Proc LCA

yuhhwa — Tue, 06 Nov 2018 11:48:48 GMT

①please tell me the case of following ERROR

ERROR: A problem occured during model estimation. Diagnostic information is as follows:

Matrix not positive definite

OCCURRED IN: cholesky_in_place in MOD logit_model

Logistic regression failed at iteration 1

-Hessian not positive definite.

OCCURRED IN: run_logit_model_threads in MOD logit_model

Could not fit logit model. The problem occurred in:

Group: 1.

OCCURRED IN: mstep_beta in MOD estimation

M-step for BETA failed at iteration 1.

Could not fit logit model. We suggest

using the BETA PRIOR statement.

OCCURRED IN: run_em_modelfit in MOD estimation

②for example, when I want to incorporate all of the following variables,proc lca program is right?

House number Customer number employer number sex height(cm) weight(kg) product 　　year period

112　　　　　　　　　 1 　　　　　　LO2113 　　1 　　161 　　58 　　　 A0001 2018 3

112　　　　　　　　 2 　　　　　　 LO2223 　　2 　　140 　　60　　　 A0002 2017 4

113 　　　　　　　　　3 　　　　　　LO2113 　　1 　　131 　　73 　　　 A0001 2013 2

113 　　　　　　　　　4 　　　　　　LO2113 2 170 121 A0003 2014 6

221 　　　　　　　　　5 　　　　　　LO2004 2 121 48 A0002 2015 7

222 　　　　　　　　　6 　　　　　　LO2113 2 135 50 A0002 2017 8

223 　　　　　　　　　7 　　　　　　LO2113 2 140 . A0002 2016 1

PROC LCA DATA=out OUTPARAM=param1 OUTPOST=post1 OUTEST=est1 OUTSTDERR=stderr1;

NCLASS 5;

id employer number;

item sex;

CATEGORIES 2;

COVARIATES height weight year period;

clusters house number ;

NSTARTS 50;

RHO PRIOR=1;

SEED 1000;

RUN;

id：Is multile variables is available?

2. when I want to standarize, would I better to use not covariates statement,but weight statement?

3. what statement do I use to incorporate product variables?

Re: Proc LCA

hhh2 — Tue, 30 Aug 2022 08:20:07 GMT

Have you solved this problem please? I also encountered this situation

Re: Proc LCA

Cynthia_sas — Tue, 30 Aug 2022 12:30:21 GMT

Hi:
These procedures (LCA and LTA) are discussed here: https://support.sas.com/kb/30/623.html with a link to the documentation. Perhaps you'll find something relevant in the documentation on this issue.
Cynthia

Re: Proc LCA

hhh2 — Tue, 30 Aug 2022 13:02:59 GMT

Thank you very much!

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