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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15 views

Multiple comparisons after two-way repeated measure ANOVA?

I have got a dataset with 50 sample units out of which a certain quantity has to be modelled by a new measurement method. Therefore I want to compare 5 different measurement devices (device 1 to 5). ...
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27 views

What are the differences between determining 'interaction' via Two-way ANOVA vs. testing against simulated expected data

In biology, we often want to test whether an observed phenotype in a mutant background of two genes A and B is significantly different from what one would expect given the phenotypes of genes A or B ...
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Differences between nested ANOVA and two-way ANOVA, without a repeated measures structure and a small number of levels per factor

My question is rather simple, and it's not so much about R, but about how to analyse a very simple dataset. I have 6 sites, and 2 ecosystem type (3 sites per ecosystem). From each site I have 3 ...
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8 views

Partially crossed two factor experiment: Model choice and inference

I have data from an ecological experiment featuring a partially crossed design. The experiment manipulated air temperature (3 levels: T1, T2, T3) and precipitation (2 levels: W1, W2). However, the ...
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1answer
18 views

Two-way ANOVA: does the interpretation of a significant main effect apply to all levels of the other (non sig.) main effect if no interaction effect?

I need clarification re how to interpret the results of a two-way ANOVA modelled with an interaction effect. My results suggest that the interaction effect is not significant, and that only one of my ...
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15 views

Generalized DiD - Should I drop States which are treated before my sample data begins?

I am estimating the effect of a law change on certain policies for the US states. The time period for my dataset ranges from 1980-2017. My treatment variable is a binary variable that indicates the ...
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1answer
29 views

What Statistical test would be most appropriate for comparing death counts by age in two populations?

I am not a statistician by any means, and am new to this. I have "patient" level data that has a persons death status, age, and gender. I want to compare it with the general population ...
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13 views

Two way ANOVA of repeated measures vs ANOVA of differences

I have an experiment with 150 individuals divided into 3 treatment groups (1 control, 2 different treatments). To these patients we did some psychological tests at 3 time points (before treatment, 8 ...
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14 views

How to control the family-wise error rate testing simultaneous hypothesis in two-way Anova?

I guess explaining with an example would be best. Let's say we are researching which type of fertilizer and planting density produces the greatest crop yield in a field experiment. We assign different ...
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6 views

Repeated-measures design with correlation as the outcome variable

I have a data set which measured the same sample of participants for a set of two variables (stress and coping) at four time points. I'm looking for a way to measure the effect of time as a repeated-...
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28 views

One-way ANOVA and Two-way ANOVA p-value

I have a dataset with 270 observations, 90 for each group (A,B,C). With One-way ANOVA I'm testing if there is a difference in my variable y depending on each one of the groups A,B and C. ...
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12 views

Number of planned tests using Bonferroni for a two-way ANOVA?

I have a two-factor study with factors A and B. There are 4 factors of A and 4 factors of B, with a replication of 3 for each. $$a = 4, b = 4, n = 3$$ After looking at the ANOVA table, I can see that ...
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47 views

How to estimate the source of variation in R? (For two-way ANOVA)

In my laboratory we used a statistical software, but now we are using R for the statistics. Using the statistical software, after a two-way ANOVA, a table with the results includes "Source of ...
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47 views

Two-way ANOVA test in R

I have some measurements of 14 animals in control group and 12 animals in treatment group (10 weeks old). After 4 weeks we repeated those measurements but most of animals have died. I left with 5 ...
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8 views

Different Results betweeen Pairwise subsampled by Factor OneWay Anova and Two-Way Anova

I have been testing 4 different groups, Control/TestNotOpen/TestNotClick/TestClick on a continuous variable: Withdraw Value. I have a factor to consider: policySegment which can assume 3 values I have ...
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14 views

How to calculate the error terms in mixed ANOVA?

I recently came across this question and just couldn’t figure it out. I have to derive a ANOVA table from the following data: B1 B2 B3 A1 35 32 29 A2 29 28 27 A is a between-participants IV with 2 ...
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17 views

Individual effects in two-way ANOVA in R

I have a 2b x 3w factorial design with a continuous DV. The between factor is 'gender' (so 2 levels), the within-factor is the 'group' (3 levels). I have measures for each individual (male and female) ...
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9 views

two-way repeated measures ANOVA and long_db format

Good morning everybody Here I show a dataset I'm performing a statistical analysis on. Aside the meaning names of most remarkable variables are indicated: ...
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1k views

Does two-way ANOVA still works fine with unequal sample sizes?

I want to test if installing a new technology (with two different versions) can reduce water waste. I'll test the following: no installation (control), installation of new technology (version 1), and ...
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1answer
39 views

Is normality assessed in each individual group or for the entire dataset in repeated measures ANOVA?

This is probably a stupid question, but somehow I got very confused and so far I could not find a clear answer (there might be no clear answer). I have residue data in 4 different plant matrices (eg ...
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38 views

Two ways ANOVA does not show the interaction between the variables [closed]

I am doing a two-way ANOVA and I want to examine the interaction between two variables. The variables are the following: STS (Sign language knowledge) and Hearing (if they are hearing or deaf). Both ...
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1answer
340 views

How to calculate sample size for blocked-design two-way ANOVA?

Does anyone know of a good online calculator or at least a good paper that details how to calculate the needed sample size for a blocked-design two-way ANOVA experiment? I've seen a ton of references ...
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1answer
46 views

Two- or One-Way Anova?

I am having a question regarding a statistical analysis I am conducting. Let's say I have a continuous variable that I measure (Plant Weight) and I have 2 factors with 2 levels (sufficient watering/...
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1answer
25 views

Which ANOVA should I use?

Let's say I have a problem where there are two distinct groups, and within each groups, there are two more groups, leading to a total of four groups. So it's something like this: I want to run five ...
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2answers
190 views

one-sided t-test after a two-sided t-test?

I have two groups and I conducted a two-sided $t$-test. mean group 1: 3.79 mean group 2: 4.07 $p$-value: 0.0081 The $p$-value is less than $\alpha$ = 0.05, hence, I can reject the null hypothesis of ...
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40 views

How can I get LSDV estimator of a two-way dynamic panel model?

I am now trying to explain a dynamic panel data model as follow: $y_{it} = \alpha y_{i,t-1} + x_{it}'\beta + \mu_i + \lambda_t + \nu_{it}$ Here I want to compute its LSDV estimator $\tilde\beta$, ...
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1answer
26 views

Can I do a hypothesis test to see if two populations are different if there are known subpopulations within the data?

I have a continuously variable output (diffusivities) that I have measured from two different populations (say "Case 1" and "Case 2"), and I am trying to see if the two populations ...
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21 views

Calculating alpha level for Bonferroni

I have 4 null hypotheses. I want to conduct 4 two-way mixed ANOVAs (one between-subjects factor and one within-subjects factor) for each of my 4 dependent variables. I will use the same between-...
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1answer
24 views

My Design defines the Hypothesis test?

a conceptual question appear in my mind and i need help, in pratical therms, whats defines the statistical test its my hypothesis and my experimental design ? Using this example, if i am interrested ...
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1answer
233 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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1answer
112 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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2answers
58 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
67 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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2answers
1k 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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1answer
35 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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1answer
181 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
131 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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1answer
43 views

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
312 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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1answer
148 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
2k 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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182 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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2answers
446 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
416 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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0answers
778 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
157 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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2k 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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518 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
721 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
645 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 ...