Hello!
I am trying to figure out how to extract the model equation when using deriv3
with nls.
Here is my example:
#
# Generate derivatives
#
Puro.fun2 <- deriv3(expr = ~(Vmax + VmaxT*state) * conc/(K + Kt * state + conc),
name = c("Vmax","VmaxT","K","Kt"),
function.arg = function(conc, state, Vmax, VmaxT, K, Kt)
NULL)
#
# Fit model using derivative function
#
Puro.fit1 <- nls(rate ~ Puro.fun2(conc, state == "treated", Vmax, VmaxT, K, Kt),
data = Puromycin,
start = c(Vmax = 160, VmaxT = 47, K = 0.043, Kt = 0.05))
Normally I would use summary(Puro.fit1)$formula to extract the model but
because I am implementing deriv3, the following gets returned:
> summary(Puro.fit1)$formula
rate ~ Puro.fun2(conc, state == "treated", Vmax, VmaxT, K, Kt)
What I would like to do is find something that returns:
rate ~ (Vmax + VmaxT*state) * conc/(K + Kt * state + conc)
Is there a way to extract this? Please advise. Thanks for your time.
Steve
860-441-3435
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