split-plot is a special design from statistical design of experiments, used in situations where, for various practical reasons, different treatments used in the design needs different-sized plots.

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How do I test the parametric assumptions of a split-plot ANOVA?

I have an RCBD split-plot experimental design for testing the effects of drought, tillage, and nutrients on plant biomass: Block = random factor (2 blocks of 10 plots each, total 20 plots) Drought = ...
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8 views

Is it possible to get an interaction in Split Plot ANOVA (p = .02) and at the same time get a profile plot for estimated marg. M with no interaction?

In Split Plot/Mixed Design between-within (2by2 ANOVA with 3 DV) I got a significant interaction for one of my DV at F(1,196) = 5.467, p = .02. But when checked a profile plot for estimated marginal ...
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14 views

Correct model for mix of nested and split-plot design in R?

I'm struggling to create the right model to analyze the treatment effects on my response variable in a recent field experiment. I believe I have a somewhat confusing mixture of nested and split plot ...
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52 views

Split-Split-Plot or nested ANOVA using lme

I have a simple design but I do not know how to handle it. I have a nested anova (or a split-split-plot anova). I have three grazing treatments (Grazing, coded as Gra1, Gra2, Gra3), replicated each ...
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17 views

Bamboo Plot Design

I want to establish a research plot for Bamboo plantation. The factor the plot/research are 3species of Bamboo, 3+1(control)Fertilizer content and 3different distance of planting. Can anyone suggest ...
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55 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 ...
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1answer
89 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.), ...
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18 views

Effect of tillage, mulching and weeding on arthropod abundance

I have a designed split-split-plot experiment in which I am using tillage the main-plot factor with 3 levels, mulching as a sub-plot factor with 4 levels and weeding management as a sub-sub-plot ...
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21 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 ...
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28 views

How to analyze split plot designs using SAS

I'm trying to improve my knowledge of SAS, as well as statistics, and understanding this example would help me to do both. In an agricultural study, a rectangular field is divided into two ...
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38 views

What is the relationship between a split-split plot and subsampling?

I am working on a 2 x 2 factorial experiment that has been monitored longitudinally for 10 years that I believe is a split-split plot design because of the way that it is sub-sampled. I have 6 ...
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23 views

Nonparameric mixed (split-plot) anova in SPSS?

All, I have a 4-within x 2-between split-plot (i.e., mixed ANOVA) design with data that are not normally distributed. The DV resembles count data, with mostly zeros and decreasing numbers of 1s, 2s, ...
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1answer
82 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 ...
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1answer
214 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 ...
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86 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 ...
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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?
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120 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 ...
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1answer
104 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 ...
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1answer
397 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 ...
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1answer
40 views

Sample size for group comparison

I am collecting data from 3 different population groups (islands) and within each, comparing children from class 1 from 10-14 schools between two groups - those who completed kindergarten, those who ...
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1answer
115 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 ...
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1answer
763 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'. ...
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2answers
4k views
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1answer
311 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 ...
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668 views

lme / lmer - split-plot with Non orthogonal subdesign

I have an agricultural field experiment (testing a plant protection agent): Split plot design with: ...
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79 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 ...
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663 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 ...
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3k 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 ...
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1answer
248 views

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) ...
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622 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 ...
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682 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 ...
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1answer
6k views

How to interpret an interaction effect in SPSS output for a repeated measures anova with between and within group factors?

I have conducted a repeated measures ANOVA, with 2 factors: One between factor (Ex_control: exercise intervention versus control) One within factor (...
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543 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. ...
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939 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: ...
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347 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 ...
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497 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 ...
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1answer
3k views

Split-split-plot design and lme

I’m working on a data set in order to evaluate the impact of drying on sediment microbial activities. The objective is to determine if the impact of drying varies among sediment types and/or depth ...
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2answers
5k views

Is a “split plot” ANOVA with two factors the same as two-way ANOVA with repeated measures in one factor?

Is a "split plot" ANOVA with two factors identical to two-way ANOVA with repeated measures in one factor? if not, what is the distinction?
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1answer
8k views

Split plot in R

I have a data set of $n$ benchmarks and $m$ subsamples in each benchmark. I run these benchmarks and their subsamples on $p$ subject machines. The 'individual' studied by the subsamples are the same ...
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2answers
5k views

Split-Plot ANOVA: model comparison tests in R

How can I test effects in a Split-Plot ANOVA using suitable model comparisons for use with the X and M arguments of ...
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1answer
244 views

How can I treat blocks in a split plot design?

In a field experiment involving crops, what is the difference in considering block as random or otherwise as fixed factor? As far as I understood, random means that conclusion can be extended to other ...
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1answer
994 views

Can I test the effect of Block in a split plot design in R?

I have been confused with the problem for a very long time, and hope that somebody here can help me out~ I have a experiment installed in split-plot design, with 3 temperal groups as blocks, and 2 ...
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1answer
888 views

Unbalanced repeated measure design for the given data?

I have 3 factors factor1 (treatment) with 2 levels (control, stress) factor2 (Variates) with 12 Levels (Var1, Var2,....Var12) factor3 (Time) with 12 levels (Week1, Week2,..., Week12) The treatment ...
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4answers
4k views

Omega squared for measure of effect in R?

The statistics book I am reading recommends omega squared to measure the effects of my experiments. I have already proven using a split plot design (mix of within-subjects and between-subjects design) ...