topic Re: univariate and correlated distribution in SAS/IML Software and Matrix Computations

univariate and correlated distribution

dustychair — Mon, 12 May 2014 01:34:12 GMT

Hello,

Could anyone explain me how to generate two bivariates and correlated normal distributions with 5000 sample size?

Re: univariate and correlated distribution

Rick_SAS — Mon, 12 May 2014 13:04:22 GMT

Can you say more? The title of your post says "univariate and correlated," but your message says "two bivariates," so I am confused. Are you trying to generate X from a multivariate normal and then generate a binary response based on the X variables? Such as simulated data from a logistic model?

You can use the RANDNORMAL function to generate correlated normal data. For example:

proc iml;

call randseed(1);

N = 5000; /* sample size */

Mean = {1 2}; /* mean of population */

Cov = {2.4 3, 3 8.1};/* covariance of population */

x = RandNormal( N, Mean, Cov );

Re: univariate and correlated distribution

Rick_SAS — Tue, 13 May 2014 17:37:03 GMT

I am sorry, but I do not understand. The RMSE of WHAT goes down? As you know, you can generate binary variables as 0/1 or as 1/0. What do you observe if you let p --> 1-p? In your program, that would correspond to

z[i,j] = (p<=u);