Achim Zeileis wrote:
On Fri, 17 Jul 2009, Daniel Abbott wrote:
Hello,
I apologize if an answer to my questions is available, or if I
submitted this question incorrectly. I have read the mailing lists, as
well as the R Project and CRAN homepages. However, I may have missed
something.
I noticed the package 'norm' has been removed. Its page
http://cran.r-project.org/web/packages/norm/index.html now reads:
"Package ?norm? was removed from the CRAN repository.
Formerly available versions can be obtained from the archive."
My questions are:
1. Why was norm removed? I used the package and found it to be very
useful. Is there a serious error in the package or another problem?
What do you consider to be a serious error?
Typical reasons for removing a package from the active CRAN repository
are that the package does not pass CRAN checks and/or that the package
maintainer is irresponsive. (norm, specifically, hadn't been updated
since 2002.) This is serious enough to make all automatic CRAN features
such as daily package checks and building of binary packages too
cumbersome.
But if you do not consider this to be serious, you can keep on using
"norm", it is still in CRAN's package archives. Or, even better, you
could adopt it, fix it, and release a new version to CRAN (although it
is not quite clear to me whether the norm's license allows this).
Oh yes, indeed.
Please ignore my former message, I haven't looked at the license
carefully enough. And since the license is rather special (not GPL'ed as
I assumed in my message), you cannot take over maintainership without
negotiation with the former maintainer, I fear.
Best,
Uwe Ligges
(Note that CRAN runs no checks whether the methods implemented are
reasonable or well-suited for the problem they are trying to address etc.)
2. If norm should no longer be removed, what is another good package
for ML (maximum likelihood) missing data imputation? I have seen
several recommendations online, but I wonder which one is currently
the "reigning champ."
The "Multivariate" and the "SocialSciences" task views have sections
about missing data
http://CRAN.R-project.org/view=Multivariate
http://CRAN.R-project.org/view=SocialSciences
Additionally, I can recall that there is the Amelia II package:
http://CRAN.R-project.org/package=Amelia
and potentially others.
hth,
Z
Thank you very much. I appreciate your time!
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and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
