How to specify order-restricted test for 3 groups with PROC PLM

anguye11 — Fri, 16 Jul 2021 13:32:16 GMT

Hi all,

I need to conduct a 3-group comparison where the alternative hypothesis is order-restricted: A > B > C.

This test is unlike a traditional F-test where the alternative is A ≠ B ≠ C. I read from Vanbrabrant, 2014 (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4292225/), order-restricted tests can be accomplished using PROC PLM but I could not find the right example in the PLM documentation. I believe I need to use the UPPERTAILED or LOWERTAILED option of LSESTIMATE but I'm not certain how to specify the contrasts -

proc plm restore=mymodel;
lsestimate group 1 0 -1 / ftest uppertailed;

I think the above is comparing A > C but not A > B > C ?

Thank you for your help,

Anthony

topic How to specify order-restricted test for 3 groups with PROC PLM in Statistical Procedures

How to specify order-restricted test for 3 groups with PROC PLM