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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How to prepare data for anova or manova

I have a datafile (below is Gdrive link) and I want to prepare it for Anova/Manova tests. About Data: ...
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Follow up tests for ANOVA and Kruskal-Wallis in MATLAB

For my non-normally distributed data I am using a Kruskal-Wallis test and for normally distributed an ANOVA test. In the MATLAB documentation it just says to use 'multcompare(stats)' function as a ...
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Is the Scheffé test of contrasts the “best-case” for post-hoc tests?

I am reading through Explaining Psychological Statistics, 4th Edition and am stumped after the following passage: Scheffé (1953) understood that the best anyone can do when creating a complex ...
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27 views

Will Tukey multiple comparison be the same for different types of Sum Of Squares of ANOVA for an unbalanced design

I am working on Two-Way ANOVA for an unbalanced design. Will Tukey multiple comparison be the same for different types (I, II & III) of Sum Of Squares of ANOVA for an unbalanced design. I am ...
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7 views

ANOVA with continuous time signal

I have a very large data set of a continuous time signal as measured force(N). I want to do a 4-way ANOVA to compare 12 groups in this data (or compare the signals). My question is, how should I ...
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24 views

Analysis of reaction times with missing data by trial/item

I have a developmental psychology study with one between factor (age) and two within factors (scale-3 and difficulty-2). I recorded reaction times but have eneded up with a lot of missing data for the ...
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21 views

May I analyze this kind of data with ANOVA?

I have the following kind of experimental setup. There are two different tasks (say A and B) the participants are performing. Each task is performed thrice (three times) by each participant. There is ...
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13 views

Using SKlearn SelectKBest f_classif for categorical values [closed]

I am trying to use SelectKBest f_classif on my data, which is of the following format: each observation is composed of a d-dimensional vector(d different features) and is associated with a label ...
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1answer
28 views

Help with choosing the correct effect size

I conducted a two-way between groups ANOVA to test the impact of video gaming (gamer/non-gamer) and gender (male/female) on reaction time. I'm conducted my analysis using SPSS and received the ...
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How to calculate Adjusted Means for Alpha Lattice Design? [closed]

I am using alpha lattice design for my breeding trial having 5 blocks with 20 entries in three replications. Can anyone help me in calculating adjusted means for my lines. Is there any SAS code for it....
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38 views

Proper statistical test selection / SPSS setup

UPDATE: Basically, my question boils down to, how can I compare the distribution of yes's and no's BETWEEN multiple subgroups to see if their difference is statistically significant (and get a p value)...
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1answer
27 views

Is it possible to find non-significant result from one-way ANOVA but significant results from individual post-hoc tests?

I'd like to get some advice on one-way ANOVA analysis with Dunnett's T3 post hoc test. Is it possible to find non-significant result from one-way ANOVA analysis (p=.224), yet find differences in the ...
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Sum of squares for the interaction effect for two-way ANOVA

How do I calculate SS(A*B) for the interaction effect for two way ANOVA? I know how to calculate everything else in that table.
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9 views

Calculating sample size for two-way ANOVA given effect size

I have an experiment with two groups and three timepoints (different subjects for each timepoint, so no repeated measures), and I understand a two-way ANOVA would apply to this situation. I'm trying ...
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46 views

Find predictive power through different score combinations

My situation is a bit too complex for me, given I'm a newbie in R and analysis. I have roughly nine different score types, each of which was a model itself built upon various variables for each score ...
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62 views

Poisson Modeling ANOVA

I'm looking to model percent change in transaction year over year for sales people grouped in certain categories (7 categories total). The percent change in transactions would be Q1 of the current ...
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1answer
24 views

repeated-measures linear mixed-effect model

I have two soil treatments: CT and NT. For each treatment, I have 11 CO2 measurements taken in 7 times, i.e. 11 "replicates" for 7 dates. I'd like to evaluate if the measurements are different in ...
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1answer
10 views

post hoc tests in ANOVA

While I am doing post hoc test for one way ANOVA, I am getting significant results for LSD but the same variables does not have significant values for Bonferroni. Why is it so?
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What is the null distribution of the between-group variance?

Scenario From a population, we randomly sample $n$ individuals, measure the normally distributed random variable $X$ and compute the total variance $V_T$ of $X$ in this sample. Then, we randomly ...
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Sensitivity analysis on constants: logit transformation for ANOVA

I have categorical looking-time data (looks to visually presented items A, B, C and D over a number of seconds), containing 0s and 1s. I want to compare groups (adults, children; n=~30 for each group) ...
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22 views

Same mean, different variance - test?

I have conducted an experiment where I am interested in how well different models for directional hearing works. For each model a sound is presented to a test subject, and the test subject expresses ...
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1answer
19 views

Only interested in select pairwise comparisons - Do I need to run an ANOVA first?

I have data with two biological factors. The first factor has 2 levels (say, Alive vs. Dead) and the second factor has 80 levels (protein of interest). I'm only interested in whether the mean value ...
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1answer
15 views

2X2 ANOVA: low power, statistical significance for only 1 IV, medium-low effect size

BACKGROUND: I run a 2X2 Between-Subjects ANOVA. I obtained: a low power (< 0.30) for both Independent Variables a not statistically significant result for one of the Independent Variables. ...
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Mixed ANOVA in R with unequal group sizes?

Spoiler alert: My stats education stopped before ANOVA so everything that I know, I learned myself. Design of data: I have 2 groups and a response variable is measured across multiple blocks in the ...
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Is repeated measures or mixed model ANOVA necessary for this analysis?

I've spent a long time generating and analyzing a dataset and now it comes down to the statistical analysis... and I'm not sure how best to proceed. In my dataset, I have rats sorted into one of 4 ...
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64 views

Interpreting output of analysis of deviance table from anova() model comparison

0 down vote favorite I have a large multivariate abundance data and I am interested in comparing multiple models that fit different combinations of three categorical predictor variables to my species ...
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1answer
18 views

ANOVA preconditions

I've got m samples coming from n different groups. What tests do I have to do before applying ANOVA to ensure that the preconditions are satisfied? Thanks in advance.
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Mean sum of squares and products according to source of variation in ANCOVA from R

How to get the mean sum of products using R to populate an ANCOVA table as given in the following link? Analysis of Covariance Table for RBD Ryy, Tyy and Eyy can be obtained as follows using ...
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33 views

Anova on logistic regressions linearity

I'm trying to find out if my numeric predictors have a linear relation to the logit of my logistic regression. I tried to use the lrm fit in the rms package where I have used 3 knot cubic spline on ...
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19 views

ANOVA analysis in regression

I have an issue regarding ANOVA analysis. Let me explain what I am looking for…You have 3 factors (A,B,C). Now in CCD or BBD you get ANOVA for ...
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8 views

Statistical test to determine most accurate method

This is probably a basic question, so apologies. I am trying to determine what is the most accurate reconstruction method out of 11 options, for which I have results for 15 specimens. I've looked into ...
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16 views

Tukey HSD for subgroup in a nested ANOVA in R

For the following data, I can do a nested ANOVA followed by post hoc test for Tech as follows using the aov function. The ...
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4 views

Greenhouse-Geisser correction vs Non-independence

In repeated-measure ANOVA, Greenhouse-Geisser correction is commonly used to handle sphericity issues (when there are more than three levels in a condition). But does it deal with data that violate ...
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21 views

anova() for model comparision _ Regression

let's suppose; I am fitting some models to a data set: ...
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10 views

Compare percentages

I am analysing pre-analyical errors in diagnostic labs. There are 15 types of different errors in the lab (such as hemolysed samples, clotted samples, insufficient volume, etc). Each of these errors ...
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What is the mechanism of f-test?

F-test statistic is the ratio of two variance and if the value of F-test statistic equals to 1 or closer to 1 that means that those two variance are equal then we do not reject the null hypothesis.But ...
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30 views

R: lme vs ezAnova: Different degrees of freedom for two-way ANOVA with repeated measures

I'm trying to run a two-way ANOVA repeated measurement with (1) lme and (2) ezAnova. The problem is that I get different degrees of freedom of the denominator (denDF...
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20 views

How to interpret non significant F-test for main effect (genotype), but significant differences in the means of the genotypes?

I am analyzing an experimental data set based on the trait values under drought condition. The experiment was carried out on three separate drought environments. First, I have done a single ...
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Capturing variability using ANOVA on date

I have a dataset of traffic count at several intersections at various dates. Most of the intersections were counted only once. I want to know if there is a significant daily and monthly variability in ...
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comparisons of means within grouping factor (after two-way ANOVA)

Let's say in each of ten very different schools, one half of students is offered free lessons in physics and the other is not. After the next examination phase, the physics skills of the two groups ...
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Literature (guidelines) on unbalancedness in two-way within-subject ANOVA

I am looking for literature (guidelines) which discuss the consequences of unbalanced designs on running a (two-way) within-subject ANOVA and pros/cons of various counter-measures. I came up with ...
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22 views

Minimal change to make to find a significant difference between conditions

So I have data for two groups with 5 subjects in each and a score for each of them. The anova test will show that there is no significant difference. It is now asking me to make a minimal change in ...
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57 views

How to run an ANOVA when there are multiple repetitions

I have a 2x2 repeated measures ANOVA (2 factors each with 2 levels). In addition each subject completes each condition multiple times (5 repetitions). So for example I would have Factor A, level 1 ...
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12 views

2x6 repeated measures ANOVA interaction and main effects question

Currently I'm graduating and I'm finishing up my master's thesis as we speak. It's a study about the effect of hand positioning on response time. I'm submitting my data to a 2x6 repeated measures ...
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20 views

T-test or repeated measure ANOVA?

I am a Phd student in neuroscience and not so knowledgeable in statistics. I have done an experiment and am not sure if i should use repeated measures ANOVA or independent T-test. The experiment is ...
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1answer
25 views

Dealing with missing data in Repeated Measures ANOVA

Hi :) I have a data set of comprised of: different subjects, each tested within subject (three time points) on a continuous scale, on various (unrelated) dependant measures. Some of these subjects "...
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105 views

Small sample size - repeated measure ANOVA or something more simple?

I have data from an ecological study on wasp abundance and diversity across a forest which I am trying to analyse appropriately. We have abundance data from ten locations that were sampled twice, ...