Error in model.frame.default()

General
1

I am trying to predict in lm model, but when a use predict it does not work

THIS IS MY CODE
modelo1=lm(Y~X11 + X3 + X6 + X5 + X2, data=Datos1)
summary(modelo1)

newdata1=data.frame(X2=150, X3="Rutas de la universidad", X5=200, X6="Sin ingresos", X11=0)
predict(modelo1,
newdata=newdata1,
interval="confidence",
level=0.95)

Error in model.frame.default(Terms, newdata, na.action = na.action, xlev = object$xlevels) :
factor X6 has new level Sin ingresos

2

Does your original data, Datos1, have any values of "Sin ingresos" in the X6 column? The error suggests that it does not.

3

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