fig8.3<-function(){
#Last inn data
data(kap8, envir = environment())
kap8 <- kap8
#Estimer modell
mod4<-lm(formula=Skepsis~Alder+Alder2,
data=kap8)
#Hypotetisk datasett
data.alder<-data.frame(Alder=15:105,
Alder2=c(15:105)*c(15:105))
#Prediksjoner
pred.ald=predict(mod4,
newdata = data.alder,
interval = "confidence")
#Grafikk for kurvilinear sammenheng i aldersgruppen 15 til 105 ar
plot(y = pred.ald[,"fit"],
x = 15:105,
type = "l",
bty = "n",
ylim = c(0,10),
xlab = "Alder",
ylab = "Skepsis",
main = "Effekten av alder pa innvandringsskepsis")
lines(y = pred.ald[,"lwr"],
x = 15:105,
lty=2)
lines(y = pred.ald[,"upr"],
x = 15:105,
lty=2)
}
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