All Questions
Tagged with anova statistical-significance
372 questions
0
votes
1
answer
45
views
Bradley's liberal criterion
I'm reading an article where the authors utilized Bradley's liberal criterion to estimate the robustness of the F statistic in the context of post hoc tests.
The problem here is that they said the ...
1
vote
1
answer
42
views
Alternative for three-way ANOVA - 2 out of 3 groups have non normal distribution in their categories
I am analyzing capacity values from an aging test of 24 battery cells, which have three categories:
Battery Type: they can be 29V or 33V
Storage Temperature: 10°C, 20°C or 30°C
Storage SOC: 30% or ...
- 13
0
votes
0
answers
8
views
Evaluating the match between real data distribution and human-estimated interval
I would like to know what the best significance tests and metrics are to determine the fit of distributions in the following experiment:
Given a product feature value x, participants in a study are ...
1
vote
1
answer
43
views
How can I determine significant differences within factors and interaction effects?
My study is structured as such (false information, same idea):
Factor A: 3 levels (3 bacterial strains)
Factor B: 3 levels (3 antimicrobials)
Factor C: 2 levels (growth stage of bacteria: early, old)
...
0
votes
1
answer
28
views
advice on statistical method
I just want some opinions on the best way to analyse some data as I am not very savy with statistics.
I have been collecting abundance data for microbes in soil. Gene copy numbers.
I have two forest ...
- 21
1
vote
1
answer
43
views
Can statistical tests be applied to analyze temperature anomalies in vaccine refrigerators across different shifts and days?
Background:
I'm analyzing the vaccine refrigerator's internal temperature data collected during COVID pandemic (2021-2022) from all over an country. I measured the internal temperature of the 1077 ...
- 23
5
votes
3
answers
266
views
ANOVA with unreliable measure
I’m doing some literature review on sports science, in particular the effect of training on endurance.
There is no standard endurance tests. Some consist in intermittent contractions until exhaustion ...
- 151
8
votes
6
answers
733
views
Is it better to perform multiple paired t-test or One-Way ANOVA test
I have 7 patients with blood measurements from two different tissues and at two different oxygenation states. We first took measurements from tissue A and B (Normoxia) and then we administrated oxygen ...
- 201
1
vote
1
answer
89
views
Different p value from Wilcoxon and ANOVA
I got a different $p$-value from a Wilcoxon test and an ANOVA test. When I use the Wilcoxon test, the $p$-value is less than $0.05$:
...
- 11
3
votes
1
answer
57
views
Significant results from ANOVA post-hoc Tukey's, insignificant with welch-ANOVA post-hoc Dunnett's T3
I performed one-way ANOVA tests with post-hoc Tukey's to look at multiple comparisons and got highly significant results, but noticed the $F$-value on the ANOVA was high. The SDs in the groups were ...
- 31
3
votes
1
answer
75
views
Group comparison with multiple group memberships
I want to statistically compare personality scores between different groups, but people can be in multiple groups. Is there anything problematic in just doing an ANOVA or a t-test since a respondent ...
- 77
1
vote
0
answers
59
views
Welch ANOVA for Comparisons of Elevation & altered Sediment Accretion of Sea Ecosystems: Large DEM with no normal distribution & heterogeneity
I am investigating the elevation characteristics and sediment accretion effects of two distinct ecosystems within the Wadden Sea, impacted by the bioinvasion of one species (ecosystem one) and ...
- 11
0
votes
0
answers
39
views
Non parametric tests for 2 way anova and linear model? [duplicate]
My dissertation is due very soon and I have only just realised a large mistake in my work. I misread the normality test I used, which actually showed non normal data- but I still have homogeneity of ...
- 1
0
votes
1
answer
44
views
Test for significant difference between two groups measured across time
I have two groups of time-dependent samples whose measured value changes nonlinearly with time. There are 3 samples in group A and 3 samples in group B. An example of my data is illustrated below.
...
- 1
1
vote
2
answers
124
views
Significant interaction when only one of the two main effects is significant? [duplicate]
I have run a mixed effect logistic regression model, and I have obtained a significant main effect of Factor A, while no significant main effect of Factor B. However, the interaction between Factor A ...
- 175
1
vote
1
answer
48
views
What statistical analysis method should I use for two independent variables with interval data and a dependent variable with continuous data?
I'm doing a study on the potential of date leaf ash and date fruit seeds as replacement materials for cement and sand, respectively. For date leaf ash (DLA), there is 0% replacement and 5% replacement,...
- 41
1
vote
0
answers
22
views
ANOVA with variables with known (but arbitrary) conditional dependencies
I have a dataset with the following properties:
k > 2 groups
normally distributed
differing variance and sample size between groups
non-independent samples within each group
continuous variable
...
- 133
0
votes
0
answers
68
views
One-Way ANOVA for two groups VS. t test
When comparing 2 groups (K=2), we can either perform a t-test or f-test of One-Way ANOVA, because the f-test is equal the t-test squared(t^2 = f), it essentially goves the same resilt, right ?
Only ...
- 21
1
vote
0
answers
33
views
I'm struggling to find which is the right statistical test to use?
I have two variables: cell death and diet, but on the diet variable I have several groups that I want to compare. I was thinking of doing multiple Mann-Whitney tests, but that would be very time ...
- 11
1
vote
1
answer
151
views
Batch effect significance
I'm doing a project where i study bending angles in plants, with different genotypes and treatments. I have done the experiment 4 times, so i have 4 different batches. I'm trying to take into account ...
- 11
2
votes
1
answer
125
views
Statistical test for a biology experiment when plants were grown in 3 different solution concentrations
I have conducted an experiment for my Biology Internal Assessment in the IB Diploma Course where I grew Phaseolus coccineus beans for 14 days. This is the overview of my experiment:
Independent ...
- 21
8
votes
3
answers
1k
views
Non-significant results when running Kruskal-Wallis, significant results when running Dwass-Steel-Critchlow-Flinger pairwise comparisons
I am writing my Master's thesis on adult's performance on cognitive and linguistic measures. I have four age groups and am investigating if there is an age difference in the performance on summarized ...
- 91
1
vote
1
answer
37
views
Unsure of statistics needed while working with replicates
I apologize if the question is considered too broad, but I'm hoping to get at least a basic starting point as I'm somewhat stuck with how to approach this.
I am working with community ecological data-...
- 63
1
vote
2
answers
489
views
SIgnificant ANOVA but not significant post hoc ... what can I do?
I am analyzing some IHC data on the density of cells in two brain regions(factor 1) in two closely related species(factor 2). My data is composed of an n of 6 for each species and is not normally ...
0
votes
0
answers
70
views
Analysis of ANOVA Table to Determine Polynomial Degree
Using time-series data, I'm trying to determine the optimal polynomial degree to use for my regression. To do this, I chose to run an ANOVA test on 5 models, the first model's degree is equal to 1 and ...
- 11
1
vote
1
answer
28
views
How to quantify differences between sample means using ANOVA?
My problem is the following: I’ve run a one way ANOVA to test whether the means of my three samples are equal and found that there is a treatment effect. As far as I’ve understood, this only tells me ...
- 13
2
votes
1
answer
255
views
Discrepancy between the results of the ANOVA and the post-hoc test: How should be such results interpreted and presented?
It is possible to find discrepancies between the results of ANOVA and post-hoc tests. The results of post-hoc tests are valid (with the exception of the Fisher LSD test) even if the overall P value ...
1
vote
0
answers
56
views
Appropriate statistical test with pre\post experiment [closed]
This might be very simple so excuse me in advance. I'm trying to test if the difference between five test scores is statistically significant in a pre\post experiment with three different times, as ...
- 11
0
votes
1
answer
33
views
Abusing statistics- assessing the power of classification connection by flipping X and Y in a linear model
I am supposed to check the significance of the connection between an arbitary Y variable (nominal\ordinal\binary I cannot know in advance) and an arbitary numeric X variable.
This is a classification ...
- 101
1
vote
0
answers
28
views
did this paper make a mistake on anova?
The screenshot indicates that the lowest the score/value, the higher the fear level. In this case, a lower mean = higher fear, and higher mean = lower fear. Should it be that, Generation Y is ...
- 111
0
votes
0
answers
30
views
Read significance
I have a data file containg data like this. Here the angle can be seen as the severity of damage for all the species.
Now I did an Anova to see which factors are significant.
...
- 23
1
vote
0
answers
77
views
Choosing Outliers using Chauvenet's Criterion
I have normal data and have applied Chauvenet's Criterion to all my data points to determine if there were any outliers that must be removed. I have 2 groups of subjects, male and female, and when I ...
- 53
0
votes
1
answer
26
views
Scaling one set of data towards another for statistical significance
I have 8 sets of data. Each set, L, contains 3 samples, S.
L1-L4 were tested immediately, and L5-L8 were tested after 24 hours due to equipment shortages. Due to this and the nature of the test, ...
- 1
0
votes
0
answers
40
views
Advice on which statistical tests to perform in this scenario
I am trying to perform a couple of statistical tests to determine significance from categorical variables (e.g., treatment, station)
The experiment is microcosms with freshwater amended 2 different ...
0
votes
0
answers
28
views
ANOVA showing significance despite large variance within variables
I am looking for an intuition on why ANOVA indicates that the difference between two variables is significant although I see that the variance within each variable is quite large.
This is how the mean ...
- 141
1
vote
0
answers
30
views
The use of ANOVA for small sample sizes with prior knowledge of the population
I want to compare the response from three levels of one factor. I do lengthy and fairly expensive experiments, and cannot increase my sample size (often 3 measurement replicates on the same solution ...
- 133
1
vote
0
answers
66
views
Why is an alpha adjustment not required for factorial ANOVA?
When conducting a 2-way fixed effects ANOVA, there are essentially four null hypothesis statistical tests (NHSTs) that can reasonably conducted with just the ANOVA tables. The first is the omnibus ...
- 6,064
1
vote
0
answers
18
views
What formula does SPSS apply to the data in an ANCOVA? Or exactly *how* does ANCOVA adjust the dependent variable?
The procedure for an ANOVA is really straightforward; you compute the between group variance and the within group variance, divide your results to get an F statistic, and compare it to your critical ...
- 11
11
votes
2
answers
3k
views
Is it ok to run post hoc comparisons if ANOVA is nearly significant?
I ran ANOVA with dependent variable IQ, independent variable field of study (3 groups: science, humanities, business), and two covariates (age and sex). I see that my result is not quite significant, ...
1
vote
0
answers
44
views
F-test can be used to analyse discrete data?
I have 2 sets of discrete data. My objective is to compare 2 different process which is manual strip and auto-layering machine. But my data are in percentage of scrap. Can I use F-test to analyse the ...
- 11
0
votes
1
answer
15
views
Efficient way to compare 2 similar datasets
I am a grad student who is fairly new to all of this. I have a matrix likert table that I was wanting to compare across 3 different relationships to the land. I got the means and standard error for ...
1
vote
2
answers
39
views
Is there any way to compare the changes in the averages between two groups who are not entirely equal at the start?
RQ: analyzing the effect of completing a strenuous vs. more relaxing warm-up on reaction speed.
Methodology:
Randomly assigned the population to two conditions: complete a strenuous warm-up or a more ...
- 11
2
votes
1
answer
131
views
Different results for type I and type II ANOVA
I am performing an ANOVA for a research question. I want to to test whether "Grade", "Nim" and "Tim" has a significant influence on "value". My question is ...
- 23
1
vote
1
answer
105
views
Anova with a significant interaction term but non-significant main effects [duplicate]
I've just carried out an ANOVA on my data
My data is comparing juvenile abundance, based upon distance from the nearest adult A and another factor B
Based upon the output A and B are non-significant, ...
- 41
0
votes
0
answers
21
views
How to compare three conditions that are not from normal distribution?
Mice were exposed to light for 0, 1, and 4 hours. I have an algorithm that calculates their cell embeddings depending on the duration of exposure. As a result, violin plots of my data look like this:
...
- 149
1
vote
1
answer
81
views
Experiment design - response variable is a sum over a period, low power
I would like to run a statistically rigorous experiment, similar to that of an E-commerce A/B test.
I want to create a checkerboard of time periods where I alternate between treatments A and B. ...
- 11
1
vote
0
answers
137
views
How to assess the impact of confounding variables?
Recently I performed a comparative study where the participants had to perform different tasks using two different VR interaction methods: controllers and hand tracking. They also filled out a survey....
- 143
0
votes
1
answer
196
views
Appropriate ANOVA test for mixed factors, incomplete block design?
I conducted an experiment in which I timed participants completing various tasks, and I'm trying to figure out what factors influenced completion time and if that influence was significant (using R).
...
2
votes
1
answer
338
views
Which test to use with three variables? [closed]
that's my chart:
let's say that D0.5 was missing OJ. what statistical test could I use in this case?
- 23
0
votes
0
answers
63
views
Comparing apples and pears interactions in repeated measures anova
Suppose I'm running a 3x3 repeated measures ANOVA with the main effects of "Condition" and "Species": Condition (hat x neutral x glasses) Species (dog, cat, human). The experiment ...
- 111