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Questions tagged [split-plot]

An experimental design used in situations where one factor can be changed more easily than another one. It's also called "mixed design" because it involves between-subject (hard to change) and within-subject (aka repeated measures; easy to change) factors.

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19 views

Cohen's d in split-plot experiments

There is some demand for effect-size measures in doing post hoc analyses, and I am trying to decide whether to provide for this or not in an R package of mine. If I do, I would concentrate on Cohen's \$...
15 views

How to perform FrF2? [on hold]

I'm about to perform an experiment therefore I want to use FrF2 to construct a proper experiment design. 2^6 would be a full factor design (without repetitions and replications). So far, my goal is ...
15 views

How to study split-plot design

Is it possible to study a split-plot design with a mixed model? I've seen a related question so I guess it is doable in general. Is there any certain function or procedure I can use? Or can you give ...
38 views

Split split plot: defining expected Mean Square error term for calculation of F values

Note: my endgoal concerns multivariate analysis but I do not believe my question is specific to this setting Motivation: the RRPP R package allows to analyze composition data (i.e. multivariate) ...
41 views

Split Plot Analysis Interpretation

This is the R output I was given for a split plot analysis. I think I'm on the right track with my interpretation, but I want to make sure. Q1: What should you look at first? If the treatment*year ...
52 views

Repeated measures ANOVA in R (split-split-plot design)

I am trying to fit a repeated measures ANOVA from an experiment with a split-split-plot design and several measures over time. The experimental design is as follows: I have 9 blocks in the field. ...
165 views

Split split plot ANOVA table: r = replicate or block?

I have seen various ANOVA tables for analysis of split split plot designs, and some have the first term ''r'' defined as the block while others have it as the replicate. This is confusing to me, as ...
71 views

Existing very detailed derivation of sum of squares error for split-plot ANOVA?

Since a few years i'm trying to group all very detailed derivations of all (very common) existing ANOVA in a document. For some it's a real pain in the a** to do this work. Now i'm near an ...
163 views

What is the difference between a mixed-design (split-plot) ANOVA and a linear mixed-effects model?

My understanding is that in a mixed-design ANOVA, the between-subjects is the fixed effects factor and the within-subjects variable is the random effects factor. Not sure if that is any different from ...
215 views

Interpretation of R output for mixed ANOVA model

I had to do a mixed ANOVA. How can I interpret the results? Power (high power / low power) is the within factor. interaction (...
427 views

Do Likelihood Ratio Tests “respect hierarchy” in linear mixed models?

The following example from the JSS paper on pkbrtest shows an LRT meant to test for the effect of the whole-plot treatment (harvest): ...
2k views

Random Effects Design Matrix

I'm trying to move away from ANOVA/t-tests and get a better understanding of GLMs. I am doing my statistical analysis in R using function lm (only fixed effects) and lmer (+ random effects). I also ...
460 views

Split plot in time mixed-effect model in R

I am new to this website, to r, and to mixed effect models so apologise in advance if I exhibit a degree of ignorance. I am looking for help of how to fit a model for an experiment that I have done. ...
80 views

Generate Grouped Data with Exact Correlations, Means, and SD

I want to generate data with the following constraints. There is one factor and two numeric variables. Note that the desired mean structure is broken down by factor, which is what makes this a ...
301 views

Setting up a mixed model or a split-plot ANOVA for an experiment with male/female fishes in replicated tanks

I am designing an experiment with juvenile fishes. There are 12 replicated tanks. In each of the first 6 tanks there is a even mix of male and female fish (100 of each sex in each tank); 3 of these ...
58 views

Is it possible to have covariates for different tasks within an split-plot analysis?

I am conducting an experiment which looks at between-within subjects. There are two groups (participants will either use an iphone and android in the experiment) and they both have 4 short tasks to ...
19 views

Transformation of raw-scores to proportions for a split-plot ANOVA

I have performed a 2 x 2 x (2) split-plot analysis on raw scores of a questionnaire. The questionnaire was taken twice by participants, once before and once after the intervention in question. A ...
58 views

Split plot analysis

I am analyzing my experiment and I have encountered a doubt. It is a split plot design, agriculture experiment where main plot is received four different treatments (incl. control) and four subplots ...
434 views

Mixed model random-effect structure for repeated measures, split plot design in R (nlme or lme4)

I am seeking advice on structuring the random-effects component of a mixed model in R. The data that I am modeling come from an ecological experiment with a repeatedly-measured split-plot design. At ...
554 views

Mixed model for three factors (split split plot design) with proportions as response

I am struggling with the analysis of a data set from an experiment done as follows: I have 5 blocks (that work as replicates) and each one of them was divided into two part (so split block), to each ...
666 views

How to interpret the split plot anova result? Please explain to me about split plot anova

I'am analyzing an artcle , it said that split plot anova was conducted to asses the impact of two different interventions on student scores on achievement test, across two time period (pre ...
34 views

How to manage time dependent factors in design of experiment

I am designing an experiment in a semiconductor context. Briefly: the performance (i.e. etched material) of a tool (CMP - chemical mechanical polishing) used in the manufacturing of silicon wafers ...
452 views

Repeated measures on split plot design with blocking

This is the first time I'm posting a question here. I have regularly been using the questions and answers here as example solutions for my problems, and searching has always helped me figure things ...
633 views

Experimental Design: Split Plot with 2 whole plot factors and 1 subplot factor. Understanding Error Terms

I usually have a little bit better experimental design, but this experiment has already been planted and can't be changed. Instead of being a true split plot design, in which case I would use ssp....
120 views

Is it possible to compute some measure of effect size from four means from a split-plot (both within- and between-subjects) 2x2 design?

For a meta-analysis, we are interested in the comparison of two groups. From the articles, we can extract four means: two baseline measures on one of our dependent variables, and two measures ...
836 views

Split-plot analysis with four factors in SAS

I'm trying to correctly model a split-plot design with more than two factors (specifically, four) in SAS. I'm interested in an example from Design and Analysis of Experiments (Montgomery , 8th Ed.), ...
367 views

Repeated measures assistance needed

Disclaimer - I am not particularly adept at stats and have a relatively complicated design. I apologize in advance for my ignorance. Looking forward to any help I can get! Here goes... I have 2 ...
38 views

How to define a between variable is random effect in Anova in R? [closed]

I am using 'Anova' function in 'car' package to analyze plot - split experimental data. I have 1 between group, and 2 within group variables, so it is SPFp.qr analysis. The problem is, the between ...
590 views

Mixed-design ANOVA or one-way ANOVA with delta values

I have an experiment with one independent variable with 4 levels (4 different treatments) and 1 dependent variable which was measured twice - before and after the treatment (repeated measures). I ...
946 views

ANOVA table for 4-factor split-plot

Hopefully I can explain this clearly. Reference diagram below if needed. I'm planning a large field experiment that I think will have to be a split plot design. There are six sites (outlined in red)...
805 views

Split Plot Design? lmer analysis

I need advice regarding the analysis of a project that I am working at the moment. Here the picture of the experiment: We have an RCBD with four blocks. Within each block there are 5 plots. Each plot ...
47 views

What is the difference between a 2x2x2 split plot ANOVA and a 2-way repeated measures ANOVA? [duplicate]

What is the difference between a 2x2x2 Split-Plot ANOVA and a 2-Way Repeated Measures ANOVA?
722 views

Repeated measures anova and split plot design analysis

It is mentioned that repeated measure anova may be very similar to split-plot design: Is a "split plot" ANOVA with two factors the same as two-way ANOVA with repeated measures in one factor?...
688 views

Specifying a model with nested subsamples within split-plot design

I am trying to specify a model for split plot design that acknowledges nested sub-sampling. Split plot designs are a little bit tricky to analyze, and I am new to R, so I provide my dataset along with ...
2k views

Single column plot in r versus gnuplot [closed]

I am new to R environment. I have created a simple data set as shown below. 1 2 3 7 8 9 I simply plotted this data using both gnuplot and R. Command ...
608 views

Split Plot ANOVA in R

I have an experimental design in which I am comparing two or three types of soil (depending on how I group them) across two elevation transects. My overall goal is to compare different soil types, but ...
2k views

Split plot with factorial design vs three way ANOVA

I have three site temperature types: cold, medium, and hot. This is a fixed effect - I am specifically am testing if temperature affects my response variable. I believe temperature type is my 'block'. ...
9k views

What can cause a “Error() model is singular error” in aov when fitting a repeated measures ANOVA?

I have the following data set: ...
742 views

Tests of within subjects contrasts in R

I have run a split splot model in SPSS (via repeated measures function) and I would like to reproduce my results using R. To do so I used ezANOVA function from ez package to obtain sphericity tests ...
765 views

lme / lmer - split-plot with Non orthogonal subdesign

I have an agricultural field experiment (testing a plant protection agent): Split plot design with: ...
91 views

Is this a split plot?

I have attempted to view the following experiment as a split plot design: 15 undergraduates serve as subjects for an experiment that compares two hypnosis methods. There are two phases to the ...
721 views

Mixed-design with split-plot and mixed effect

From Wikipedia: a mixed-design analysis of variance model (also known as a split-plot ANOVA) is used to test for differences between two or more independent groups whilst subjecting participants to ...
552 views

Understanding the split plot

Can someone explain me the intuition behind the split plot? From what I understand, it is essentially restricted randomization. But I still do not quite understand it. Is there a resource or example ...
1k views

Analyzing split-plot design in lme4 in R

I have the data from a split-plot design where A is my whole plot fixed factor with two levels and B is my subplot fixed factor with 2 levels and C is my random block factor. How do I analyse these ...
4k views

Nested/SplitModel - RepeatedMeasures/MixedModel ANOVA: levels of nesting & scripting in R

My data set has the following variables: Treatment (4 types- fixed) Location (8 locations- fixed) Position in Location (3 positions per location- fixed) Samples are taken in each position (3 samples ...
771 views

Is my design nested or split plot?

I have a design with four factors: Frame (positive negative neutral) Graphic ( graph no graph) Color (red grey) nested in graphic Position of color (nested in color, which is nested in graphic) I am ...
785 views

Split-split-split plot cross-over design… is this even possible?

I'm doing statistical analysis on a psychology study I ran a short while ago, and I'm starting to think that I've designed myself into a corner. In the study, we measured participants' pointing ...
1k views

Split plot design with repeated measures in package (nlme) - model errors

Forgive me if this answer is already somewhere on this site, but after extensive searching I have found nothing to help me. Here is a brief overview of the experiment: I have 18 tanks, each of which ...