Displaying 4 results from an estimated 4 matches for "ancukiewicz".
2004 Apr 09
6
Incorrect handling of NA's in cor() (PR#6750)
Full_Name: Marek Ancukiewicz
Version: 1.8.1
OS: Linux
Submission from: (NULL) (132.183.12.87)
Function cor() incorrectly handles missing observation with method="spearman":
> x <- c(1,2,3,NA,5,6)
> y <- c(4,NA,2,5,1,3)
> cor(x,y,use="complete.obs",method="s")
[1] -0.1428571
>...
2005 Apr 04
2
Problems with predict.lm: incorrect SE estimate (PR#7772)
Full_Name: Marek Ancukiewicz
Version: 2.01
OS: Linux
Submission from: (NULL) (132.183.12.87)
It seems that the the standard error of prediction of the linear regression,
caclulated with predict.lm is incorrect. Consider the following example where
the standard error is first calculated with predict.lm, then using delta
metho...
2010 Feb 08
2
Incorrect Kendall's tau for ordered variables (PR#14207)
Full_Name: Marek Ancukiewicz
Version: 2.10.1
OS: Linux
Submission from: (NULL) (74.0.49.2)
Both cor() and cor.test() incorrectly handle ordered variables with
method="kendall", cor() incorrectly handles ordered variables for
method="spearman" (method="person" always works correctly, while
met...
1999 May 27
1
Factor structures not preserved after dump/dput (PR#200)
Full_Name: Marek Ancukiewicz
Version: 0.64.0
OS: Linux (RedHat 6.0)
Submission from: (NULL) (132.183.12.87)
I've noticed that factor structures get recoded when the data is dumped
using either dump or dput and then restored with source or dget. This
occurs when the values taken by factors do not include 1. For example:...