Displaying 3 results from an estimated 3 matches for "tstdata".
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testdata
2009 Nov 16
3
Sum over indexed value
I am sure this is easy but I am not finding a function to do this.
I have two columns in a matrix. The first column contains multiple entries
of numbers from 1 to 100 (i.e. 10 ones, 8 twos etc.). The second column
contains unique numbers. I want to sum the numbers in column two based on
the indexed values in column one (e.g. sum of all values in column two
associated with the value 1 in column
2005 Oct 06
0
how to handle missing values in the data?
...Linear Model (glm) function. I
might have commited some error, but i am not sure where i did?
The script for glm function i have tried is as:
trdata<-data.frame(train,row.names=NULL)
attach(trdata)
glmmod <- glm(Class~., family= binomial(link =
"logit"),data=trdata,maxit=50)
tstdata<-data.frame(test,row.names=NULL)
attach(tstdata)
xtst <- subset(tstdata, select = -Class)
ytst <- Class
pred<-predict(glmmod,xtst)
library(mda)
confusion(pred,ytst)
can you help me to sort out the problems?
Uttam Phulwale
Tata Consultancy Services Limited
Mailto: uttam.phulwale@tcs....
2009 Nov 16
8
extracting the last row of each group in a data frame
Hi,
I would like to extract the last row of each group in a data frame.
The data frame is as follows
Name Value
A 1
A 2
A 3
B 4
B 8
C 2
D 3
I would like to get a data frame as
Name Value
A 3
B 8
C 2
D 3
Thank you for your suggestions in advance
Jeff