[R] code ok in unix & R2.6 , fails in windows & R 2.12

[Ramya]

Hi there,

I am using R version 2-12.1 and I am trying to use drm functions which is
version 0.5-8 both are the latest versions. 

but still it get the same Error  drm(Response ~ Expected, data = SC, fct =
LL.4()) : 
  Cluster not specified. Use e.g. y ~ x + cluster(id)

Any help would be of much help.

my data 

> SC <- read.delim("/Users/Ramya/d1.txt")
> SC
  Response Expected
1 10.06235    500.0
2 16.62795    250.0
3 28.79325    125.0
4 44.03961     62.5
5 60.19685     31.3
6 77.03876     15.6
7 80.17484      7.8
8 82.66292      3.9
> FourP <- drm(Response~Expected, data = SC, fct = LL.4())
Error in drm(Response ~ Expected, data = SC, fct = LL.4()) : 
  Cluster not specified. Use e.g. y ~ x + cluster(id)

Thanks
Ramya
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