plotting residuals in R error -


i'm trying plot fit in r , i following error:

error in xy.coords(x, y, xlabel, ylabel, log) : 'x' , 'y' lengths differ

here code:

exercise <- as.factor(c(10, 10, 20, 20, 10, 10, 20, 20)) time <- c("pm", "am", "am", "pm", "am", "pm", "pm", "am") glucose <- c(71.5, 103, 83.5, 126, 125.5, 129.5, 95, 93)  fit1 <- aov(glucose ~ exercise + time) summary(fit1)    par(mfrow = c(2, 2)) plot(fit1)

you need make sure time factor.

time <- as.factor(c("pm", "am", "am", "pm", "am", "pm", "pm", "am"))

then plot work. looks aov gets bit confused when pass character vector.


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