease events during follow-up: 0 = no, 1 = yes Cholesterol Total cholesterol at baseline in mmol/L PhysAct Physical activity at baseline: 1 = active, 2 = average, 3 = inactive Smoking Cigarette smoking at baseline: 1 = never, 2 = past, 3 = current Survival_time Follow-up to time in days Question 1 (5 points). The Scottish Heart Health Study recruited men aged 40-59 from patient lists from general practitioners (family doctors) in 1986. Coronary heart disease events that occurred after study enrollment were detected through centralized databases of hospital records. What study design did the Scottish Heart Health Study use? Question 2 (5 points). Check for missing or possibly erroneous values in HW1SHHS.sas7bdat. Please answer questions 2a and 2b below. 2a) How many missing values are there for each variable? 2b) Do you see any values that are possibly erroneous? Question 3 (20 points). Calculate and interpret the mean, standard deviation, standard error, and 95% confidence interval for baseline body mass index (BMI). Remember, units are important for interpretation. Mean: Standard deviation: Standard error: 95% confidence interval: Question 4 (5 points). To describe the distribution of BMI in this population, which value is used: the standard error or the standard deviation? Question 5 (15 points). Using the variable for physical activity, calculate and interpret the proportion of participants that are considered physically active, the standard error, and 95% confidence interval. Proportion: Standard error: 95% confidence interval: Question 6 (15 points). Calculate and interpret the rate and 95% confidence interval for coronary heart disease events. Please show your work. Rate: 95% confidence interval: Question 7 (5 points). Produce a histogram, box and whisker plot, and quantile-quantile plot for total cholesterol. Please paste or take a screenshot of the figures and include them below: Question 8 (10 points). 2 or more categories of total cholesterol. Please create a table showing the categories you used (i.e., the cholesterol values) and the frequency and percent of observations in each category. (Note: there are many possible answers for this and the following question.) Question 9 (10 points). describe why you chose these thresholds for categorizing total cholesterol. Question 10 (10 points). Paste all SAS code used to complete this assignment below. Please make sure to annotate your code. There is no need to include output or log files.
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