hierarchical model

  1. K

    Interpretating hierarchical regression results

    Hello, I’m needing a little bit of direction in understand my first hierarchical multiple regression data. My research question is to what extent does alcohol explain the association between negative mood and impulsivity in academic performance (DV). I’ve ran the analysis - at the first stage...
  2. S

    ¿Any suggestions? GLM, HLM, MLM Problem

    I'm new to Multilevel modeling and currently I been working on a business project and its data is related to multilevel modeling. I know a lot of things about how to approach this problem, but I will do my reasoning so you can tell me if it is ok or wrong. So I need a mind that know this type of...
  3. T

    Hierarchical linear modeling - minimum number of observations per group?

    I'm looking at the relationship between income and scores on an instrument. Income is estimated by ZIP code. To account for nesting (i.e., people within the same ZIP code sharing an income), I've run a mixed model with ZIP as the random effect. There's a mean of 1.9 observations per ZIP. Is this...
  4. C

    Multi-level Meta-regression using random effect for treatment? [R pkg metafor]

    I am a biostatistician consulting on a meta-analysis of 16 studies each w/ 2 treatment arms. The main interest is in the effect of the variable plateau pressure (PP from now on), on mortality rate. As there is a strongly significant difference in PP between the two arms, I do not believe both...
  5. U

    difference between estimating variance and standard deviation.

    In a simulation study, is there any difference between \bullet to estimate the variance \sigma^2, 1000 times and taking its average, and \bullet to estimate the standard deviation \sigma, 1000 times and taking its average? Can I do anyone of these? Is there any preference of doing a...
  6. S

    Bayesian Hierarchical Customer Spend Model

    Hi guys, I am trying to set up a Bayesian Hierarchical model for customer spending, and was hoping to clarify a couple of things. I want to look at the returns on investment amongst people who buy our products for a particular marketing initiative. So what we have is: - A general customer base...
  7. E

    help deciphering - hierarchical regression report

    Hi, I've just started by statistical analysis stage and I've had some strange outputs I was hoping someone could help me with. Two personality measures were entered into a hierarchical regression model and both were found to be significant predictors of heart rate with: N (β = 2.15, p =...
  8. A

    Choosing best model in regression - Backwards Stepwise + hierarchical modeling?

    Hello - my goal is to fit a model using backwards stepwise regression and hierarchical modeling, testing the association between a primary predictor variable and an outcome, while controlling for other variables. For example, if I were to test whether neighborhood walkability caused/was...
  9. P

    Two CFA vs second-order CFA

    Hi All, I'm working on my dissertation, and am evaluating the internal structure of a 34-item scale. The model in which the scale is based off of is hierarchical, and is structured/ordered as such: (1st) items, (2nd) item-groups, & (3rd) sub-scales. To evaluate this information I would use a...
  10. R

    [WinBUGS] Hierarchical Analysis in WinBUGS14 "Undefined Real Result"

    Hello, I'm new here so I hope that I am posting in the correct forum. I am building a stock-recruitment hierarchical model for Atlantic cod in WinBUGS14. In this case, I'm estimating several hyperparameters across several different and exchangeable stocks. BEFORE I can do that, I must...