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Started by hongqiang liu
Mon, 17 Aug 2009 12:36
multiple imputation _ factor scores
Author: hongqiang liu
Date: Mon, 17 Aug 2009 12:36
Date: Mon, 17 Aug 2009 12:36
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2952 bytes
Dear All, This is to ask for your professional advice on obtaining factor scores after multiple imputation of missing values. When I tried to get factor scores in a factor analysis after Multiple Imputation, I encounter a problem. SAS manual (SAS, 2008, PP. 937) provides detailed explanations on how to get factor scores with the following SAS statements. proc calis data=raw outstat=ostat; lineqs v1 = a1 f1 + e1, v2 = a2 f1 + e2, v3 = a3 f1 + e3; std f1 = 1., e1-e3 = evar1-evar3; run; proc score data=raw score=ostat out=scores; run; but the OUTSTAT in my factor analysis included five sets of relevant variables because of Multiple imputation. Consequently, five factor scores will be produced, which are not so practical if used as index my further analysis. When I searched the network, I also found another way to do the factor analysis after multiple imputation with Proc Calis with the following statements: proc calis data=esteem method=ml cov privec pcoves outstat=ostat; var = s1-s4; lineqs s1 = 1.0 f1 + e1, s2 = lam2 f1 + e2, s3 = lam3 f1 + e3, s4 = lam4 f1 + e4; std f1 = ph1, e1-e4 = th1 th2 th3 th4; cov e2 e4 = th5; by _imputation_; ods output Estimates=a covmat=b; run; proc mianalyze parms=a covb=b ; modeleffects lam2 lam3 lam4 ph1 th1 th2 th3 th4 th5; run; The predicted parameters generated by the above PROC MIANALYZE can be used to produce FACTOR SCORES. But I donβt think they are the best solution, especially, when I have to do multiple multilevel data factor analysis. So, I am wondering if you could give me a more practical solution so that factor scores can be worked out with the PROC SCORE statements? Thanks and best regards! LHQ
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