warning when calculating predicted values

Question

working with a data frame

x
    Date      Val
    1/1/2012   7
    2/1/2012   9
    3/1/2012   20
    4/1/2012   24
    5/1/2012   50
a <- seq(as.Date(tai         


        

Answer 1

Your data.frame a has a column named a. You created your model with columns named Val and Date so that is what its looking for.

when you make your data.frame a name that column Date and you're good to go:

a <- data.frame(Date=a)

Then it runs without the warning.

Per comment:

Edit your lm call to be:

lm(Val ~ Date, data=x)