Questions tagged [anova]

ANOVA stands for ANalysis Of VAriance, a statistical model and set of procedures for comparing multiple group means. The independent variables in an ANOVA model are categorical, but an ANOVA table can be used to test continuous variables as well.

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18 views

Post hoc test 2x2 design

I have a relatively simple 2x2 design. I give a hypothetical example. I have a continuous variable Y (Plant Growth) and I have 2 factors with 2 levels; Temperature (warm/cold) and Condition (...
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anova from likert scale data

I want to ask. I need to run repeated measure anova. Study of the effects of diff audio on awe experiences. I have 3 audio. Now i already put the data ( awe scale- likert ) and already got the sum of ...
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Correct method of creating a repeated measures ANCOVA in r

I am attempting to build a 3x2 repeated measures ANCOVA in R where the same participants were measured 6 times using 2 different intervention combinations. 6 demographic covariate questions were ...
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25 views

Some of my data is not normally distributed, what test should i use?

I am testing dating profile information and whether wanting children (yes, no, maybe) has an effect on how many attributes the seekers ask for. When testing for normality and homogeneity of variance ...
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Two-way ANOVA statistical test for statistical comparison of data? Suitable?

hope everybody is good during this period. I was trying to run two-way ANOVA test for my sample, but further I go with script in R I feel less confident that this is the best way to analyze my data: ...
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How to follow-up a repeated measures ANOVA with 1 between and 4 within-subject factors?

I'm having trouble determining the best way to follow-up the results of my repeated measures ANOVA with 1 between (group) and 4 within (time x IV A x IV B x IV C) factors. Time is pre-test, post-test ...
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What statistical analysis for this group

I know it's basic statistics but I am lost, I would like to check if the difference between group FEMALE and group MALE is statistically significant but I am stuck with all the definitions the groups ...
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RM Manova follow up - Unvariate or discriminant analysis?

I have a one-way repeated measures manova with participants measured on 2 DV's (both aspects of language quality) and one within subjects IV (condition). Participants were all tested over 4 conditions....
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Post-hoc test for One-Way Repeated Measures ANOVA

I need some help in understanding what kind of post-hoc test I would need to run after an ANOVA. Let's suppose that I have only 1 group of subjects and as independent variable I have "Condition". "...
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Insignificant result with one-way anova but significant with two-way anova?

I'm working on lung dataset of ISwR package in R. A book by Peter Dalgaard, has assigned me to answer this question: 7.2 In ...
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why anova() function is not applicable for models build using ridge regression and lasso regression in R?

linRidgeMod <- linearRidge(Class ~ ., data = training[,vars]) anova(linRidgeMod) or ...
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Which ANOVA method to use to compare variance explained between four lmer (linear mixed effects) models in R

Suppose I have four linear mixed effects models as shown: ...
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Testing for interactions using the aligned rank transformation test (non-parametric two-way ANOVA)

I am completing an aligned rank transformation as follows, using the ARTool package: ...
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Anova and Tukey HSD vs Linear Regression

When analyzing the difference in means between $k$ groups, a one way ANOVA is equivalent to a simple linear regression with indicator variables for group membership $$ Y = \beta_0 + \beta_1X_1 + \...
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What is analysis of deviance in linear mixed effect models?

I am using lmer in R. My response variable is gene expression (15 genes altogether, just using one in the example) and my fixed effects are disease status and also age. My code is as follows; ...
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ezANOVA with nested variable

I'm new to this page and looking for help with my ANOVA. I've collected developmental data from mouse pups from 2 days old to 20 days old. My data set has 1 control and 2 treatment groups. There are ...
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What is the equivalent contrast to one-way ANOVA

I am working in edgeR, an R package for differential expression analyses of read counts arising from RNA-sequencing. I need to conduct an ANOVA-like test in which the null hypothesis is that all means ...
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anova and tukey reporting

I have an ANOVA with a numerical score as the DP and a category as an IV: model = aov(score~group, data = dat) And then I run a Tukey: ...
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Statistical question about ANOVA, Tukey and t-test (also R-related)

I am new to statistics and have to do some analysing for a beginner project. However, I am so confused right now and have nobody that I can ask. About the project experiment: We conducted a between-...
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Why is the Brown-Forsythe test the only test returning: “The group variable must be one factor”?

When trying to run the bf.test, I get the error below. The group variable "Group" is a factor and ranges from 1 to 3. I've tried it with and without as.data.frame()...
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I am trying to decide which SPSS test I should use for my research- pre post questionnaire after intervention with 2 different groups

I have 2 participant groups Parents and teachers, both completing the same intervention (2 hour educational lesson) From the data I need to compare the answers of both groups to see this impacts on ...
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Anova question and post-hoc test (also r-related)

I am new to statistics and have to do some analysing for a beginner project. However, I am so confused right now and have nobody that I can ask. About the project experiment: We conducted a between-...
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Should I do some sort of mixed effects model or repeated Anova with my data?

I am wondering if I should be doing a mixed effect model or repeated ANOVA with my data. I am looking at feeding in sponges, particularly picoplankton which are in 5 groups (Pro, Syn, Euk, LNA, HNA). ...
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SPSS mixed-effects model vs Matlab FITLME : inconstistent results in estimated coefficients

I am trying to double-check the results I am getting with the matlab fitlme function by comparing it with the output of the SPSS MIXED procedure. The results of the F tests match perfectly, while the ...
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Organzing data in csv table: ANOVA on brain network

I'm looking at functional connectivity in a brain network, called the default mode network, which has 10 regions of interest. Meaning, if I was to do a comparison between each of the 10 brain regions,...
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How to do a 9-way Multi-way ANOVA without interaction effects?

I am doing FEM simulations, where I am changing 8 material parameters, each with 9 levels. I have used a Taguchi L81 array to do the simulations, and now I'm trying to determine which parameters are ...
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One-way ANOVA or Kruskal Wallis in SPSS for non-normal data that shows no homogeneity of variance?

I have fisheries catch data that I need to analyse for my thesis. I already did meta-analysis in Excel, and got some main trends and percentiles out of it. For other stats I am using SPSS. I was ...
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Research Design

Problem: Need Statistical Consulting for Methodology Section. Note: No help required with conducting or writing analyses. Only need help with finalizing the appropriate design. I am conducting a ...
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ANOVA of Model Performance metric

I have conducted multiple simulations of a hydrological model under a matrix of scenarios and calculated a Nash-Sutcliffe Efficiency (NSE) value for each simulation. The NSE is a model performance ...
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Two-way repeated ANOVA in R, got stuck in a case

I am currently doing some two-way ANOVA in Rsutdio. I downloaded a dataset from an article along with its result of ANOVA so that I can check my own result. Here is the head of this dataset and a ...
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MANOVA, linear regression or Chi-square?

We have a dataset we're trying to figure out what the best way to analyze is. The datset looks like this: Group (A/B) Sex (M/F) Race (x) Response (strong, weak, none) Any thoughts? looking at it, ...
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unbalanced three way ANOVA with missing data from one level of a factor

I wanted to make sure I was doing everything right, I believe I am supposed to do a three-way ANOVA but correct me if there is a better way to go about it. I have data on the feeding retention of ...
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60 views

Alternatives to three-way ANOVA with unbalanced and non-idependent data, non-normal distribution of the residuals and heterocedasticity

I have a response variable ("Value") and three categorical variables for which I want to test the main effects and interactions. ALL DATA COMES FROM ONE INDIVIDUAL for which we have data over time. ...
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Variance-Covariance Matrix (Sphericity): Valid?

I am completing a basic statistics exercise for a graduate-level ANOVA course (for psychology trainees). We've just started on repeated measures (i.e. within-subjects) designs, beginning with the ...
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Genstat warning message an71

When running an anova analysis of an experiment using balanced incomplete blocks using Genstat, I get this warning message: Standardized residuals approximate if not an orthogonal design Please ...
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Comparing amount of variation due to different variables in ANOVA

We have performed the same experiment under a bunch of different conditions, and now wish to know which type of change in condition caused the greatest variation in results. I.e., do results vary more ...
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Testing for similarity between countries

For my thesis, I am looking at the effect of environmental controversies on the profitability of Chinese and European firms. As part of my exploratory analysis, I have to check whether or not the ...
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Randomized Complete Block Design with Replicates

A horticulturalist conducted a nitrogen fertility experiment for lettuce in a randomized complete block design. Five rates of ammonium nitrate treatments (0, 50, 100, 150 and 250 lb/acre) were ...
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How to analyze effect effort has on catch of rare species?

I have df which has year, basin, number of sampling sites per basin for each year and then percentage of rare species (this classification is arbitrary, but it groups certain species as rare based on ...
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Calculation of genotypic variance in ARCBD

Thank you for your guidance and support during my statistical analysis. This time again, I fall in a problem for calculation of genotypic variance (GV) from ANOVA constructed by ARCBD. I know formula ...
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ANCOVA $\eta^2$ definition

I am struggling to find references to understand what is the exact definition of $\eta^{2}$ is two way anova. Let's say I am estimating the following ANCOVA model: $$ y_{ijk} = \mu + \alpha_i + \...
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Why do anova(lmer) and aov give different results also from Matlab anova?

I am running a LME analysis, with pupil_mean_bin as dependent variable, cond and phasetype as fixed factors and subj as random factor. I need to know the F values for this model, but I noticed that ...
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What type of ANOVA test should I use?

I have 2 independent categorical variables with 2 groups each, say ind_1 -ind_1a -ind_1b ind2 -ind_2a -ind_2b The outcome variable is quantitative and is measured at ...
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1answer
66 views

What test exactly does lm.anova perform in R?

I have always thought that anova(myFit) performs submodel test for each regressor in the model (i.e. comparing model with all regressors with model without the ...
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What is repetition in ANOVA?

I came across an explanation here, which states It’s whether you are replicating (i.e. duplicating) your test(s) with multiple groups. With a two way ANOVA with replication , you have two groups ...
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What is the “Mean Sq” column of “Residuals” in “anova” of a linear model in R?

Here is anova output from a linear model: ...
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Anova with unequal variances and sample size or multiple t-test

I am currently working on cross country average incomes. More specifically, I have figures for the average income in Germany, Spain, Italy and France. I need to test whether average incomes are ...
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19 views

One Way ANOVA or One Way ANOVA with repeated measure

I have LFS spanning 24 quarters, and I want to look at the effect of a policy on the sickness absence of a particular occupation. I want to use ANOVA to see if there is a statistically significant ...
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ANOVA results reject null hypothesis for all samples, is it normal?

I have done ANOVA analysis of the experimental test data on Matlab. The test data is about the flexural strength of products made from different mixes. Within each design mix, only one of the ...
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60 views

Courses or sources to learn ANOVA

What sources would you recommend to learn ANOVA (with and without software)? What are the prerequisites? If you could recommend me a complete course, online or books (I'd prefer videos but books/...

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