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.

Filter by
Sorted by
Tagged with
0
votes
0answers
17 views

Statistics Feature Selection

I have a certain confusion in deciding the importance of the feature.(I suffered the google, but couldn't get an exact idea) For Categorical independent variable and Categorical dependent variable- ...
0
votes
1answer
57 views

How to find if the means of multiple groups are significantly different when the data is of non-normal distribution: Kruskal-Wallis?

I have dive data from ten shark tags. The tags recorded depth every 10 seconds while at liberty and returned a combined total of >900 k depth records. I would like to see if there is a significant ...
1
vote
1answer
13 views

Is it apporpriate to use two way ANOVA test if I have paired data linked to single individual?

I am new in statistics. I wanted to do some statistical test to determine whether there is a difference between two samples and over the individuals. So if I have data that looks like this: ...
0
votes
1answer
12 views

Can we say all n-way ANOVA tests are also factorial ANOVA?

Factorial ANOVA tests have multiple factors (ie, independent variables). For example, can we say the names two-way ANOVA and factorial ANOVA are equivalent and interchangeable? Yes, the former name ...
0
votes
0answers
12 views

Distribution of the grand mean (mean of means), and case of stratified sampling

I am having some trouble while estimating the distribution of the mean of means, according to the type of sampling. Basically, I sampled N=1000 sets of n=100 random numbers distributed as an uniform ...
0
votes
1answer
28 views

Should a nested random effect be included if it has only one level for ONLY ONE fixed effect level?

I have one fixed effect (group) and one nested random effect (nested). There are 20 levels of ...
1
vote
1answer
16 views

Pre and Post Survey Analysis in ANOVA Excel

I have a small end size of 6 participants. They all took the pre and post survey that had 10 questions with ranges associated with them. I did not ID the participants. I am wondering how to plug this ...
0
votes
1answer
37 views

Why is the SS(A|B) larger than SS(A) in anova analysis

...
1
vote
2answers
22 views

ANOVA Conceptual understanding [duplicate]

I am trying to understand ANOVA. When we look at the null hypothesis we are trying to make a statement about the means. But what we indeed calculate is the variances, and make statements about the ...
1
vote
0answers
8 views

Comparing two correlations/regressions with a repeated variable?

apologies this is possibly a repeat question but I have done a fair amount of googling and the answer is not obvious to me. I have two variables each measured on different days. Say a_day1, a_day2, ...
2
votes
0answers
11 views

Which statistical test for two group proportions over two time periods? 100% sampling, capped membership. Independent groups over time

I'm comparing the number of male and female hires at a city in the 1980's to the number of male and female hires in the 1990's. I'm looking for whether the percentage of females increased ...
-1
votes
1answer
28 views

Is this statistically significant?

F value 42.341 P value 1.6E-07 F c.v 3.554 The p-value is more than 0.05 but the F value is significant. Or is the p-value considered small since it has E?
1
vote
1answer
24 views

Hypothesis test for comparing means of many groups, with unequal variances?

I am looking for a hypothesis test to compare the means of many groups similar to ANOVA or Kruskal–Wallis. The problem is my data does not meet the necessary conditions for these tests having ...
0
votes
0answers
16 views

Group comparison for linear regression?

I am analysing data and was wondering which analysis to use. I have two groups of participants which received two different kind of treatments (trt1, trt2). There were two times of testing (time 1, ...
1
vote
1answer
46 views

Nested ANOVA and Assigning Proportion of Variation

I have blood biomarker data from 6 subjects. Blood was collected on 3 occasions from each individual. Each blood sample was processed 3 times (3 technical replicates). I want to use these data to ...
1
vote
0answers
23 views

Post Hoc Testing Repeated Measure Anova in R

I have a list of patients and their footfall specific velocities. Each patient has come in for two visits: the original and the retest visit. At each visit patients were asked to walk at six different ...
1
vote
0answers
11 views

Which test I should use to analyze the data from a Likert survey?

I'm now analyzing my data but it has frustrated me a lot! I have no idea what test I need to use. I'm going to do an experiment about second language acquisition, before that I have to evaluate my ...
0
votes
0answers
14 views

Performing permutation based mixed ANOVA using 'ez' package

For my analysis, I would like to compare the balanced accuracies of 3 different models on 2 different data sets. Since I used repeated nested-cross validation, I would like to be on the safe-side and ...
0
votes
0answers
23 views

Robust Bootstrapped tests (ANOVA, T test)

I am reading into robust tests and one of the questions that I have revolve around the bootstrapped version of robust tests. For instance, in addition to the Yuen t test based on trimmed means, there ...
0
votes
0answers
7 views

Comparing most effective treatment vs control in ANOVA

I have control data and observations from N treatments (lets say 100 points each). All I care about is whether any of the treatments are significantly higher than the control data. What test would I ...
2
votes
1answer
44 views

incorporating biological replicates in one-way ANOVA

I'm measuring a particular property of worms (e.g. length, speed, ...). The worms are subdivided in 3 treatments (genetic strains) and each treatment group consists of 15 individuals. I replicated the ...
2
votes
0answers
35 views

Why do we conduct one-way ANOVA instead of jumping right into multiple comparisons if we have a simple, single main effect dataset? [duplicate]

This question is for simple data structure that involves one main effect only. I can definitely see ANOVA's usefulness in more complicated data containing multiple effects. Aside from being a "...
2
votes
3answers
50 views

Why I do not get the interaction output using aov function in R

I hope you are well. I am analyzing some data related to some bacterial phylum. Here is the data: I am writing the aov function as the following but I do not get the interaction value. ...
0
votes
0answers
17 views

What is a suitable non-parametric post-hoc test for a mixed factorial design?

I have a mixed factorial design. In total there are 3 factors: 1 factor is within-subjects (3 levels: i.e., time points) 2 factors are between-subjects (3 levels each: i.e., behaviors, environments) ...
0
votes
0answers
24 views

What is the proper way to run a repeated-measures ANOVA with the following design?

I have a dataset from a study that used the a 2 (Intervention: A vs. B) x 2 (Intervention Type: Auditory vs. Visual) within-subjects design (seems innocuous enough, but see below). There is one ...
1
vote
2answers
37 views

1-way ANOVA contradicts nested ANOVA

I have a response "rate" that has two factors "variety" and "strain" as possible covariates. I am trying to figure out if the different levels of "strain" have the same effect on "rate". When I run ...
0
votes
0answers
15 views

Into the maze: paired t-test, Hotelling's test, factorial, 2-way and 3-way ANOVA

First things first: I would like to say that I can be considered a beginner in the field of statistics and now that I have a complex task I feel lost. Basically I need to select the best statistical ...
0
votes
1answer
64 views

Bayesian ANOVA : simple main effect and post-hoc analysis

I'm conducting a two-way ANOVA with one within-subjects factor A (A1; A2) and one between-subjects factor B (B1; B2), but I would like conduct this with the bayesian approach. I did it with JASP. ...
0
votes
2answers
33 views

Why is the ANOVA p-value <.0001 even though the means are identical?

I am trying to use ANOVA on rank transformed data. Here is a summary of my dataset after omitting NA values: ...
0
votes
0answers
14 views

Degrees of freedom with categorical variables

I am constructing a Sequential ANOVA table using categorical variables. Variable $A$ has 2 levels, variable $B$ has 3 levels. I want to find the degrees of freedom for $A, B, A:B$ in the sequential ...
0
votes
0answers
18 views

Is there an idiomatic way of setting constraints on parameters in R?

Let's say I have 2 categorical variables foo and bar that have the same 4 levels A, B, C and D I have a response variable $Y$, ...
0
votes
1answer
21 views

I don't know what to test to se for working out a correlation

I am researching how canine characteristics affect the length of stay (LOS) in rescue shelters. I have historical data and want to test the correlations. Characteristics I want to measure are: ages (5 ...
0
votes
0answers
7 views

Comparing empirical distributions from two groups of subjects with repeated measures

I have a design where a continuous variable is measured over time in several individuals in different groups. I am plotting the distribution of that variable estimated from the data by kernel density ...
0
votes
0answers
13 views

Three way repeated measures anova interpretation

I'm doing a three way repeated measures ANOVA (2x2x2), but I don't have a significant three way interaction (see picture). I though I should watch to the two way interaction, but this one is also ...
1
vote
0answers
21 views

How to analyze repeated measures when condition changes at each time point?

I have a dataset from a repeated measures experiment that I am trying to analyze. The experiment had 4 possible conditions. Participants were measured on 1 condition and then again on a second ...
0
votes
0answers
5 views

mixed models vs anova for within-subject design

I know this topic may have been handled before and I apologise for being so lazy in checking all the other posts. Here's my concern: I have a group of babies (so everything is within-subjects) whose ...
0
votes
0answers
36 views

Interpretation of two-way ANOVA result

does anybody knows how to interpret two way ANOVA result. My data looks like: ...
0
votes
0answers
14 views

3-way between*within*within random effects structure lmer

I'm confused regarding how to structure random effects for a 3-way mixed effects model in lmer. I've found a couple of helpful sources: e.g. http://www.dwoll.de/rexrepos/posts/anovaMixed.html#two-way-...
0
votes
0answers
20 views

Using propensity scores to calculate average treatment effects

I have obtained class probabilities for 0 or 1 classes ("control", "treatment"). can I also assume that these are also the propensity scores. If so, how do i use these probabilities or propensity ...
0
votes
0answers
5 views

Do LS-means correspond only to type 3 (marginal) ANOVA or do they match the type 2 too?

I understand, that sequential type 1 ANOVA corresponds to unadjusted, raw (data-based) arithmetic means, and marginal type 3 ANOVA corresponds to LS-means (model-based predictions). In case of no ...
0
votes
1answer
30 views

Paired T-testing or ANOVA?

I have data of the structure below. im confused about using paired sample t-testing vs ANOVA. Paired T-tests make sense to me, but im worried; because there are 7 outcome measures, am i violating some ...
2
votes
2answers
44 views

Interpreting interaction from two-way anova table

I've conducted three pairwise comparisons of variables and the results were as below: ...
1
vote
1answer
31 views
0
votes
0answers
18 views

Which statistical method to use? Two way ANOVA?

I need some help determine which statistical method is best to use: In a mine expansion a forest is destroyed. Prior to the expansion 10 plots were established to measure the deadwood volumes. Three ...
0
votes
0answers
12 views

R, (mgcv)gam, anova; more variables- worse model?

I have been doing and comparing gam -models, and I don´t understand some of the results concerning residual deviances. My full model: ...
0
votes
0answers
15 views

Homoscedascity tests for Two-Way ANOVA (a factor and a covariate or two factors)

I have the following formula: glm1 <- glm(y ~ g1 + g2, data = fish, family = binomial) y is a binomial variable: num 1 1 0 0 1 0 0 0 0 1 ... #There is (1) or ...
1
vote
0answers
26 views

Best approach for maximising power?

This seems like a relatively very simple question compared to the apparent complexity on this forum. I'm putting my PhD method together, within-subjects experimental design (counter-balanced related ...
0
votes
1answer
45 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 (...
0
votes
0answers
8 views

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 ...
0
votes
0answers
26 views

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 ...

1
3 4
5
6 7
85