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Questions - anova

In R can you manually set degrees of freedom for lm() or Anova()?

I am replicating SPSS code in R that runs several Type 3 ANOVAs. In SPSS you can specify specific contrasts in an ANOVA (e.g., compare level 2 v level 4 in this 5-level variable). The resulting ANOVA ...
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Merlin37

r

regression

anova

Votes: 0

Answers: 1

Latest Answer

How about using the linearHypothesis() function from the car package: library(car) data(Ornstein) mod <- lm(interlocks ~ log(assets) + sector + nation, data=Ornstein) linearHypothesis(mod, "n...
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DaveArmstrong

Is there a way to correct for skewness caused by the control group in R?

I am working with a research data set where we exposed groups of small fish to a stressor and then sampled them at different timepoints to get an idea of how their cortisol (stress hormone) levels cha...
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Toni

r

normalization

anova

skew

data-transform

Votes: 0

Answers: 1

Latest Answer

Non-Parametric ANOVA approach: You could theoretically just run a Kruskall-Wallis ANOVA if you want a non-parametric approach. # Load libraries: library(tidyverse) library(rstatix) # Run Kruskal on P...
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Shawn Hemelstrand

Running a robust mixed model ANOVA using statsmodel anova_lm

I have a data set of users behavior which I want to run series of ANOVA's on, based on there outcome of assumption checks. For situations where the assumption of homogeneity isn't met I would like to ...
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Navot Naor

statsmodels

anova

mixed-models

robust

Votes: 0

Answers: 0

extract multiple values based on other column

I have this data in r, which I need to make an anova with. My problem is, that I only need data out of Faktor 0 and 2 but not 1. I can access one with: FSQ$total_Sum[FSQ$Faktor=="0"] but I...
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Timon Doo

r

anova

Votes: 0

Answers: 2

Latest Answer

We may use subset for this. # option 1 aov(Faktor ~ total_Sum, data = subset(FSQ, Faktor %in% c(0,2))) # option 2 with(subset(FSQ, Faktor %in% c(0,2)), aov(Faktor ~ total_Sum)) Output Call: aov(f...
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Dion Groothof

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