Hard coded variable name x should be avoided

Please specify whether your issue is about:

[x ] a possible bug
[ ] a question about package functionality
[ ] a suggested code or documentation change, improvement to the code, or feature request

The summary method has a hard coded variable name x. This is problematic: x is quite commonly used as the name for a predictor variable when teaching regression. If we have x as a predictor, the summary method incorrectly selects the predictors as the predicted value and vice versa.

Put your code here:

## load package
library("prediction")

## code goes here

set.seed(12345)
N <- 200

x <- rnorm(N)
y <- x+rnorm(N)

m1 <- lm(y ~ x)

p1 <- prediction(m1, at=list(x=-3:3))
summary(p1)

## session info for your system
sessionInfo()

leeper / prediction

Hard coded variable name x should be avoided #46