[R] Ack! Odd correlation matrix problem
Chris Bergstresser
chris at subtlety.com
Sat Apr 16 04:00:27 CEST 2005
Hi all --
Obviously, I'm missing something frightfully basic with the
following. What's likely going wrong?
> cr = cor(cluster.data, use = "complete.obs");
> cr["tax", "spend"]
[1] -0.6138096
> cor(cluster.data[["tax"]], cluster.data[["spend"]],
+ use = "complete.obs")
[1] -0.4925006
> df = data.frame(tax = cluster.data$tax,
+ spend = cluster.data$spend);
> cr = cor(df, use = "complete.obs");
> cr["tax", "spend"]
[1] -0.4925006
> cor(df[["tax"]], df[["spend"]], use = "complete.obs")
[1] -0.4925006
-- Chris
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