Repeated measures analysis with 2 predictors

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Fyodor Tatarinov 2023-6-30

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https://ww2.mathworks.cn/matlabcentral/answers/1990443-repeated-measures-analysis-with-2-predictors

评论： Fyodor Tatarinov 2023-7-4

I have data on measurements Y in 2 types of vegetation in ~20 days with 5 repetitions in each vegetation type. I need to do repeated measure analysis.

I organized the data in the table with columns:

Datenum, Vegetation, No of repetition, Y.

When I do:

rm = fitrm(data,'R ~ Datenum*Vegetation');

ranovatbl = ranova(rm);

I get an apparently wrong table:

SumSq DF MeanSq F pValue pValueGG pValueHF pValueLB

_____ __ ______ ___ ______ ________ ________ ________

(Intercept):Time 0 0 NaN NaN NaN NaN NaN NaN

Vegetation:Time 0 0 NaN NaN NaN NaN NaN NaN

Datenum:Time 0 0 NaN NaN NaN NaN NaN NaN

Vegetation:Datenum:Time 0 0 NaN NaN NaN NaN NaN NaN

Error(Time) 0 0 NaN NaN 0.5 0.5 0.5 0.5

What is the error? Should I add 'WithinDesign' parameter? Which one? When writing 'WithinDesign', data.Datenum it gives the error:

Specified design has 152 points; 1 required.

Thanks

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the cyclist 2023-6-30

It would be vastly easier to help you debug this if you upload the data. You can use the paper clip icon in the INSERT section of the toolbar.

Fyodor Tatarinov 2023-7-4

R for repeated measures.xlsx

Original data are in the Sheet1 of attachment. Finally I reorganized the data as in Sheet3 making dates as columns and excluding all rows and columns with missing values. In such configuration it worked

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