get RMSE using linear fit (slope=1 / intercept=0)

[chrisgo]

I want to get RMSE of a correlation plot vs. a linear fit  with slope=1 / intercept=0.

JMP can do it, but its hard if I'm using lots of by groups.

Below is the example using JMP

Thanks!

[gergely_batho · Accepted solution]

proc sort data=sashelp.class out=class;by sex;run;

proc reg data=class;

  by sex;

  model weight=height / noint;

  restrict height=1;

run;

quit;

[chrisgo]

thanks!