Displaying 7 results from an estimated 7 matches for "regardspetr".
2002 Jul 23
3
Aggregate: assembling the "by" part on the fly
Dear R users,
I'm having trouble using aggregate() and would
greatly appreciate your advice. I am using R 1.5.1
on Windows 2000.
I want to call my function in the following way
extract.data(x=dat[, "Age", "Year"])
where extract.data() uses aggregate() to count the number
of cases for each combination of "Age" and "Year".
I've defined
2003 Feb 20
1
inserting an extra row into an array
Does anyone know a simple way to insert an extra row into a matrix or data
frame, thus increasing the dimensions.
Wayne
KSS Ltd
A division of Knowledge Support Systems Group plc
Seventh Floor St James''s Buildings 79 Oxford Street Manchester M1 6SS England
Company Registration Number 2800886 (Limited) 3449594 (plc)
Tel: +44 (0) 161 228 0040 Fax: +44 (0) 161 236 6305
2002 Jul 26
4
chi square test is not appropriate? but what test is
...for testing counts or frequencies (if I understand it well).
If I wanted to know whether these differences are significant,
what type of statistical test I should use, when I have no access to
underlaying data?
Is it possible to do any statistical test on such data?
Thank you in advance
Best regardsPetr Pikal
petr.pikal at precheza.cz
p.pik at volny.cz
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2003 Feb 21
2
how to chage values in data frame to NA iside a function
Dear all
I have a function in which I would like to change some values to NA according to
some condition.
dropout<-function(y, nahr=FALSE,...) {
<some stuff for computing an index>
if (nahr) y[index]<<-NA
invisible(index)
}
in case y is a vector all works OK but if it is a part of data frame by calling
dropout(df$y) or dropout(df[,number]) no change is done.
Please can you
2002 Jul 19
1
Re RGui and object browser
...;-
data.frame(Object.Name,Object.Mode,Object.Type,Observations,Variables)
if(mode != "any") objList <- objList[objList[["Object.Mode"]] == mode,]
if(type != "any") objList <- objList[objList[["Object.Type"]] == type,]
return(objList)
}
Best regardsPetr Pikal
petr.pikal at precheza.cz
p.pik at volny.cz
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body&qu...
2002 Jul 18
2
RODBC and Excel Files
Hello,
I am trying to play with RODBC library and Excel Files. In my file
(doubs.xls) there are 2 spreadsheets:
> library(RODBC)
> connection<-odbcConnect("Excel Files")
> sqlTables(connection)
TABLE_CAT TABLE_SCHEM TABLE_NAME TABLE_TYPE REMARKS
1 F:\\Th?se\\R\\Doubs NA Faune$ SYSTEM TABLE NA
2 F:\\Th?se\\R\\Doubs NA Milieu$
2002 Sep 30
5
Chi-Square Distribution Plots
Dear list
I have a vector of values that allegedly have a chi-squared distribution. I
want to create a plot that shows the values I have obtained, and the
chi-squared distribution curve for the specified number of degrees of freedom
to show what should have been obtained.
At the moment I am plotting the values I have obtained as a histogram and
somehow want to put on to this plot the