Questions tagged [interaction]

A situation where the effect of an explanatory variable may depend on the value of another explanatory variable.

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Post-hoc testing for cumulative link mixed-effects model with interactions in R

I'm a resident physician working on my doctor's thesis and I'm trying to analyse data from a survey with R. I have basic mathematic and rookie statistics skills. Participants of the survey have been ...
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9 views

Can I do moderated multiple regression with Process by Andrew F. Hayes when my moderator variable has 3 categories?

I have only seen it when the moderator variable has only 2 levels/groups/categories (dichotomous). What if my moderator variable has 3 levels? Should I just use a two-way ANOVA then since it also ...
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1answer
25 views

How to interpret OR confidence intervals for interaction or confounding?

This is a textbook problem I've been trying to understand I wanted to check if my thinking is correct (unfortunately there is no solution manual) I have a case-control study where I'm looking at ...
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28 views

Confidence Intervals on Indirect Effect: Moderated Mediation/Conditional Path Analysis in R

I'm trying to bootstrap confidence intervals for my estimates of the indirect effects of a mediation model. Because it is actually (first-stage, a-path) moderated mediation, I need to actually do this ...
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1answer
22 views

How to interact an across panel unit in fixed effect model?

I want to use fixed effect model but I want to test an interaction between female(1 if true) which is not changing across users(id). I wrote Stata code shown below and the results are shown after. IS ...
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13 views

R glmmadmb continuous vs categorical interaction multiple comparisons

I'm running a model using glmmadmb and I'm not sure how to do multiple comparisons on an interaction between categorical and continuous predictors. Here are details on the model and data: My ...
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31 views

How to add covariate x time interaction term in poisson model in R(relsurv package)

I tried to do relative survival analysis specifically poisson regression in relsurv package. And I want to include covariate x time interaction term since the hazard (or excess hazard) in my model is ...
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1answer
24 views

R: Methodologically sound way to determine which interaction effects to include in logistic regression? glmulti()?

I ran a logistic regression (in R using the glm function) and didn't find significance for a variable I expected to be significant (numerous articles have found significance). When I examined my data ...
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33 views

What statistical test should I use for moderation?

I am hoping to test an interaction effect, though being new to statistics/quant research in general, I am a little unsure as to which test would be most appropriate. I have read around using ...
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2answers
56 views

Main effects are not significant anymore after adding interaction terms in my linear regression

I have two models: $levelOfCreativity = \alpha Extravert + \beta Woman + \gamma hasACollegeDegree + \zeta isOlderThan25$ $levelOfCreativity = \alpha Extravert + \beta Woman + \gamma ...
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1answer
27 views

interpreting coefficients of interaction terms between categorical variables [closed]

Assuming I have a linear regression model of the form: Y = a + (b1*fact1) + (b2*fact2) + b3*(fact1*fact2) + b4*other_var where, fact1, fact2 are categorical variables of 2 factors each, YES and NO ...
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140 views

Interpretation of linear regression interaction term plot

I am interested in looking at the relationship between plant productivity, temperature change and plant biomass change. I have run a linear model in R using the below equation for this with plant ...
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1answer
96 views

Regression: within and between-subject variable interaction

I have a dataset with the following variables, which are measured between subjects (i.e. 1 measurement per individual): ID: subject identifier ...
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15 views

GLM 3 factors, significant two way interaction. Pairwaise comparisons?

I used generalized linear models using 3 factors Each factor has 2 levels. My main effects are not significant, nor is the three way interaction But there is a significant interaction between factor ...
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6 views

How to analyse an individual difference interaction with a mixed design - SPSS

My experiment has two factors. One is between subjects (3 levels - no, low, or high distraction) and the other is within (2 factors - tasty crisps and untasty crisps). I've already analysed this, but ...
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27 views

test for moderation in a quadratic regression model

I am trying to test for moderation in a quadratic regression model. my results show significant evidence of a quadratic relationship on one of the independent variables (x1) and also significant ...
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1answer
39 views

difference between interaction with anova and contrast functions

I'm trying to understand the difference between the interaction with the anova function and the interaction with the contrast ...
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43 views

How to do a sensitivity analysis on a non-linear equation?

In the company, it is very difficult to actually do quotations for our customers properly because we do not have perfect information regarding the factors that affect the cost and profit. So I created ...
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1answer
35 views

significant interaction between two continuous variables

I am conducting cox proportional hazard regression modelling. Two predictors in the model, for example, the age and height, have significant interaction effects on the death outcome when both using as ...
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114 views

Interpreting interaction term on highly correlated variables

Somebody at a meeting today made the following comment about a Marketing Mix Model (Linear Regression) we run every year. We should account for the high collinearity of the two Marketing Variables (...
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1answer
22 views

Interaction term and sample selection

I have a dependent variable Y which is continuous. I want to study the impact of X on Y using OLS in a linear model, but I suspect the impact of X is more important for observations with a high value ...
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6 views

Control variable relevant for one group of subjects only (moderation analysis)

I'm comparing a group who read on paper and a group who read on tablet. I have data about Technology Acceptance (TA) only for the group who read on tablet. Since I don't have data for the other group, ...
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28 views

Intuition for why the “interaction variance” in an ANOVA is an estimate for the population variance

As I understand it, the general idea of the F-test is to exploit two different ways of estimating the variance in the population if all values actually come from a single population (see my reply here:...
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12 views

Comparison effects of regressors for several dependent variables

I want to study the effect of two explanatory variables $X$ and $Z$ on four different outcomes (which are binary variables, i.e. equal 1 if satisfied and 0 if disatisfied): $Y_1$, $Y_2$, $Y_3$ and $...
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22 views

Interaction effects for independent variables in percentages

If the Independent variables are in percentages, then will it make sense to calculate interaction effects using the original figures? or do I need to make any changes?
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12 views

Breakdown interactions in MIXED model SPSS

I have a 2x2x2 design, where two of the variables are repeated measures and one is a between-subjects manipulation. I need to break down the interaction to look at the 2x2 mixed interactions (Repeated ...
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37 views

Error Using Interaction Effect Between Individual and Time Fixed Effects

I am trying to run a two-way fixed effects model with an instrument using the plm function: ...
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22 views

Applying Bonferroni or Holm-Bonferroni correction to interaction effects and simple slopes

I am seeking to apply a correction to my exploratory analyses to account for familywise error. I am conducting moderated MRAs with 7 different moderators, 1 IV, and 1 DV. I am interested in ...
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46 views

Moderation analysis in within-subjects, repeated measures design?

trying to remember my college stats class while doing some data analysis for the organization I work for. I'm trying to find out which groups of people (gender, age) our program is most effective for. ...
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1answer
42 views

Can variable be both a moderator and partial mediator?

Is it ever possible for a variable to be a moderator and partial mediator? I have a hypothetical example, which I think shows this can be the case. But I might be making a mistake. X = Socioeconomic ...
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74 views

breakdown of 3-way ANOVA when 3-way interaction is not significant

i am going back to question that has been asked before here but all the answers that i read do not paint a very consistent picture on what you must do when performing a 3-way ANOVA and the 3-way ...
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1answer
12 views

What would be an appropriate in case of multiple moderators forward or backward regression

I am trying to test a model using hierarchical regression analysis. I have one predictor, one outcome and five moderators. My main question is should I put the moderators in the model using forward ...
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19 views

How to compute (and report correctly) the signifiance of interaction effect on categorical data, using logistic regression

I want to study the odds of success and failure at some test, depending on gender and some other categorical variables. I calculated the Odds Ratios (OR) of success using Logistic Regression, with « ...
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62 views

Cox proportional hazards model with interaction terms

I am looking at a survival analysis using Cox PH models. I am interested in the effect of a continuous variable V1 on survival. I want to look at interaction terms with my model. I believe variable ...
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1answer
64 views

In multiple regression, why are interactions modelled as products, and not something else, of the predictors?

Consider multiple linear regression. This question might be deceptively simple, but I'm trying to intuitively understand why, say if I have predictors X1 and X2, then interactions between these ...
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14 views

Two correlated ordinal independent variables, several continuous dependent variables

I am currently struggling with a somewhat atypical analysis. People have been evaluating their cognitive state at two time periods – when they had attended school and at the present moment. Naturally, ...
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56 views

R glmer.nb : how building model with interaction between categorial variables

Before posting this, I made some research but I am very struggle with my modelling approach, so I will try to be clear in what I want to do with my data. I want to apologize if my questions are close ...
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8 views

Software that finds correlations between loosely dependent time-series?

I'm not sure if this is the right kind of question for this site, so please let me know :) I'm looking for a time series data analysis platform, so I can take a collection of time series at 15-...
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25 views

How do I interpret a significant three-way interaction when all two-way interactions are not significant? [duplicate]

How do I interpret a three-way interaction when all two-way interactions are not significant?
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2answers
145 views

Calculate interaction effect confidence intervals in zero-inflated poisson regression

I'm conducting a zero-inflated Poisson regression using the pscl package in R. I've included interaction terms but am having an issue with interpretation. I am assuming an additive effect and summing ...
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1answer
89 views

multiple logistic regressions with binary predictors vs single logistic regression with categorical predictors

I would like to know which is statistically more advisable and what are the advantages and disadvantages of each approach. My data frame data has ...
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39 views

Independent variables and moderator variables correlate (three-way interaction)

let's assume I hypothesize: H1: A direct effect of X1 on Y H2: A direct effect of X2 on Y H3: A two-way interaction between X1 and X2 H4: A three-way interaction between X1, X2 and X3 H5: A three-...
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1answer
50 views

Effect Modification, Confounding, and Correlation

I am trying to estimate the effect of a policy intervention (X) on patient outcome(Y) from an administrative data. In the data set, around 20% of the patients have received the intervention. Even ...
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1answer
84 views

interaction with a mixed logistic regression using mlogit on choice data

What is the best way to analyse interactions in choice data between an individual specific variable and an alternative specific variable? I have designed a discrete choice experiment in which ...
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55 views

Interpretation of interaction terms

I try to improve my statistical knowledge and right now I am working on a regression that contains interaction terms. I am currently investigating the effects of different variables ($a_1$, $a_2$ etc.)...
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16 views

Obtaining the fitted values of main effects and interactions when GLM coding is used

In short, I need to decompose the fitted values obtained from ANOVA into components corresponding to each term in ANOVA statement. This problem appears trivial, but it becomes tricky when GLM coding ...
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0answers
11 views

Comparing two difference-in-difference models when making the treatment group larger

I have a question regarding some potentially existing empirical tests in the difference-in-difference context. Assume that I have the usual setting of observing some hypothetical outcome for a ...
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33 views

Method for testing interaction in regression analysis

I am running a linear model with 6 explanatory variables (5 in classes, 1 quantitative), and would like to test which interaction(s) are eventually significant. I think an ascendant stepwise method ...
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19 views

testing specific effects from a significant interaction in mixed models

Let's say I have this model ...
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6 views

regression analysis assessing the relationship between brain volume and behavioural score, main effect but what to do with the moderating variable?

I am conducting a regression analysis to look at the relationship between a behavioural score and brain volume. My sample is made of 2 patient groups: A and B. The model includes the following ...