Questions tagged [anova]
ANOVA is an acronym for "analysis of variance". It is a widely used statistical technique to analyze the source of variance within a data set.
anova
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R - How to automatically feed in parameters from aov() to power.anova.test()
I need to implement an assessment of the statistical power of ANOVA tests into my automated analysis workflow in order to point out in which datasets an ANOVA-analysis bears any statistical relevance, ...
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How can I store list of t1waybt ANOVAs (WRS2 package) into a data frame (R)
I have computed 12 ANOVAs using WRS2 package, with the t1waybt function. I would like to be able to put all of these results into a data frame so I can view/print them all.
I have tried the following ...
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What is the best test to run to compare presence/absence of something between sampling locations?
I have data on the presence/absence of four different pathogens found in edible crabs in 7 locations over 2 seasons. For this study, 30 crabs were collected from each site and for each crab the ...
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Problem with factors with a linear model lmer
I have a problem with a linear lmer model. Indeed, I have several factors that interest me and I want to see if they have an impact on my data. I have 6 of them and for 4 of them, I have no worries. ...
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r - ANOVA on a distance matrix (nesting required?)
I have an experimental design intended to investigate the influence of two treatment factors (A with 2 levels and B with 8 levels) on the proportions in 8 groups. However, due to technical reasons, I ...
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Discrepancy between grouped and ungrouped output of HSD.test from agricolae package in r
HSD.test with group=TRUE assigned different significance letters to all three groups in the PlantGrowth dataset, but when HSD.test is run again with group=FALSE, the control group shows no significant ...
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How to carry out Dunnett's post hoc correction on a 2-way ANOVA in R?
How can I perform Dunnett's post hoc correction after a 2-way ANOVA in R?
The Dunnett's test compares every mean to a control mean. Using ToothGrowth dataset as an example, lets just say that that ...
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r - Post-hoc tests for repeated measures ANOVA with aligned rank transformed(ART) data
I'm working on a 2x3 factorial design with two within-subject variables and I'd like to test for both main and interaction effects. Since the data is not normally distributed, I've performed an ...
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Appropriate Statistical Test for pre to post data with imputed data sets?
Thank you in advance for your time and help!! I'm working with data with 70 participants that completed an intervention. Participants completed surveys before and after the intervention (so pre and ...
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R - multcompLetters Error undefined columns selected
I have a problem with the multcompLetters4 function. I have done anova and tukey test and now I want to generate letters for a boxplot with the function. I have seen a youtube video and did it exactly ...
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Grouped barplots with error bars and pvalue pairwise comparisons
Am new to stackoverflow and would love some help.
I have a dataset as below. I would like to create a barplot showing pairwise comparisons between treatment groups as shown but with significance stars ...
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How to adjust R's aov code for CRD, RCBD and split plot design?
Let's say I have a data file named DATA1 for a 2-factor experiment with A and B columns as factors, and X column is the measured data. So how should I write the aov code for ANOVA of this experiment, ...
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How to make statsmodels' ANOVA result match R's ANOVA result
The following question is sort of a concrete adaptation of a post on StatsExchange.
The following R script runs just fine:
library(reshape)
J1 <- c(9,6,8,7,10,6)
J2 <- c(2,1,4,1,5,2)
J3 <- c(...
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How to extract P-values and append them to an already existing dataframe?
I am trying to write a simple code where it runs one-way ANOVA for each column, where the data looks like this:
PROTEIN A
PROTEIN B
A1
Cell 1
Cell 2
A2
Cell 3
Cell 4
B1
Cell 5
Cell 6
B2
Cell 7
...
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Getting Size Error When Putting Dictionary Values In One Way ANOVA Method
When I try to put the values of my dictionary into the SciPy f_oneway function it gives me an error saying that input is too short (must be greater than 1), but the length of it is 3 so it should be ...
