topic Re: How to use proc varcomp when there are effects that reflect two levels of nesting. in Statistical Procedures

How to use proc varcomp when there are effects that reflect two levels of nesting.

Rover17 — Mon, 02 Oct 2023 17:37:35 GMT

Hi All,

I have a question about how to use proc varcomp when there are effects that reflect two levels of nesting.

For my analysis, I have human raters nested in faculty, and faculty nested in departments. You can see my proc varcomp procedure below. SAS reports an error because it doesn't like the term of Rater(Faculty(Department)) in the Model statement . So, I am wondering if I specified the two levels of nesting correctly in the first place.

proc varcomp data = OneDrive.long_&Year._wide_c

method = reml;

class Department Faculty Rater item ;

model Dependent = item Department Faculty(Department) Rater(Faculty(Department)) Department*item / FIXED=1;

run;

title;

Can someone please explain to me how to correct my code?

Could I correct it by replacing the term Rater(Faculty(Department)) with the two terms of Rater(Faculty) and Faculty(Department) instead?

Thank you

Re: How to use proc varcomp when there are effects that reflect two levels of nesting.

sbxkoenk — Mon, 02 Oct 2023 19:54:13 GMT

6.4 - Fully Nested Random Effects Model: Quality Control Example
https://online.stat.psu.edu/stat502_fa21/lesson/6/6.4

You can do this with PROC MIXED or PROC VARCOMP or PROC NESTED.

Koen

Re: How to use proc varcomp when there are effects that reflect two levels of nesting.

StatsMan — Tue, 03 Oct 2023 12:39:30 GMT

You almost had the nesting syntax. For that second level of nesting, you need a(b c) instead of a(b(c)).