Displaying 3 results from an estimated 3 matches for "startparam".
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2009 Jul 26
1
Non-Linear Regression with two Predictors
Hello there,
I am using nls the first time for a non-linear regression with a
logistic growth function:
startparam <- c(alpha=3e+07,beta=4000,gamma=2)
fit <- nls(dataset$V2~(( alpha / ( 1 + exp( beta - gamma * dataset$V1 )
) ) ),data=dataset,start=startparam)
Everything works fine and i get good results. Now I would like to
improve the results using my DUMMY Variable (dataset$V6) the runs half
of the...
2012 Dec 07
1
Error using constrOptim in constraint definition
Hello,
I'm trying to run constrOptim. It returns to me an error about the fact that constraints arguments (ui and ci) are non compatibles:
> optout= constrOptim(startparams, f=ImpulseSS, grad=grImpulse, ui=UI, ci=CI, data=gexp[k,], t=t)
Error in ui %*% theta : non-conformable arguments
I would like to point out that I can calculate that product in the command line:
> UI %*% startparams
[,1]
[1,] 2.297217e+05
[2,] 1.699765e+05
[3,] 2.037806e...
2012 Nov 20
0
double gaussian with mixdist: what's wrong?
...253,331,419,563,781,1134,1423,1842,2505,374,6099,9343,13009,
? ? ? ? ? ? ? ? ? ?15097,13712,9969,6785,4742,3626,3794,4737,5494,5656,4806,3474,2165,1290,799,431,213,137,66,57,41,35,27,27,27)
? data.df <- data.frame(time=time, counts=counts)
? data.mix <- as.mixdata(data.df)
? plot(data.mix)
? startparam <- mixparam(c(699,707),1
? data.fit <-?mix(data.mix, startparam, "norm")
--- end code ---
This results in:
? Error in nlm(mixlike, lmixdat = mixdat, lmixpar = fitpar, ldist = dist, ?:?
? ? missing value in parameter
I have used this fit method successfully with other data sets. W...