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.

49 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
4
votes
0answers
1k views

How to choose between nested or split-plot analysis of variance?

I am having serious problems understanding the type of design I have, I would appreciate any help you can give me to understand it: I have 324 data points, and four factors: ...
3
votes
0answers
564 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 ...
3
votes
0answers
806 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 ...
3
votes
0answers
1k 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 ...
3
votes
0answers
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 ...
3
votes
0answers
831 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 ...
2
votes
0answers
34 views

How do I decide which experimental design to use in order to properly analyse the collected data?

I'm struggling to understand which experimental design I should use. I used factorial design in most of my experiment but i recently read a document where it mention that the precision of some main ...
2
votes
0answers
148 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 ...
2
votes
0answers
850 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 ...
2
votes
0answers
857 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?...
2
votes
0answers
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 ...
2
votes
0answers
451 views

Error bars calculation in a split-plot design

I have the following experimental design : Sampling is carried out on three random sites (Factor Site is coded : Site1, Site2, Site3). Within each site, sampling is carried out in a dry plot and in a ...
1
vote
0answers
30 views

Power, split plot designs, and mixed models

My teammate and I are trying to determine the best way to allocated limited resources (shade cloth and fencing) in an experiment. We are considering 2 factors: light availability (2 levels) and water ...
1
vote
0answers
31 views

No significance in the multivariate tests

Hope this question is not too stupid. I haven't taken the MANOVA course yet, but I need to figure out a problem right now. I am running a mix-model MANCOVA on SPSS. I have no significance in the ...
1
vote
0answers
27 views

Bayesian Split-Plot Design with heterogenous Variances / Kruschke / JAGS / ANOVA

I try to analyze a split-plot design and try to get my head around the code. My problem is that we were only able to gather a convenience sample of patients grouped into 11 different disorders at 2 ...
1
vote
0answers
95 views

How to code a two-way ANOVA with split-plot design using R?

I am analyzing a split-plot land-use experiment and I am stuck on the R code. We used four sites and on each site the following design: We conducted a full-factorial design with two factors (land-...
1
vote
0answers
48 views

Type of ANOVA to use: Split-Plot, Nested … or others? Water quality project

I was wondering if I could get some help in determining the correct ANOVA analysis to run on a water quality project in am working on. My dataset have the following variables: Habitat Type (fixed) (...
1
vote
0answers
36 views

Split plot with RBCD in R: Are inferences valid when output reports some effects are not estimable?

Data are from an agricultural experiment and are the proportion of turnips damaged by cabbage maggot in different insecticide treatments (note preliminary investigation suggested data were ...
1
vote
0answers
35 views

Experimental Design with two treatment levels, random effects, and technical constraints

I'm trying to plan an experiment and the experimental design is giving me headaches because it's too complex to wrap my only-statistics-101-capable head around. Basically I want to subject plants of ...
1
vote
0answers
49 views

appropriate error term for a randomized complete block design, possible split plot in time, with subsamples (in SAS PROC MIXED))

I am analyzing the results of an agricultural experiment, as follows: Plots are laid out in a randomized complete block design with 3 replications. They have been either conventionally or organically ...
1
vote
0answers
49 views

How to describe a split-plot ordinal logistic regression

I am having difficulties reporting a split-plot ordinal logistic regression. I get the concept of ordinal logistic regression involving a categorical representation of a latent continuous variable, ...
1
vote
1answer
30 views

DoE with correlated runs. Possible solutions?

I would like to create an optimal experimatal design (DoE) for a machine which will be used to produce 20 results in batch mode to find the most important factors which do have an impact on certain ...
1
vote
1answer
123 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 ...
1
vote
1answer
96 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 ...
1
vote
0answers
205 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 ...
1
vote
0answers
302 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 (...
1
vote
0answers
62 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 ...
1
vote
0answers
61 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 ...
1
vote
0answers
306 views

How to combine in a (fractional) factorial design model the blocking effect with a treatment (package planor)

For my greenhouse experiment with potted trees, I am planing a fractional factorial design. The experiment has six factors (treatments) each with two factor-levels, and I want to use a model/package, ...
1
vote
0answers
835 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 ...
1
vote
0answers
37 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 ...
1
vote
0answers
777 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....
1
vote
0answers
395 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 ...
1
vote
0answers
803 views

lme / lmer - split-plot with Non orthogonal subdesign

I have an agricultural field experiment (testing a plant protection agent): Split plot design with: ...
1
vote
0answers
92 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 ...
1
vote
0answers
1k views

Building a mixed model for multi-location split plot over 2 years in SAS

For the last 3 weeks I have been reading books, papers and internet sources incl. cross validated but could not find something that would work in my case. I have data from a split-plot field trial. ...
1
vote
0answers
751 views

How to determine the ANOVA table for split-plot with repeated measures experiment?

I have an experiment where observations are one of eight different treatment combinations and are then either one of two different heights. There are 4 blocks, with 8 plots for each block, and the two ...
0
votes
0answers
15 views

It should be analyzed as Split-plot design or split-split plot design?

I have a field experiment with 4 blocks as shown in figure (1 block shown). I want to see the effects of Plant desity, spacing and irrigation. I am not sure how to analyze it. Should it be treated as ...
0
votes
0answers
12 views

What is the correct data structure for a Split-Plot design?

I was reading about split-plot designs and found some references that say the blocks (i.e. main plots) are 'nested' within the main plot treatment factors (left), but other references that say the ...
0
votes
0answers
15 views

Unbounded variance components for split-plot, RCBD, repeated over several years

I have a Randomized Complete Block design with 2 factors, replicated over 4 blocks and repeated over 4 years. Each block has 9 plots and each plot is divided into 2 subplots. The main-plot factor has ...
0
votes
0answers
8 views

Planned contrasts in split-plot experiment

In a split-plot experiment, is it appropriate to use contrasts to compare mainplot-subplot combination treatments? And if so, how might I calculate the standard error of the contrast?
0
votes
0answers
17 views

Split (and split-split) plot design in G*Power

I am trying to see whether I can use G*Power as a tool for estimating sample size for split-plot and split-split plot experiments. To be specific, consider the case of 2 blocks or plots. Each block ...
0
votes
0answers
7 views

Is it possible to use path analysis on data from split plot experimental design?

Assuming that the two treatments of a 3x2 factorial design study are dependent on one another (to some degree), is it acceptable to use a split plot experimental design? Alternatively, is it possible ...
0
votes
0answers
9 views

R Library for Ordinal Regression with Split-Plot (Cluster?, Repeated Measures?) Structure

I have a data set with the following structure. The response is ordinal. There is an experimental factor (with two treatment levels, each treatment level applied to a different sample of subjects). ...
0
votes
0answers
38 views

Split-Split-Split Plot Design

I have an experiment which was set up as a split-split-split plot design and repeated the experiment a second year. 2yrs x 4 reps x 2 levels of Factor A X 5 Levels, of factor B X 2 Levels, of Factor C ...
0
votes
0answers
35 views

R: vegan/permute: additional level of nesting for pseudoreplicates in a split plot

I am trying to investigate how to set up a permutation scheme for community data originating from a split plot experiment with pseudoreplicates at the lowest level. A theoretical design could be the ...
0
votes
1answer
51 views

significance tests for mixed models?

I have a two-factor split-plot design experiment looking at biomass across a large region and in the presence or absence of fire. Biomass is measured in 5 different forests and each forest has two ...
0
votes
0answers
25 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 ...
0
votes
0answers
34 views

Constrain a number of factors in Design of Experiments

I have multiple factors with multiple levels, for which I am trying design of experiments. Here is an example: ...