On 01/02/2017 8:28 AM, CHIRIBOGA Xavier wrote:
Dear colleagues,
I am trying to perform a GLM. I tried again without using attach()...but still
is not working.
Do you have any idea to help me?
Thank you again,
Xavier
a <- read.table(file.choose(), h<-T)
The "h<-T" argument doesn't make sense. You are just lucky that it
worked here. For arguments you almost always use "=".
It's also a bad idea to use "T" as an abbreviation for "TRUE", but that
won't always cause problems.
head(a)
time treatment transinduc
1 1 CHA0+Db 1,0768
2 1 CHA0+Db 1,0706
3 1 CHA0+Db 1,0752
4 1 CHA0+Db 1,0689
5 1 CHA0+Db 1,1829
6 1 PCL+Db 1,1423
I assume that transinduc is supposed to be real numbers, with comma as
the decimal separator. You need to use dec = "," in read.table to read
that properly.
summary(a)
time treatment transinduc
Min. :1.000 CHA0 :10 1,0488 : 6
1st Qu.:1.000 CHA0+Db: 9 1,0724 : 4
Median :1.000 Db : 9 1,0752 : 3
Mean :1.433 HEALTHY:15 1,0954 : 3
3rd Qu.:2.000 PCL :10 1,0001 : 2
Max. :2.000 PCL+Db :14 1,0005 : 2
(Other):47
m1<-glm(a$transinduc~a$time*a$treatment,data=a,family="poisson")
Error in if (any(y < 0)) stop("negative values not allowed for the 'Poisson'
family") :
valor ausente donde TRUE/FALSE es necesario
Adem�s: Warning message:
In Ops.factor(y, 0) : '<' not meaningful for factors
It doesn't make sense to use fractional values like 1.0488 in Poisson
regression.
Duncan Murdoch
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