oppg9.4 | R Documentation |
Hvor mange av observasjonene i modell 2 har forhøyede Cook's D-verdier?
oppg9.4() oppg9.4
Silje Synnøve Lyder Hermansen
#Last inn data data(kap9) #Utvid modell mod2<-lm(Skepsis~KultSkepsis+ Inntekt+ Alder+Alder2+ Prekaritet*Innvandrer, data=kap9, na.action = "na.exclude") #Beregn Cooks distansemal CooksD<-cooks.distance(mod2) #Beregn grenseverdi N=length(na.omit(CooksD)) k=length(coefficients(mod2)-1) grense=4/(N-k-1) #Svar sum(CooksD>=grense, na.rm=TRUE)
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