interactions

  1. M

    The Effects of Autism-Like Traits on Balance

    I am going to do an experiment examining associations between Autism-Like Traits (IV) and balance (DV). To assess this, all of the participants will take the Autism quotient questionnaire and complete four different balance tasks whilst balancing on a wii balance board. I will the need to...
  2. S

    Correlation based on multiple measures / observations

    Hello everyone! I am hoping someone could offer me some wisdom and a few R tricks. I was lucky enough to get a pretty interesting data set for a study that I am doing. There is approximately 5000+ rows of data spanning 5 years for 100 different sales people. The data is structured per...
  3. P

    Generalized Estimating Equations (GEE): full factorial or separate interactions?

    Hello everyone, I have a question regarding full-factorial design and separate interactions using Generalized Estimating Equations (GEE). My research is about spatial biases and choice between the left and right sides. By using GEE separate interactions results show that bias is to the left...
  4. S

    Interaction terms with non-signficant main effects

    I am using a logit model to do the analysis on my dissertation data. 2 of the variables interact, so I have an interaction term. My question is 2 parts: 1. When I run the model without the interaction term, one of the main effects is not significant. Can I still include the interaction term...
  5. J

    Multiple logistic regression - need for interaction checking?

    Hello, and thank you for reading this post. I am a medical doctor with limited statistical knowledge, so bare with me... I am trying to answer the question: Does dispatching a critical care team (CCT) to out-of-hospital cardiac arrest improve survival? I have a dataset of 2000 cases and...
  6. N

    Power analysis (gpower) - interactions

    I'd like to conduct a power analysis in gpower to determine the total N required in a study, with the following requirements: power desired: 0.80 alpha: .05 effect size: unsure what to use here (explained below) study design: 2x2 within subjects anova (4 conditions) where my main...
  7. A

    What test to use for longitudinal data and to test interactions among factors?

    My study involves five plant varieties subjected to three cultivation methods in two different sites. Every week for six weeks, we record the specific daily growth rate of all the plants. I’d like to analyze differences in growth rates in terms of variety, cultivation method, sites, and time...
  8. S

    When is data 'nearly normal' - enough to break parametric rules

    Hi everyone, I am a student who has carried out a renewable energy experiment for a dissertation project. My dependent variable is total biogas production. I designed an experiment to hopefully look at the influences on biogas production of pre-treatment (Yes or No), Enzyme (Yes or No) and...
  9. R

    Semipartial correlations for simple slopes

    Hello! I'm in need of some help for calculating sr2 for simple slopes. Here is my situation: I'm using SPSS. I have three IVs: x1: dichotomous and coded -1,1 x2: dichotomous and coded -1,1 x3: continuous centered variable I have a 3 way interaction that I've calculated the simple...
  10. P

    SPSS: How to decompose interactions in repeated measures ANCOVA?

    Hello everyone, I have a problem, too. Anyone here who could help me? I conducted a study with three categorical within-factors and one continuous personality variable: topic (1,2) x gain loss framing (1,2) x achievement security framing (1,2) x personality I know how to use the...
  11. F

    Plot interaction effects

    Hi! I already know how to plot the predicted probabilities of binomial models without any interaction terms: predicted logit = a + bX predicted probabilities= EXP(predicted logit)/(1+EXP(predicted logit)) What I needed to know is how to do it when the model contains an interaction...
  12. D

    Question on 2-way ANOVA stat use and interpretation

    Hi everyone! I am currently working on publishing an article from my Masters thesis. I had real trouble with the statistics section which was also pointed out by the markers. I was hoping to get some advice on how I could make this section clearer, concise, and overall of a better quality...
  13. L

    Logistic regression, interactions

    I am having a nightmare and unfortunately my supervisors cannot figure this out either! I have an equation from logistic regression, of which the equation includes an interaction variable (2 variables combined). I need to produce a worked example, we can’t find out what happens to the...