R help - Sep 2009 - Why residual=T doesn't work in plot.gam?

Hi, all

In mgcv package, I tried to plot data.gam. However, residuals=TRUE doesn't
work for my data. No data points appear on the plot. What is the reason? The
number of the observation of my data set is almost 2000.

plot(data.gam,residuals=TRUE,shade=TRUE)

Thank you,

Lee

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