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Anees Pari posted on Thursday, April 07, 2016 - 7:09 am
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Dear Dr.Muthén, Hello there. I am exploring whether generic preference based health related quality of measures are appropriate to use in conjunction with disease specific scales in severe mental illness. I have three individual scales that measure depression, mania and generic quality of life respectively in a cohort of patients. I would like to know whether these instruments measure a common construct/s. All the three scales are unidirectional.To begin with, I ran EFA and found out there a three factor model is appropriate based on parallel plot and loading. However, I notice that some of the items had negative loading on factors. This was the same case for ESEM and CFA. My questions are: a) How to interpret negative loadings on factors b)My sample has got repeated measurements on same individuals (there is no particular periodicity or pattern to their responses; some have sent their responses weekly, some monthly). I would like to use clustered standard errors to adjust for this clustering. In total , i have around 1400 observations on the three scales completed by 100 patients. Is there any way to do this in MPLUS? I am new to MPLUS and factor analyses, and would be grateful for your advice. Many thanks Best wishes Pari |
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a) When the factor value increases the factor indicator (or its probability) decreases. So just like regression. b) You can use Analysis Type=Complex EFA. See UG. |
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Anees Pari posted on Friday, April 08, 2016 - 7:02 am
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Thanks for your prompt response. I tried using the type complex but unable to get a solution and getting the following error Data: File is G:\examples.dat ; variable: Names are subjid item1 item2 item3 item4 item5 item6; USEV=item1 item2 item3 item4 item5 item6; IDVARIABLE =subjid; CLUSTER=subjid; Analysis: Type=COMPLEX EFA 1 2; OUTPUT: SAMPSTAT MODINDICES(10.00) STAND *** ERROR Cluster variable SUBJID has multiple uses. Could you please advice where I am going wrong? |
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Anees Pari posted on Friday, April 08, 2016 - 7:08 am
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Further to my above query, I also tried running a CFA but again getting some errors File is G:\examples.dat ; variable: Names are subjid item1 item2 item3 item4 item5 item6; USEV=item1 item2 item3 item4 item5 item6; IDVARIABLE =subjid; CLUSTER=subjid; Analysis: Type = complex; MODEL: difficulty BY item1 item2 item3; laziness BY item4 item5 item6 ; OUTPUT: SAMPSTAT MODINDICES(10.00) STAND RESIDUAL TECH2; PLOT: TYPE = PLOT1 PLOT2 PLOT3; *** ERROR in VARIABLE command TYPE=COMPLEX requires a cluster variable, a stratification variable or replicate weights. Use the CLUSTER, STRATIFICATION or REPWEIGHTS options to specify one of the requirements for TYPE=COMPLEX. Thanks again for your help Best wishes |
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Subjid can be on either the CLUSTER statement or the IDVARIABLE statement but not both. If you have further error messages, send the output and your license number to support@statmodel.com. |
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