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Here is my code:

res.aov <- anova_test( data = tomato1, dv = Pb, wid = Plant.Id, within = Year, between = c(Treatment, Site)) get_anova_table(res.aov)

When I run the code, I get the following error:

Error in solve.default(crossprod(model.matrix(mod))) : system is computationally singular: reciprocal condition number = 7.14179e-18

The variables plant.id treatment and site are all factors. I have tried the variable type year as numeric and as a factor. The variable Pb is numeric.

There are a total of 38 observations in this dataset.

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  • Usually this is caused when 2 or more variables which are highly correlated with one another. I would reccomend looking at the correlation of all pairs of your variables to see if any are highly correlated. Commented Jul 20, 2021 at 15:32
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    Does this answer your question? System is computationally singular: reciprocal condition number in R Commented Jul 20, 2021 at 15:33
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