[R] How to fix an error in nonlinear regression

[Vahid Borji]

Hello my R friends,
I am using the below commands in R:

attach(Puromycin)
Puromycin
plot(Puromycin$conc,Puromycin$rate)
mm=function(conc,vmax,k) vmax*conc/(k+conc)
mm
mm1=nls(rate~mm(conc,vmax,k),data=Puromycin,start=c(vmax=50,k=0.05),subset=state==”treated”)
mm1

Unfortunately,  I receive the below error:

Error: unexpected input in
"mm1=nls(rate~mm(conc,vmax,k),data=Puromycin,start=c(vmax=50,k=0.05),subset=state==”"

How can I fix this error?

	[[alternative HTML version deleted]]