sem

  1. A

    How to do a Factor Mixture Model (R or Python)

    Hello The purpose of my study aims to stratify sensory phenotypes in Autism Spectrum Disorder (ASD). I would like to identify subgroups based on sensory symptoms to understand the heterogeneity of sensory features. To measure sensory symptoms, I use a 38 items parent-report questionnaire...
  2. A

    Moderated Mediation in STATA with SEM

    Hi! I’m in dire need of some urgent help! I’m trying to do a moderated mediation analysis in STATA with the following variables (see also the figure below): IV: Identity - Measured on scale from 1 to 5 DV: Torture Attitudes - Measured on scale from 1 to 7 Mediator: Perceived threat - Measured...
  3. C

    Suspicious about perfect fit in SEM (CFI = 1, RMSEA = 0)

    I'm new to path analysis in SEM and suspicious about my model fit indices in R / lavaan: lavaan 0.6-6 ended normally after 27 iterations Estimator ML Optimization method NLMINB Number of free parameters...
  4. M

    Modified population variance

    I don't understand the term "modified population variance" used in this pdf file:///C:/Users/marya/AppData/Local/Packages/Microsoft.MicrosoftEdge_8wekyb3d8bbwe/TempState/Downloads/RSbook_ch3%20(1).pdf. Is it related to the concept of unbiased estimator of the population variance? Also, why do...
  5. BryceOdell

    [MPlus] Using the Alignment Method with non-invariant factors

    I am attempting to use the Alignment within CFA method from Marsh et al. (2017) on 2015 PISA. However, six out of nine factors have more than 25% non-invariance What can be done to a dataset that is found to be mostly non-invariant using the alignment method? Does this mean than the 6 factors...
  6. R

    How Content Marketing contributes to Purchase Decision (b2b) with SEM

    Hello community, I want to analyze the contribution of content marketing to our sales activities. Suppose we have a website with a lot of content such as videos, downloadables, whitepapers, and so forth. Using that website, we generate leads, which is basically anyone who fills out a form with...
  7. P

    calculating and interpreting SD from mean and SEM

    I have some summary stats on people's drink intake and I'd like to work out the variance. Frustratingly I have no access to the full data set so I'm having to infer the shape as much as possible from a handful of descriptive stats. I have access to the mean amount, the standard error of the...
  8. S

    categorical control variables in SEM using AMOS

    I am trying to build a model in SEM, where 3 categorical demographic variables (education (4 levels), age (5 levels), and gender (2 levels)) should be included as control variables. I plan to use SPSS AMOS. However, upon reading some documentations of AMOS, it seems AMOS can handle categorical...
  9. J

    Dynamic Panel Data for Financial Markets

    Dear all, I am trying to simultaneously estimate three equations using dynamic panel data. In each equation, the dependent variable (say, Y(3)) is a function of the two other dependent variables from that same period (say, X(3) and Z(3)), as well as the lagged values of the same dependent...
  10. H

    Multiple regression multigroup analysis in Amos

    I am testing the hypothesised effect in a model using SEM A -> B between two groups. The results of the standardised path coefficients (SPC) are Group 1: spc = 0.334 p < 0.001; Group 2: spc = 0.316 p = 0.181. I would have expected the effect of group 2 to be also significant although it is...
  11. B

    [STATA - gsem] Multilevel Structural Equation Model - Meta Analysis

    Hello, I am quite familiar with mixed effects (multilevel models) in meta analyses. Now, I want to do a mixed effects (multilevel) meta analysis structural equation model (MASEM) with STATA and the gsem package because my data format is long. My data look like: `id studyId...
  12. S

    Structural Equiation Modeling - Likert variable and fit indices

    Hello everybody! Thank you in advance for reading, and for trying to help! To put it briefly.. I am working with Structural Equiation Modeling (for the first time :S). In this study, we have 1000+ participants and we are studying the relationship between alcohol use and a personality...
  13. P

    Question on Standard Error

    If I need to compute the standard error for a bunch of students' test averages, and there are 20 students, each of whose score is itself an average of 8 tests, will my N for SEM=sdev/SqRt(N) be 20? Or will it be 160? In other words, if my bar graph plots the mean of 20 students' averages, but...
  14. A

    The Best Statistical Analysis Method and How to calculate number of participants

    Hello all! I have a research design : As it can be seen A, B, C are independent variables; D is a mediator and E is the dependent variable. While A and C has an effect on D, B and D has a correlation. In this research - I guess the best way for analyzing is SEM however the...
  15. H

    How to report the results of a complex path analysis in AMOS?

    So, I started with a model with 5 IVs and 7 DVs. This model had a poor fit (RMSEA = 0.405, CFI=0.760 or so). Most of my hypotheses were not confirmed, i.e. many regression coefficients were not significant, so there were no relationships between many variables. Next, I started to prune the...
  16. M

    Categorical data in SEM using AMOS. How can results be interpreted?

    I'm very new in SEM and I'm concerned about the reliability of Bayesian estimation of categorical variable in AMOS; then, if it is reliable, how can I interpret those results? How can I know which category is associated with the outcome in the latent variable? It is assumed that only that...
  17. D

    Seeking help for the interpretation of model fit indices

    Hi everyone... Please help me with the following question I'm doing my research that one of it aims is to test the model fit of a particular model. I'm having a problem to draw the conclusion of the fit of the model since it has various model fit indices that show different result. Below is...
  18. B

    Problems with confirmatory factor analysis in R

    I am trying to teach myself confirmatory factor analysis by working through examples in a textbook. The textbook only contains syntax for LISREL or SAS but I'm trying to learn it with R. When I estimate models without any equality constraints or correlated errors, I get the exact same output as...
  19. S

    R squared in structural equation modeling

    Hello I recently started working with structural equation modeling. I am doing a study for which I tested a model like this: Var1 --> var2--> var3 --> var4. All variables are latent variables and have several indicators. Now, the R² of var3 is +-40% in this case. However, something strange...
  20. P

    Moderating effects in structural equation models

    Hello, first, I want to apologize if I'm opening this thread in the wrong folder etc. I just registered here and I'm a bit confused still. I'm having trouble interpreting moderation effects in a structural equation model. We're regressing antisocial behaviour (four latent factors) on...