Seeking help with a homework question: Using the Blood dataset, drop WBC, RBC, and Subject and create a new dataset containing the observation with non-missing cholesterol (var name Chol). Use this dataset to create another dataset that contains the largest cholesterol value for each combination of gender, blood type, and age group. In the same DATA step, using the RETAIN statement, calculate the difference between the smallest and largest cholesterol for each combination of gender, blood type, and age group. Lable the new variables and print this dataset which should look like the following:
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