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  1. J

    Clean table of descriptive statistics in R

    Hello, I am migrating to R from Stata. However, I am having much trouble producing a simple, clean table of descriptive statistics. In Stata, I can type: summarize v1 v2 v3 and get a table with variable names in the first column followed by the number of observations, means, sds, and...
  2. J

    Ordered logit or OLS?

    Hi there, I am using survey data and my dependent variable has 5 levels ranging from 'Strongly disagree' to 'Strongly agree.' My understanding is that it is appropriate to use an ordered logit model in this situation, as equal distances can not be assumed to lie between each level of the...
  3. J

    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...
  4. J

    Significant interaction effect?

    I would like to test how how gender interacts with another (continuous) variable. To do this, I am using a hierarchical (nested) regression model. The first model uses the continuous variable and gender as predictors, but only the continuous variable is statistically significant. In the second...
  5. J

    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...
  6. J

    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...
  7. J

    graphing an interaction in Stata

    Hello, I am trying to find the correct way to graph an interaction effect between two continuous variables in Stata. My regression, the code is nestreg: regress y (c1 c2) (x1 x2) (x1_x_x2) with y the outcome variable, c1 and 2 controls, x1 and 2 the independent variables, and x1_x_x2 a...
  8. J

    Appropriateness of logistic regression

    Hello, I am interested in the effects of gender on a set of variables. I have run a number of group mean t tests (with gender as the group variable), and have confirmed that the means for men and women across the different variables are different at statistically significant levels. This...
  9. J

    Create scale (or index) using items that are measured on with different scales

    Hello, I would like to make a scale of several items that are theoretically related, have a >.8 cronbach's alpha, but were measured on different scales themselves. Also, each factor has a different number of items. So, questions 1~3 measured by 1 = very small ~ 5 = very large questions...
  10. J

    Problem fitting an SEM with latent variable

    Hello, I am having trouble with a Structural Equation Model. As you can see in the attached picture, my main outcome variable (F4) is a latent variable. When I run the model, all of the paths are significant in the hypothesized direction, but the Chi-square is very high (almost 10,000) and...
  11. J

    Low cronbach's alpha - any remedy?

    Hi there, I want to construct a scale of 'contacting government' based on the question 'Please indicate if in the past year you contacted govt about any of the following services.' --There is a list of 14 different topics. The factor analysis (result attached) shows what to me what are...
  12. J

    Use of an observed (measured) variable in a structural equation model?

    Hello, Is it possible to include an observed (measured) variable in a structural equation model (SEM)? In different words: Must one only use latent variables in SEM? I have several latent variables, but one variable does not have multiple measures. Nevertheless, if it is technically...