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Id variables and number of classes |
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Yemi posted on Saturday, November 13, 2010 - 8:43 pm
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I have three quick questions: I have an id variable that goes from 6-9 digits. However for anything over 8 digits, the id number is rounded, and my id is no longer unique. Can I increase the format of my id number in the save variables command and how do I do that? Secondly: I am running a latent class model with covariates. The number of individuals in each class changes with the number of covariates I add, as does the slope of the classes when I look at the graphs. I am just wondering the intuition behind this. Thirdly, is it possible to control for individuals that belong to the same household (clustering) in the latent class model? Thanks. |
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Older versions of the program had a limit on the number of digits for the ID variable. When the addition of covariates changes the classes, this may point to a need for direct effects from the covariates to the latent class indicators. See the following paper which is available on the website: Muthén, B. (2004). Latent variable analysis: Growth mixture modeling and related techniques for longitudinal data. In D. Kaplan (ed.), Handbook of quantitative methodology for the social sciences (pp. 345-368). Newbury Park, CA: Sage Publications. Related to multilevel latent class analysis see the following paper which is available on the website: Henry, K. & Muthén, B. (2010). Multilevel latent class analysis: An application of adolescent smoking typologies with individual and contextual predictors. Structural Equation Modeling, 17, 193-215. |
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Hello. I have a question about saving the ID variable. I have run a LCA and I want to save the conditional probabilities for classes. I specified the following command: SAVEDATA: FILE = Classes.dat; MISSFLAG=-99; SAVE = CPROB; Additionally, in the VARIABLE section, I specified IDVARIABLE = V1; However, when I run this, I get the following error: *** ERROR The number of observations is 0. Check your data and format statement. Data file: Q1.02.02-15.MISS-99.dat *** ERROR Invalid symbol in data file: "Ôªø126" at record #: 1, field #: 1 The data saves, but without an ID variable. I have checked the data, and the data is fine. The identifier variable ranges from 126 to 90,000. I tried recoding the identifier variable to all be four digits and this didn't seem to chance anything. I would love some help here, as I can't use the saved data without being matched to identifiers. Thank you! |
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Open the data set in the Mplus Editor. You will see that character at the beginning of the data set. Delete it and resave the data. |
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C. Gantz posted on Tuesday, February 03, 2015 - 7:24 am
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Dear Linda, Thank you for your quick response. When I go into MPLUS editor and use the open command, I only have the option to open input or output files. Perhaps this is because I am using the MPLUS editor in a Mac. But it doesn't appear I can open the data in MPLUS editor. Do you have any other suggestions? Best wishes, Caitlin |
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You can open the data file with any Mac text editor. |
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C. Gantz posted on Wednesday, February 04, 2015 - 1:04 pm
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Dear Linda, Thank you, that did the trick! One other reader question: I asked for a graph, which came out in a .gh5 format. From what I have read, this is an R file - does this mean I need the program R to open this file, or is there another way? I am working on a Mac. Best, Caitlin |
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You have to use R. Our website has R plotting examples. |
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