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Anonymous posted on Thursday, April 15, 2004 - 11:35 am
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Is it in any way possible to run a stepwise regression on the between-level of a two-level model in mPlus? For example, I have six observed independent variables (I will specify measurement error in each of these), and one latent dependent variable. I would first like to see to what extent five of the independent variables explain variance in the dependent variable, and then add a sixth independent variable to see if it adds anything to the prediction. I read a paper by deJong (1999) about Cholesky factoring and phantom factors. Is it possible to use this procedure in mPlus? I would appreciate any suggestions. |
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bmuthen posted on Thursday, April 15, 2004 - 11:42 am
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Mplus does not provide stepwise regression. You can do Cholesky factoring with phantom factors in a latent variable framework such as Mplus. |
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Anonymous posted on Friday, July 16, 2004 - 2:12 am
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I have tried to run a Cholesky factoring with phantom factors (as described in deJong, 1999) without success. Could you please see whether there is anything wrong in the syntax I have specified below? I get an error message that there are insufficient data in the data file, but the file functions well doing regular regression. Another question: Bentler & Satorra has an alternative approach, where one use residuals as predictors in equations. Is this possible in mPlus? I am very grateful for all your help. TITLE: CHOLESKY DATA: FILE IS cholesky.DAT; TYPE IS CORRELATION STDEVIATIONS; NOBSERVATIONS ARE 95; VARIABLE: NAMES ARE v1-v12 PH1 PH2 PH3 PH4; MODEL: AW BY V1-V3; SYN BY V4-V6; SRN BY V7-V8; NI BY V9-V11; WORDREC BY V12@1; V12@0; PH1@1; PH2@1; PH3@1; PH4@1; PH1 ON NI AW SYN SRN; PH2 ON AW SYN SRN; PH3 ON SYN SRN; PH4 ON SRN; AW@0; SYN@0; SRN@0; NI@0; PH1 WITH PH2@0 PH3@0 PH4@0; PH2 WITH PH3@0 PH4@0; PH3 WITH PH4@0; WORDREC ON PH1 PH2 PH3 PH4; OUTPUT: STAND; |
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Anonymous posted on Friday, July 16, 2004 - 3:13 am
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I just noticed an error in the VARIABLES part of the syntax I sent you, it should be: VARIABLE: NAMES ARE v1-v12; USEVARIABLES v1-v12 ph1 ph2 ph3 ph4; However, it still is not accepted, and the problem seem to be to get the program to accept phantom factors without indicators. Thanks for any suggestions about this. |
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Please send your input and data to support@statmodel.com. |
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Anonymous posted on Friday, July 16, 2004 - 8:34 am
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Following is the model modification you need. Tihomir ----- MODEL: AW BY V1-V3; SYN BY V4-V6; SRN BY V7-V8; NI BY V9-V11; WORDREC BY V12@1; V12@0; PH1@1; PH2@1; PH3@1; PH4@1; PH1 BY NI* AW SYN SRN; PH2 BY AW* SYN SRN; PH3 BY SYN* SRN; PH4 BY SRN*; AW@0; SYN@0; SRN@0; NI@0; PH1 WITH PH2@0 PH3@0 PH4@0; PH2 WITH PH3@0 PH4@0; PH3 WITH PH4@0; WORDREC ON PH1 PH2 PH3 PH4; |
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melissa posted on Monday, June 18, 2007 - 9:37 am
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Hello, Back in 2004, you mentioned that Mplus does not provide stepwise regression (see April 15, 2004 - 11:42 am above). Is this still the case in 2007? If so, could one simply enter the various "blocks" in a series of progressive but separate analyses? Thank you. |
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No, we do not provide stepwise regression in Mplus. I am not sure but I don't think entering the covariates in blocks alone is equivalent to stepwise regression. |
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Hello, how I can request a plot of residuals resulted from simple regression of y ON x? Thank You! |
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If you mean the difference between the predicted and observed values of y, you would need to create this residual in DEFINE and then it could be plotted. |
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This is exact, what I mean! DEFINE: Res = y - (y ON x); ! <- How is the correctly input Thank You! |
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DEFINE: ypred = alpha + beta*x; res = y - ypred; You need to replace alpha and beta with the numbers from your output. |
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Thank You! |
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