[R] Four parameter logistics.

[Ramya]

Hi,

I decided to use the drm function for four point fitting and in the all the
examples that i see 

spinach.m1 <- drm(SLOPE~DOSE, CURVE, data = spinach, fct = LL.4())

 fit1 <- drm(wheeze~p(age>9)+smoking+cluster(id),data=wheeze,dep="B",
print=0)

what are these with '~' mean?


This is my data

    conc  il10
1 50.000 1.918
2 25.000 1.251
3 12.500 1.104
4  6.250 0.719
5  3.125 0.403
6  1.563 0.177
7  0.781 0.083

I am trying to find the co-efficients for it. 

The co-eff that i am expecting is A = -0.457, B = 0.412, C = 915, D = 9.56


Any suggestions would be appreciated.



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