Displaying 6 results from an estimated 6 matches for "okusanya".
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oksana
2006 Aug 01
4
Overlay Boxplot with scatter plot
I am trying to make a box plot and overlay it with a scatter plot from
another data.frame. I was able to successfully create the boxplot, but
when i tried using points(x~y...) the dots did not show up.
example code
aa<-(300,300,300,300,600,600,600,600,900,900,900,900)
bb<-(13,12,14,11,56,44,34,75,22.,34,22,98,59,55,56)
cc<-(13,12,14,11,56,44,34,75,22.,34,22,98,59,55,56)
2007 Aug 10
7
Help wit matrices
Hello all,
I am working with a 1000x1000 matrix, and I would like to return a
1000x1000 matrix that tells me which value in the matrix is greater
than a theshold value (1 or 0 indicator).
i have tried
mat2<-as.matrix(as.numeric(mat1>0.25))
but that returns a 1:100000 matrix.
I have also tried for loops, but they are grossly inefficient.
THanks for all your help in advance.
Lanre
2006 Aug 09
3
Unique rows
hello all,
I have a dataset where the subjects are duplicated. How do I subset
such that I can get only I row/subject.
aa<-c(1,1,2,2,3,3,4,4,5,5,6,6)
bb<-c(56,56,33,33,53,53,20,20,63,63,9,9)
cc<-data.frame(aa,bb)
I would like to subset df(cc) such that I can get
aa bb
1 56
2 33
3 53
4 20
5 63
6 9
I know this should be fairly easy but I can't figure how to do it in a
dataframe and
2006 May 17
1
Example Syntax for if - then- and - else Statements
...t my syntax should look like. I am particularly
interested in syntax that can be used with the transform function. for
example
if foo[,1] == 'n', foo[,2] == 4, else foo[,2] == 6
Could someone please share simple example codes with different variants
on the theme.
thanks.
--
Lanre Okusanya, Pharm.D.,BCPS
UB/Pfizer Pharmacometrics Fellow
University at Buffalo School of Pharmacy and Pharmaceutical Sciences
237 Cooke Hall
Buffalo, NY 14260
Email: ooo at buffalo.edu
Tel: (716)645-2828 x 275
Fax: (716)645-2886
2005 Aug 25
4
covariance matrix under null
Hello
I am fitting a Cox PH model using the function coxph(). Does anyone know how
to obtain the estimate of the covariance matrix under the null hypothesis.
The function coxph.detail() does not seem to be useful for this purpose.
Thanks,
KD.
[[alternative HTML version deleted]]
2007 Aug 11
0
DOE and interaction plot general question
...unction and time interval
> (KOITA Lassana - STAC/ACE)
> 44. Re: need help to manipulate function and time interval
> (Henrique Dallazuanna)
> 45. Re: Cleaning up the memory (Prof Brian Ripley)
> 46. Re: write.table (Yinghai Deng)
> 47. Help wit matrices (Lanre Okusanya)
> 48. Re: Cleaning up the memory (Monica Pisica)
> 49. Re: Help wit matrices (jim holtman)
> 50. Row name of empty string issue (adiamond)
> 51. Re: Help wit matrices (Lanre Okusanya)
> 52. Re: Help wit matrices (Henrique Dallazuanna)
> 53. kde2d error message (Jennif...