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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Repeated measures with categorical variables in SPSS

I'm looking for some help with my thesis. The research is the following: I asked my respondents to give an alibi for several time periods; a day ago, a week, a month, 6 months and a year ago. For ...
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Planned Orthogonal Comparison Type I Error Rate and the Number of Independent Contrasts

I am confused about Type I error rate and the number of planned independent contrasts in Planned Orthogonal Comparisons in one-way ANOVA. If we have a factor with 5 groups and we would like to test ...
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5 views

The use of MANOVA, ANOVA or t-tests for Likert-style data

I have two groups I would like to compare on a series of Likert-style mood dimensions (e.g. Very Sad - Slightly Sad - Neutral - Slightly Happy - Very Happy). The sample sizes are 19 and 63. The data ...
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48 views

Combining two variables

I have a questionnaire about factors that affect trust in online shopping. The questionnaire is split into 5 topics (such as security, privacy, website design etc.) with 2 questions per factor. I've ...
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One-way Fixed model

Duppose we have 12 treatments, and to start the experiment we choose these treatments, randomly. However, after selecting one treatment, all the samples are gathered and we shift to the next treatment ...
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Is it possible to get an interaction in Split Plot ANOVA (p = .02) and at the same time get a profile plot for estimated marg. M with no interaction?

In Split Plot/Mixed Design between-within (2by2 ANOVA with 3 DV) I got a significant interaction for one of my DV at F(1,196) = 5.467, p = .02. But when checked a profile plot for estimated marginal ...
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Why Type III ANOVA is used for this analysis of coefficients

Note that I'm giving (what I believe) is minimal information to solve this problem. If more details than what are provided here are needed, please let me know, and I can provide them. I have a model ...
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14 views

Calculating Tukey HSD for a subset of comparisons - can I do this?

A colleague has about 50 samples, each with 2 conditions (treated and non-treated). The data is continuous and normal, and there are 3 data points in each sample-treatment combination. They'd like to ...
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10 views

Plotting errorbars adjusted for multiple comparisons

I have run a 1 way basic ANOVA on 4 categorical variables. Afterwards, I ran multiple comparisons on all 4 groups (6 comparisons) & adjusted using the Tukey-Kramer method. This was all done in ...
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ANOVA single subject experiment

We have modelised an animal model to examine the distribution of a specific drug administered in two forms (either iv or per os) and a with a specific dosage (0.2, 0.4, 0.6, 0.8 ug for each ...
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1answer
16 views

Advice on method for correlation and regression of data

I'm having a dataset where I've measured the decay of a certain drug at different time intervals. I have on measurement for each time interval, and I want to test if there is a correlation. Straight ...
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8 views

Repeated measures ANOVA in a time series

I have a study design where 30 patients exercise breathing room air and then subsequently breathing reduced oxygen. Each subject has their cardiac output measured at 3 levels of exercise (low, medium ...
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What statistical test do I do for this question?

Does hypertrophy training reduce the occurrence of ACL injury in professional men's football players? Also what sample size should I use and how is it worked out? I will be splitting participants ...
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4 views

lmer giving different loglikelihood based on different subroutines

So I am having a problem understanding how the same model can have different log-likelihood values using different functions. So I am using the sleepstudy dataset just to point out the difference: ...
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4 views

What does the results from the parameter estimates option from SPSS' mixed ANOVA mean?

Using the General Linear Model procedure in SPSS, I ran a mixed design ANOVA with one between-subjects factor and one within-subjects factor. I selected the 'parameter estimates' option and got the ...
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5 views

Parameter estimates and estimated means for 3x2 Mixed ANOVA and 3 separate one-way ANOVA

So I have a between-subject variable (3 time points) and a within-subject variable (2 treatments). I obtained their estimated marginal means after doing mixed ANOVA with interaction term. I also did ...
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10 views

Interpreting Tukey HSD p-value After ANOVA + FDR correction

I'm currently analyzing a dataset where I have gene expression pathway activation scores across three groups: two different treatments and one control (so, basically a matrix of the form pathways x ...
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7 views

anova versus LME

I have a very simple model and problem, but am confusing myself in model comparisons. Please help. I am running a model that is a single group pre-/post-test design. No control group. I am running an ...
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11 views

How to do feature selection using Anova? [closed]

I am working on getting best feature for training the input in Neural Networks. So for getting best features I am thinking of using Anova. I have total 95 features. So how does anova works? Do I have ...
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6 views

Is it meaningful to look at predicted values vs residual plot to assess homogeneity of variance assumption for mixed ANOVA?

I have two-way mixed ANOVA. I remembered getting the a single value predicted values when I plotted predict vs residual plot for one-way repeated measures ANOVA. So is it meaningful to produce the ...
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136 views

Test for whether two data sets are significantly different

There are 1400 red snails, 800 blue snails, and 500 green snails. There are three parks: Park A, Park B and Park C I find that - 800 red snails live in Park A , 200 red snails live in Park B and 400 ...
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18 views

Data does not have a normal distribution but has homogeneity of variance

I'm trying undertake some statistics for my masters thesis but I'm having some problem with my data not being normally distributed. I've essentially got 3 factors, one with 2 levels, one with 3 levels ...
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16 views

Can I use an ANOVA to compare success rates (binary data) from different groups?

I am trying to compare the effectiveness of 12 heuristic procedures. Therefore I am calculating the percentage of the solutions which are correct (thus binary, correct or not). To do this, I compare ...
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8 views

Treat repeated measures receiving treatment from a certain period with lme4 package

I have a repeated data on which I’d like to apply lmer from package lme4. My data: every quarter of a certain year, the ...
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14 views

regression analysis or MANOVA or..?

We have this data from 5 different treatment groups with a different sample sizes and need some help for analysis. Participants were randomly assigned to a group and were exposed to a certain ...
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How to do posthoc comparisons for unbalanced 2-way ANOVA (type II SS)?

I am using the car package to perform a type II ANOVA on unbalanced data. My two factors are "storm size" and "storm frequency." I have two storm sizes and four storm frequencies. I only have both ...
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7 views

Compute interrater reliability having different subsets of students rated by different subsets of raters

I would like to compute inter-rater reliability for a set of continuous items, having different subsets students assessed by different subsets of raters (please, see the picture). I would like to ...
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How to test difference from 50%

I'm using R studio to analyse my data: I have a dataset of zebrafish with independent variables: treatment and sex as in this attached graph. I'm testing the percentage of 600s that the fish spend in ...
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25 views

Which statistical test best suits for analysing my data?

I have a simple question. I have seven groups of experimental data like treated (Triplicate) and one control group. Here, I have three variables for each group 1. Body mass, Liver weight and bacterial ...
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17 views

How to correctly analyzed a mixed within-subjects/between-subjects design?

I recently ran a perceptual study in which I aimed to measure how emotion recognition accuracy from whole-body motions changed when two type of body representations were used. Five actors Ai with ...
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40 views

Multiple Correspondence Analysis [closed]

I have a problem I can’t find a way to solve, even though I think it’s possible. I have an Excel file with some data related to patients. The patients have a certain diagnosis [coded as a number (1, ...
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27 views

ANOVA : mean or variance?

I am confused about the ANOVA method in Statistics. ANOVA stands for analysis of variance. It is used to compare the mean between several groups. We use a test of variance (Fisher) for ANOVA. So, is ...
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31 views

Which R statistics tests to use in order to compare the effects of different variables on a test score

cross posted from StackOverflow I'm hoping someone can help point me in the right direction. I've got a data set which includes 'testscore', 'User Type (a or b)', 'Gender' and 'Age Group'. The data ...
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Confused about F-contrast and F-test in statistical software

Let's say I have an estimated parameter $\beta$ from a general linear model for 2 subject groups (with the $\beta$s corresponding to their means). If I wanted to do a two sample t test in a ...
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multicomparison treatment against 2 controls

i'm new in "r" and in statistics. I have some data that i would like to analize. Just to give you a background of my experiment: 1) i have 4 treatments (ifferent concentration of drugs) 2) i have 2 ...
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Paired samples t-test (within-subjects) shows significant effect, BUT no main effect shows in Mised ANOVA - help!

Running some data looking at pseudoneglect: participants viewed figures that either had no change or small change in either left or right visual fields. t-test gave a signficant result, with ...
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62 views

Mixed model or ANOVA on differences in pre-post design

I want to analyse the effect of different treatment types (control, treatment1, ..., treatment4) on the surface of specimens made of certain materials (...
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14 views

Most appropriate test for count data

So I've performed an experiment whereby I had 12 1km transects. 6 of these were along rivers running through agricultural land and 6 through woodland. These were arranged in pairs so that each agri ...
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1answer
35 views

F statistic vs T statistic

I have a variable that I can divide to 3 groups: A, B, C. I want to check if the difference between the groups is significant. Should I use F-STATISTIC or maybe T-STATISTIC of each group vs. the other ...
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5 views

Tukey HSD for multuple variables and single variable giving different results [duplicate]

I have tried to run Tukey HSD for multi-variable dataset. However, when I run the same test on a single variable, the results are completely opposite. To be more specific: code: ...
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20 views

One-Way Anova with only two values per group?

As shown below, I have two "fold-change" values for each timepoint (1wk, 2wk, 3wk, 4wk). One measurement is from the front and the other from a mid-section of the heart, but the way that we present ...
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Check for outlier in random effects

I have 3 treatements and each treatment is given to 2 random people from which 2 samples is taken from each person that gets the specific treatment. The dataframe in R below shows a sample dataset ...
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1answer
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Nested Anova vs Multilevel Linear Models

I am working on a problem which revolves around individual axons / nerve cells in two treatment conditions. All relevant questions are clearly on the axon level, and dependent on properties (size, ...
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Which analysis do I use for this experimental design?

Seeking feedback from those with a better quantitative mind than my own! Currently preparing my doctoral research proposal. I want to determine the impact that various levels of technology ...
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Using t-test/ANOVA on bounded data

Can a t-test/ANOVA approach to hypothesis testing be carried out when data has well-defined upper and lower limits and is not continuous? Let's assume a situation where data are generated by some ...
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8 views

beta coefficient in Anova with R and XLStat

I’m working with the software R and XLStat. I’ve conducted an one-way ANOVA (my categorical variable is 3 modal (1,2,3) and my ...
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1answer
49 views

Two t test or factorial anova?

I have two groups of maybe 25 people each. I want to know if there a difference between the two on a happiness score depending if the from one group or another (A or B) and if they'r old or yougn (C ...
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10 views

Group treatment with unbalanced repeated measurments

In this study I want to determine if treatment group b and/or c are different from control group a. There are 13 individuals in the study. The groups are unbalanced as there is a different number of ...
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Degrees of freedom in general full factorial design of experiments with missing observations

I am trying to calculate the total sum of squares SST and the degrees of freedom of an experiment with four features and three levels for each feature. It results in 3x3x3x3 samples (of course). ...
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How to specify these contrasts in R

Can anyone tell me how to create the following contrasts in R? ...