You will use the dataset from the National Alzheimer Coordination Center Export the matrix of the row numbers of subjects from question 4 in a dataset called IMPAIRED.Statistics & Analysis

You will use the dataset from the National Alzheimer Coordination Center (NACC) that was used in
exercise 1 but only for the first visit.

Perform the following within proc IML and provide a paper copy of your SAS code only.
1) Read only the following variables into a matrix called CG: NACZZMS, NACCLMI, NACCZLMD, 
NACCDFT, NACCAGEB.
2) Using loops, replace the missing codes 99 and -99 for the following neuropsychological scores: 
NACZZMS, NACCLMI, NACCZLMD and NACCDFT
3) Calculate the mean of the scores: NACZZMS, NACCLMI, NACCZLMD and NACCDFT and name the 
new variable “Cognition”
4) Identify the subjects who have mean cognitive score less than -1.5 (Note: SAS thinks that a missing 
value is equal to –infinity)
5) Export the matrix of the row numbers of subjects from question 4 in a dataset called IMPAIRED.
6) Within IML, run a regression (proc REG) with the “Cognition” as the dependent variable and age as 
the independent variable.

Attachments:

Instructions Files

Statistics & Analysis Experts

expert
Olive F.
Statistics & Analysis

30 Answers

expert
Thomas Albaugh
Statistics & Analysis

47 Answers

View More Experts
Disclaimer

The ready solutions purchased from Library are already used solutions. Please do not submit them directly as it may lead to plagiarism. Once paid, the solution file download link will be sent to your provided email. Please either use them for learning purpose or re-write them in your own language. In case if you haven't get the email, do let us know via chat support.

Get Free Quote!

257 Experts Online