[R] Plotting Standard Regression Fit-Am I wrong or a bug?

[uep]

However, now a linear regression with a factor for quarterly effect doesn't
want to work for me:
t2<-lm(mats~time+quar)
and I get an error message:
"Error in model.frame.default(formula = mats ~ time + quar,
drop.unused.levels = TRUE) : 
  variable lengths differ (found for 'quar')"

Which variable has wrong length?

Looking forward to a response
Ula



Unfortunately for me, this example works and does plot fitted line and
predicted points. I really don't understand why I can't make the same
commands work when trying with my real life data.



Ula





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