[R] missing value with sign observed

From: kate <yhsu6_at_uiuc.edu>
Date: Sat, 05 Apr 2008 16:06:03 -0500


I have (x, y) data as the follows (saved in the txt file):

x y
1 8
2 5
3 3
4 +
5 -1
6 +

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.



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