MATLAB Answers

Beginner: How to get age-adjusted Z scores of a variable?

27 views (last 30 days)
Hi Everyone,
I have a 25 (subjects) x 68 (variables) matrix. I also have a variable called Age (25 x 1). Now, I would like to get the age-adjusted values of the 68 variables. Could someone teach me how to do that please?
Thanks very much!
  2 Comments
ShaneS
ShaneS on 29 Jul 2017
Hi there,
Thanks. What I am trying to do is to get use MATLAB to get the age-adjusted values of the raw data.
Following that, I will like to transform into Z scores against the mean and SDs from another group.
Thanks for your time.

Sign in to comment.

Accepted Answer

Shruti Shivaramakrishnan
Shruti Shivaramakrishnan on 31 Jul 2017
I think the following explanation should help:
zscore(X,flag,dim)
If flag is 0 (default), then zscore scales X using the sample standard deviation...
If flag is 1, then zscore scales X using the population standard deviation
zscore(X,flag,dim) standardizes X along dimension dim
Also, if you would like to use zscore functionality without the Statistics and Machine Learning Toolbox, the following answers discussion might help: https://www.mathworks.com/matlabcentral/newsreader/view_thread/275744
Also the "bsxfun" function can help you combine the two functionalities with bsxfun(@rdivide, bsxfun(@minus, Data, meanvalue), standard deviation value)
mean can be calculated using the "mean" function and standard deviation using "std"

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!