Hi all - I'm new to understanding HLM - does this syntax look right?
Aim --> to determine whether a depression group therapy program
significantly reduces symptoms, and whether there was a significant
group effect - no control group, just one group of outpatients at a
mental health clinic
Data are hierarchically arranged in 3 levels - level 1 = observation
(before treatment, after treatment), observations are nested within
individuals (level 2), individuals are nested within therapy groups
(level 3).
DV is depression symptoms, IV is treatment (within subjects, before and
after), want to model therapy group as a random effect. Just trying to
get a handle on the basic syntax analysis, before I go considering
models with covariates etc.
MIXED
depression BY treatment
/CRITERIA = CIN(95) MXITER(100) MXSTEP(5) SCORING(1)
SINGULAR(0.000000000001) HCONVERGE(0, ABSOLUTE) LCONVERGE(0, ABSOLUTE)
PCONVERGE(0.000001, ABSOLUTE)
/FIXED = treatment | SSTYPE(3)
/METHOD = REML
/PRINT = LMATRIX SOLUTION TESTCOV
/RANDOM = INTERCEPT | SUBJECT(group_num) COVTYPE(ID) .
Are there better ways of specifying this - eg with the /REPEATED
subcommand?
Hunna
Hunna Watson
Research Officer
Centre for Clinical Interventions (CCI)
Department of Health in Western Australia
223 James St
Northbridge WA 6003
Tel: 9227 4399
Fax: 9328 5911
www.cci.health.wa.gov.au
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