Hi everybody,
I try to do an exponential model with decreasing. In my data, there is no
data missing but there negative values. I adapted this following code whose
the origin code comes from in this forum:
Regress<-read.table("C:\\Users\\Regression.csv",sep=";",dec=",",header=TRUE)
Regress
f <- function(x,a,b) {a * exp(b * x)}
x<-Regress$EWT
y<-Regress$MSI7
plot(y ~ x)
fm <- nls(y ~ f(x,a,b), data =Regress, start = c(a=1, b=1))
co <- coef(fm)
curve(f(x, a=co[1], b=co[2]), add = TRUE)
But in the line 7, it blocks with the following message:
Erreur dans numericDeriv(form[[3L]], names(ind), env) :
Valeur manquante ou infinie obtenue au cours du calcul du mod?le
De plus : Messages d'avis :
1: In min(x) : aucun argument trouv? pour min ; Inf est renvoy?
2: In max(x) : aucun argument pour max ; -Inf est renvoy?
- Please where is the problem?
- What I can do to obtain R^2?
- Is the method to verify homoscedasticity and normality is the same for
linear model?
Thank you in advance
KOMINE
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