Questions tagged [two-way]

For statistical models or methods used to study the effects ow two variables simultaneously, see https://en.wikipedia.org/wiki/Two-way_analysis_of_variance

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6 views

pureErrorAnova(alr3 package on R) would work for two-way factorial anova

I have a balanced 2x5 anova factorial which 4 replicates each group. I'm trying to check the Lack of fit and I came accross the pureErrorAnova - alr3 package (Im using R software). My independent ...
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19 views

Can we use `two way anova` when factors have interaction?

You should have independence of observations, which means that there is no relationship between the observations in each group or between the groups themselves. Above sentence come from https://...
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9 views

Two-way or three way repeated measures ANOVA with replicates

I have tried to read some papers about two-way ANOVA and repeated measures ANOVA but I just get more confused the more I read. I have a BACI study design where I have investigated 12 stations. I have ...
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11 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: ...
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42 views

Interpreting interaction from two-way anova table

I've conducted three pairwise comparisons of variables and the results were as below: ...
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1answer
38 views

Kronecker product for two way error component model

The two way Error Component Model defined as $$y_{it} = \mathbf x_{it}^\top \beta + \mu_i + \lambda_t + v_{it}$$ for $i=1,...,H$ and $t=1,...,T$ can be written in matrix notation using kronecker ...
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22 views

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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14 views

Determining Significance in AxB Anova with repitition

I am looking to understand how the best method of determining the individual significant between my interactions would be calculated in a Two Way anova with repetitions. Based on the results of the ...
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8 views

Segmented regression analysis wherein the breakpoints differ by variable level

I have some electrophys traces. Like many such traces, there's a leap, a bend, a gradual decline, a faster decline, then back to baseline. I'd like to do a segmented regression comparing interaction ...
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140 views

How to approach unbalanced data with unequal sample sizes for comparing means

I have a data with a continuous and two categorical (population and sex) variables. I want to test whether the means among the groups are significantly different. However, this is not an experimental ...
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31 views

Brown-Forsythe Test on Unbalanced Two-Way ANOVA

I am trying to create code in Matlab that runs a Brown-Forsythe test on an unbalanced two-way ANOVA. I am having difficulty figuring out the actual math behind this test and how to do it. I have read ...
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11 views

Is a two-way mixed design anova suitable for the interaction and differences between two conditions and two question types?

I want to look at the interaction and differences between the reaction time (RT) of two conditions and two question types. Each subject reads a story (digusting vs. control) and responds to the first ...
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30 views

Two way ANOVA when one independant variable is not Categorical

I am doing a test on doctors' training level and the number on duty. One IV is training level, the other IV is the number of doctors on duty. The DV is the number of patients seen. There are two ...
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32 views

Two way analysis of binary data (repeated)

I have a data set that is measuring a yes(1)/no(0) outcome across six time points and under two conditions. We have 15 participants that completed all time points under the two conditions. Disclaimer;...
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1answer
43 views

R survey sackage method for replicating SUDAAN proc crosstabs SEROW [closed]

I have been using SUDAAN's proc crosstabs to generated weighted crosstabs, percentages, and standard errors for counts and percentages. I'm trying to replicate this functionality in R and have gotten ...
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What is the difference between the measurement, and within subject factor fields is in SPSS (two-way repeated measures ANOVA)?

First, I am sorry if this seems very silly, but this is the first time I do any statistical analysis. I did a study with 10 subjects and I have a couple of questions regarding the statistical ...
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1answer
65 views

Comparing proportions of two samples in time

I am trying to compare if the proportion of one bird subspecies in a roosting area is different now from over 20 years ago. My dataset looks like following: -In 1996 birds were counted at a ...
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59 views

Homogeneity of variances but non normal residuals of a two way ANOVA

I have a problem, actually two. I am doing a bunch two-way ANOVAs and some of them can't fullfil the assumptions, no matter what I transform the data to. Question: Does there exist a suitable non-...
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1answer
526 views

Dummy variables in two-way ANOVA

I do not understand how to use dummy variables and the statistics underlying them. I don't need to apply this or use it in SPSS or any software. I do know that they can be used for categorical ...
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69 views

Two way ANOVA with percent change

I have two groups of animals: "active cycle" and "inactive cycle". Within each group, there are two groups: "control" and "treated". I measured the levels of a specific receptor for each animal in ...
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103 views

A two mixed ANOVA showed no significant interaction, but showed a statistically significant main effect of time, Do I need to run a paired T-test?

I did a mixed ANOVA with one within subjects factor with two levels 'time' and one between subjects factor (control + intervention). Its a comparison between INT or CON on scores pretraining and ...
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1answer
203 views

Help in Two-way ANOVA with Significant Interaction

I got the following results for an experiment of fermentation to produce Butanol: ...
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305 views

r - How to use Aligned Rank Transformed ANOVA for 2x2 non-normal data?

I'm a complete novice to stats and r so kindly bear with me. I'm testing to see if the moisture content in two plants (p and s) is affected by heat (cold and warm). The 2x2 factorial data mandates a ...
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1answer
66 views

Are these the correct residuals to test for normality for a within-subjects 2-way anova?

I have data of an experiment where subjects performed a task under 4 conditions (A1B1, A1B2, A2B1, A2B2, where A1/A2 are the levels of factor IV1 and B1/B2 those of ...
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998 views

Understanding, reporting and post hoc testing a 2x2 Mixed ANOVA

I one dependent variable, one between groups independent variable (intervention vs. control) and one within groups independent variable (time1 vs time2) so I am using a 2x2 mixed ANOVA. These are my ...
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136 views

What statistical test should I use for moderation?

I am hoping to test an interaction effect, though being new to statistics/quant research in general, I am a little unsure as to which test would be most appropriate. I have read around using ...
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1answer
291 views

Unbalanced Two Way ANOVA

I am attempting to finish my stats on my Master's thesis and am having difficulties with which statistics test I should be using, and how to go about doing so. I have collected chl-a samples at 15 ...
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1answer
340 views

Biostats two way anova in R boxplot visualisation

I am having a problem analyzing some data from a recent experiment in R. The experiment was balanced with 5 replicates in each group. It included two factors (plant type and leaf age) with 15 ...
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37 views

Significant interaction in Mixed-design 2-way ANOVA. How to correct for multiple comparisons?

I have conducted a mixed-design two-way ANOVA (between subjects variable : 2 levels; within subjects variable : 8 levels). I have a significant main effect of between and within subject variables and ...
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1answer
54 views

Post hoc analysis after two-way repeated measures ANOVA

I am measuring test performance at 10 different timepoints, before and after drug application. So far I ran two-way repeated measures ANOVA and determined there is a significant timepoint, drug, and ...
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1answer
55 views

Two way ANOVA, no difference between tests based on type I vs type II sums of squares

I'm learning about two way ANOVA possibly with interaction. I'm following this tutorial http://www.sthda.com/english/wiki/two-way-anova-test-in-r This is their code. ...
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19 views

Which statistical test to compare between and within differences?

I have two groups of patients with two different treatments applied, Treatment A vs Treatment B. In addition, I have measurements on 4 different time points for an ordinal variable (scale 1 to 4, ...
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1answer
46 views

Two-way repeated measures anova using a “categoryish” independent variable?

I am trying to run a two-way repeated measures anova in spss but i think my data needs restructuring. I have run anova's in spss before so i am familiar with process. The problem is that when i have ...
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1k views

Understanding the Anova (car package) output in r

I am running a two-way anova test using Anova from car package. My data looks like this: ...
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38 views

Mixed-Design ANOVA Confusion: Do I separate my treatment Column?

In this particular study, I had 40 experimental subjects which were randomly allocated to 2 treatment groups. After the initial treatment, each where randomised to receive 2 other treatments. So the ...
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49 views

Refitting the ANOVA model?

I have performed a Two way ANOVA, for one response and two categorical variables. I had found that EDA with a plot of means shows that there might be an interaction between my categorical varibles ...
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How to analyze non-normal DVs from two-way repeated measures (4x4) design

In my study twenty subjects experienced all four levels of both factors (4x4 design). The residuals for my DVs were not normally distributed as would be required for the two-way repeated measures ...
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49 views

Is Kruskal-Wallis the right test?

I'm writing a research protocol and trying to work out the right test. Is there a significant difference between the success rate (dependent variable, ratio data) for different repair materials (...
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30 views

I need help to specify a two-factor mixed effects model with repeated measures (temporary pseudoreplication)

I performed an experiment with two factors, the first factor was the glyphosate concentration with three levels and the second factor was the soil depth with two levels. For each treatment I have four ...
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105 views

Post-hoc tests for two-way ANOVA on data with only two levels in each variable?

I sampled women and selected 30 high conformity women and 30 low conformity, matched for age, weight and activity level amongst other things. I split each group into half, with half on an exercise ...
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2k views

When do I use two-way mixed, two way random and one way random for the Intraclass correlation coefficient?

I have a question about the intraclass correlation coëfficiënt. I have 62 patients for whom I calculated the breast tumor volume. The surgeon who resected the tumors did the same thing, but without ...
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39 views

What statistics to use and How for “difference in differences”

There may be similar questions posted earlier but I am a novice for statistics and cannot discern them from mine, so I am posting my question as it is. What statistics can I use and how to use it (...
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56 views

2 way anova or mixed design anova?

I am a Performance psychology student and previously have very little experience with statistics. I gave an 8 week intervention to 15 students. They were tested 3 times, pre course, mid course and ...
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101 views

Homoscedasticity and normal distribution on proportion data - beta regression necessary?

I have a couple of datasets with proportion data. For some datasets the values are nicely normal-distributed and show homoscedasticity. Is it fine to run a two-way ANOVA or Scheirer-Ray-Hare test? Or ...
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1answer
538 views

ANOVA or Multiple t-tests for comparing multiple organs in two mice groups

I am comparing two mice groups (1 experimental and 1 control) but I obtain data from 4 different organs of these mice. When I order my data (using GraphPad Prism) I use a grouped table and graph to ...
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1answer
272 views

Significant interaction: both simple effects tests significant?

I'm reviewing a paper in which there are two independent variables (A and B), each with two levels (A1 and A2; B1 and B2). There is a significant two-way interaction. The authors ran simple effects ...
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1k views

One-way ANOVA or two-way ANOVA for more than 10 independent variables and 1 dependent variable?

I want to do an analysis where my model contains 1 dependent variable which is continuous (eg. SCORE of respondents) and around 10 independent variables (eg- Age, income(continuous), Gender, disease ...
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356 views

Are these factors considered random or fixed factors?

I am in a little bit of a mix right now regarding this scenario right here. Assuming I have a 2x3 design, looking at the effects of: Two mood-inducing conditions: Happy Neutral 2.Three levels of ...
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1answer
357 views

2-way ANOVA main effects vs interaction effect issue

I have an experimental design with 4 groups: (1) Controls, (2) Treatment A, (3) Treatment B, and (4) Both treatments A and B The data looks like this: In this experiment, I want to know what ...
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188 views

2x2 anova: one main effect significant, other main effect and interaction are not

I was wondering what to do in this situation. I wanted to check for interaction between two IV's on the DV. First IV is gender, second musicianship (Yes/No). Only one (musicianship) main effect is ...