Just my $0.02...
There have been a number of postings and questions on the list in the
last couple of weeks (that is, there seems to be a larger percentage
of such mail than usual...).
Maybe a "happy monthly reminder" could be sent out with the posting
guide? And maybe there could be something like "Write a sentence on
where you've searched for answers" so that responses such as the one
below may be avoided.
I don't post a lot, as I prefer replying offlist and don't really have
any specific questions, but it seems that there is an increasing
amount of posts where newbie hasn't read the posting guides or
someone's homework needs to be done (forgive me if I'm mistaken, but I
thought this list didn't do kids' homework?).
Anyhows, not meant to annoy, just a couple of thoughts.
Siri.
Siterer "Ralf B" <ralf.bie...@gmail.com>:
This is unbelievable. Now people like yourself start doing background
searches on one and accusing one of not being professional plus
posting cheeky R code. The reason why I submitted the questions I have
submitted was that these answers did not satisfy my particular problem
(or perhaps I mistakenly thought so). The point here is that the forum
should be a forum where one should be allowed to ask questions without
first studying the history of the the entire forum in fear that
someone might have asked it before. I was hoping that I could find
clearer answers then what I was able to read. I do know how to search
in Google. But I am not an expert in statistics, as you already found
in your background check. If I would be fluent in stastitsics and R
and if past answers would have exactly satisfied my problem I would
not post here and I certainly would not have occupied your expensive
attention.
On Wed, Aug 4, 2010 at 6:16 PM, David Winsemius
<dwinsem...@comcast.net> wrote:
On Aug 4, 2010, at 5:49 PM, Ralf B wrote:
Hi R Users,
I have two vectors, x and y, of equal length representing two types of
data from two studies. I would like to test if they are similar enough
to use them interchangeably. No assumptions about distributions can be
made (initial tests clearly show that they are not normal).
Here some result:
Two-sample Kolmogorov-Smirnov test
data: x and y
D = 0.1091, p-value < 2.2e-16
alternative hypothesis: two-sided
Warning message:
In ks.test(x[1:nx], y[1:nx], exact = FALSE) :
cannot compute correct p-values with ties
Here some questions:
a) What does the error message means and what does it imply?
b) The data is very noisy and the initial result shows that there is
no relation between x and y. Is there a way to calculate and effect
size?
c) Can the p-value be used, when running tests over a large amount of
different data sets, as a metric for ranking similarity between x and
y data sets?
There has been quite a bit of discussion on this list over the years about
why KS test is not good in this situation. If I read the results of a search
on your name correctly, you are in a department of Information Sciences. I
would have thought that the first reaction of someone in that field would be
do do a search on a question. Why are you filling up the archives with
questions that have been repeatedly asked and answered?
Do you need help in this area?
rhelpSearch <- function(string,
restrict = c("Rhelp10", "Rhelp08", "Rhelp02", "functions"
),
matchesPerPage = 100, ...)
RSiteSearch(string=string, restrict = restrict, matchesPerPage =
matchesPerPage, ...)
rhelpSearch("KS.test ties p-value")
Best
R.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
