Search results

  1. J

    issue with dependence of observations across models

    Dear all, I have a question regarding an intervention design and statistical analysis related to it. My intervention design has 2 cohorts: per-intervention cohort and the post-intervention cohort. Each cohort has around 1000 people, but around 70% people from the pre-intervention will go to...
  2. J

    Logistic or Poisson regression?

    I have a question about selecting a model: logistic, Poisson or negative binomial regression. I have collected data on offenders’ number of offences (0,1,2,3,4,5) (DV) in the previous year in different correction centres (level 2 as site) and thought about using multilevel Poisson regression...
  3. J

    Compare odds ratios across groups in multilevel modelling

    It has been argued that it is problematic to compare log-odds ratios and odds ratios across samples, across groups (Mood 2010, ‘Logistic Regression: Why We Cannot Do What We Think We Can Do, and What We Can Do About It’), and the possible solution could be to use y-standardisation, average...
  4. J

    restriction on imputed value in MICE

    I have a question about multiple imputation in R using MICE program. How can I put a restriction on the imputed value of a variable (e.g., variable A) smaller than the value of another no missing variable (e.g., variable D)? what is the code? More specifically, if I have a dataset (dataj)...
  5. J

    offset in logistic regression

    Does anyone see any studies using offset in a logistic regression (preferably multilevel logistic regression)? I checked in STATA that it is fine to include offset in a logistic regression model, and Hardin & Hilbe (2001) book, Generalized Linear Models and Extensions, described how to use...
  6. J

    date 100 year different

    I have a date variable in string (var_date) in the spss data file, 2 cases like these: 01-Mar-41 12-May-53 After I changed string into date variable using the syntax: alter type var_date(date10) and changed to yyyy, the 2 cases became these: 01-Mar-2041 12-May-1953 My question is: why in the...