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Questions tagged [posthoc]

181 questions
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What is the most appropriate method for contrasts in lme (nlme)?

I have a question regarding conducting post-hoc contrasts in a mixed glmm model. Essentially, my data is a series of response variables with fixed factors of 'Subject Type' (three types of subjects), 'Treatment' (four treatments), and 'Year' (two…
choppedpete
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Tukey HSD for three-way interaction term in R

For each dependent variable (time, mass, rate, quotient), I constructed a three-way ANOVA with gender, age, temperature and all interactions as the independent fixed factors. My outputs range from getting a significant two-way interaction term …
user4730784
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R: GLM between treatment groups for each colony: effect plot

I'm still learning how to use r and I have some trouble making an effect plot based on Tukey posthoc tests. I have a dataset with 3 colonies (A, B and C, see below). Each colony is divided into 2 treatments: control and DWV. I have to run a GLM to…
Rose
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For a stats class assignment I have to show that the anova will pick up significance in cases where the t-test does not?

How can I run a Holm-Sidak test on a repeated measures anova in R? MeanSEP is the voltag potential from the result of a paper I have to recreate the statistical testing for in a class. I am looking for a significant difference between the…
Angus Campbell
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R lsmeans adjust multiple comparison

I used lme4 to run a mixed effects logistig regression (by calling glmer) in R and now I am trying to do post-hoc comparisons. As they are pairwise, Tukey should be OK,but I would like to manually adjust for how many tests the correction should be…
LaNeu
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Error with post hoc tests in ANCOVA with factorial design

Does anyone know how to do post hoc tests in an ANCOVA model with a factorial design? I have two vectors consisting of 23 baseline values (covariate) and 23 values after treatment (dependent variable) and I have two factors with both two levels. I…
Alexm
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How to run Dunnett C post hoc test in R?

I ran a two-way anova in r with my data set (unequal sample sizes, unequal variance): 1 variable measured across 3 species (with males and females in each species). This produces a significant result between species, so I want to know which pairwise…
user2736492
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Tukey HSD post-hoc test on a prop.test(..) in R

I'm doing a prop.test() on 3 groups: data = data.frame(a = c(85*0.3412,85*(1-0.3412)),b = c(203*0.2217,203*(1-0.2217)), c = c(231,197)) prop.test(t(data)) The p.value is very low (1.041e-13). I want to know which pair of groups show a significant…
Remi.b
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Tukey Post Hoc Anova shows unexpected degrees of freedom

I am running an anova in R using lme4 package to investigate the effects of LUT and Climate on EMF (dataset with 50 observations below). Afterwards, to investigate, where the effect occurs, I perform a tukey posthoc analysis using lsmeans package.…
Friedrich Scherzinger
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Need for contrasts in ANCOVA?

I'm currently trying to compute an ANCOVA as follows: library(car) model <- aov(speed~car+engine, data = car_data) Anova(model, type="III") library("multcomp") m4 <- glht(car_data, linfct = mcp(car= "Tukey"), alternative =…
trying_1999
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Pairwise comparisons with weights in R

I ran a weighted Kruskal Wallis test using the survey package in R. The result shows that there is a significant difference between groups, but does not specify between which ones. Therefore, I´d like to follow up with weighted pairwise comparisons…
seb-29
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how can I change the header name in post hoc test result table?

I want to clarify the name of each row and column with specific name. however, it's shown only with the number (1,2,3,4,5...). I performed post hoc test named as dunn's test, after kruskal wallis test for non-parametric graph. sp.posthoc_dunn(data,…
jay
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Execute ANOVA & Follow-Up Tests on multiple columns

I'm attempting to perform a Hinkin and Tracey content validation on potential scale items and have the following dataset (sample) with 74 unique columns: cleandata <- structure(list(Condition = c("RS", "AS", "BGPS", "APCS", "OP", "TS" ), alt_energy…
Dan
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Emmeans posthoc testing of linear mixed model

I've read a ton of posts and am trying to teach myself linear mixed effects model analysis in R, so I appreciate any help I can get. I really just need to brainstorm with someone who knows what's going on, and I don't have access to that easily. My…
LostAndConfused
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Controlling for multiple comparison

I have quick question. I am performing a study involving 4 treatments + control. I want to know if and which treatments differ significantly from each other on an outcome variable. My ANOVA is significant and I now want to conduct a post-hoc test to…
Nicolas N.
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