search for: propdead

Displaying 1 result from an estimated 1 matches for "propdead".

2008 Feb 12
1
Finding LD50 from an interaction Generalised Linear model
...1 4 F 11 12 5 F 14 > str(dat) 'data.frame': 12 obs. of 3 variables: $ ldose : int 0 1 2 3 4 5 0 1 2 3 ... $ sex : Factor w/ 2 levels "F","M": 2 2 2 2 2 2 1 1 1 1 ... $ numdead: int 0 3 9 16 18 20 0 2 6 10 ... > ##convert numdead to propdead > dat$propdead<-dat$numdead/20 > ##Calculate survival from dead > dat$numsurv<-20-dat$numdead > dat$propsurv<-dat$numsurv/20 > ##check table > dat ldose sex numdead propdead numsurv propsurv 1 0 M 0 0.00 20 1.00 2 1 M 3 0.15...