sem

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    R2 in SEM decreases when adding more variables

    In an SEM analysis using SPSS AMOS with 9 latent constructs, I am trying to establish incremental validity between a basic model of 4 constructs and the fully integrated model with 9 constructs. Without going too much into the details here, I discovered that while most fit indices (e.g. CFI...
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    Lisrel: Goodness-of-fit with FIML and missing data

    Hi! When doing a missing-data analysis with FIML in Lisrel, I don't get a lot of goodness-of-fit statistics. I have discovered that you can calculate the fit-indices using the Chi-Square from an independence model. Now the question is first of all, how do I estimate an independence model...
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    [STATISTICA] - Software selection for basic statistical analysis and SEM

    Hello, everyone! I'm new to this forum and I am very excited about this opportunity to learn from experienced people here and (hopefully) share knowledge about statistical analysis. I'm a graduate student pursuing Ph.D. in Information Systems. My dissertation research involves using...
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    [EQS] Unable to run Maximum Likelihood Robust analysis

    Hello everyone, I'm trying to conduct first order CFA on a 50-item instrument. I tried AMOS. However, results suggest that the data is non-normal. I've looked around and it seems the best way to deal with it is to use the SB-X2 correction, available on the EQS software. On EQS however, I can...
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    SEM CFA results in error for longitudinal data

    I am trying to build a longitudinal measurement model of a "strategy construct" using SEM. As long as I am building the model for each year individually, I have no problem and Stata's SEM converges. I use the following code...
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    Multiple comparisons in SEM

    Hello, I am using the Multiple Group Analysis function in AMOS to compare three groups. I am using pairwise comparisons to compare group 1 with groups 2 and 3. Should I be applying a multiple comparisons technique, such as Bonferroni? I am using a maximum likelihood procedure, based on...
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    Calculating Smallest Detectable Difference when mean is around 1 and MSE < 1

    Apologies if this is in the wrong forum, and please move if this is the case (I have also posted this in the Statistical Research forum). Just a query that might be intractable. When calculating Standard Errors of the Measure (SEM's), we take the root of the Mean Square Error of the...
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    Calculating Smallest Detectable Difference when mean is around 1 and MSE < 1

    Apologies if this is in the wrong forum, and please move if this is the case. Just a query that might be intractable. When calculating Standard Errors of the Measure (SEM's), we take the root of the Mean Square Error of the residual (MSE from the ANOVA table), then multiply by 1.96 and by...
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    convergence not achieved in CFA

    Dear forum I am doing factor analysis on a small quality of life questionnaire. It contains only 6 items. I did EFA with parallel analysis in STATA. This revealed a possible 2 factor structure with 4 items in factor 1 and the last two items in factor 2. When I do CFA (SEM) to test this new...
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    CFA and Factor scores from ordered Likert scale items using SEM and Lavaan packages.

    Hello! I'm trying to do some confirmatory factor analysis with for ordered Likert scale items using sem and lavaan packages. So far I have read a lot and searched a lot but working example has so far eluded me. Can someone please take a look at the data and tell me if what I'm doing is correct...
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    Structural Equation Modelling (SEM)

    Hi all! Within my master thesis I have to work with a SEM and I did a horrible mistake. My initial plan was to follow this structure: 1. Hypothesis development 2. Modelling / Operationalization / ... 3. Pretest (one-dimensionality with exploratory factor analysis) 4. Adaptation of items...
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    Path Model (SEM)

    Hello, Can anybody please explain how to interpret the "Path Model" results? In path models the structure is predefined (LV, MV and the Path), If not sure of the path and the grouping of LV and MV is there any way to figure out which MV should be part of a particular LV? Thanks
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    SEM: poor fit, large sample, a lot of DF with significant coefficients.

    I am running an analysis of the influence of gender on a number of performance outcomes. My model is also moderated by the gender of the evaluator. The model has really poor fit (Df=241, N=851 I am looking at RMSEA (default model .309) and Hoelter (.05, Default model =12; .01 Default model...
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    non-parametric t-test with mean/SD = 0

    Hi All, quick question on non-parametric t-test I have 2 groups. 7 values each. Group One= 0, 0, 0, 0, 0, 0, 0 which of course is mean=0 and SEM=0 Group Two= 0, 0, 21, 35, 0, 0, 0 mean=8 and SEM=5.4 When I do unpaired non-parametric Mann-Whitney two-tail test, I am told that because...
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    Moderated Mediation when Independent Variable is also the moderator

    I have a question on a special case of moderated mediation... I want to compare some effect sizes of: a "simple moderation model" with a "moderated mediation model in which the IV is also a moderator". I don't have data yet. But I want to know if the betas (effect sizes) explained in...
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    CFA and SEM goodness fit indices the same?

    I am using AMOS to fit a structural equation model. Before doing so, however, I would like to perform a confirmatory factor analysis, which I have done this by correlating the latent variables. After confirming goodness of fit (using GFI, CFI, RMSEA, etc.), I run the structural model. However...
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    LGC with Experimental Manipulations

    Hey gang, first time posting. So, I have 9 time points of continuous learning data for 200ish people. I also have two manipulations (thus the 200 people are split into four groups, group size is unequal). I also collected several personality measures via questionnaires. I have a little bit...
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    Low factor loadings on latent variable in SEM

    Dear TalkStats, I am fitting a structural equation model and one of the latent variables has 3 out of 5 factor loadings under .60 I heard that this may be a cut off point for legitimate loadings, but I can't find a reference. In any case, both the measurement model and the structural model have...
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    Structural equation modelling - estimate means and intercepts?

    My research question is related to the determinants of organizational commitment, and I am using survey data to estimate a latent variable SEM model in Stata. In AMOS, the default is to not estimate means and intercepts, however, in Stata the default is to estimate both. In my model, indicators...
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    HELP! SEM and path analysis with time frames

    I am having trouble writing the methods section for my dissertation research. I am using SEM/path analysis, and I cannot figure out how to include multilevel analysis for one of my IVs. One of my IVs has 6 levels of time associated with it. The outcome on the DV is being compared between each...