Re: [R] missing value with sign observed

From: Ben Bolker <bolker_at_ufl.edu>
Date: Sat, 05 Apr 2008 21:33:26 +0000 (UTC)

kate <yhsu6 <at> uiuc.edu> writes:

[snip]

>
> When I read this txt file into R and attach this data, I found the output of y
is as the follows
> [1] 8 5 3 + -1 +
> Levels: -1 + 3 5 8
>
> Could I get rid of Levels in the output? Because I need to use the observed y
and x run regression first and then
> assign the value to the missing y later.
>

  You probably want to use the argument na.strings="+" in your input command (scan or read.table) -- R is interpreting the existence of a non-numeric value in your input as evidence that you want that variable to be a factor (a categorical, non-numeric variable).

  Ben Bolker



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