Aligning Data frame with missing values

Question

I\'m using a data frame with many NA values. While I\'m able to create a linear model, I am subsequently unable to line the fitted values of the model up with

Answer 1

If you do not want to change the raw data. Try this way, it's really simple.

names(fitted.values(model)) are data's rownames of available observations, and we can use this feature to add new column:

dat[names(fitted.values(model)), "fitted.values"] <- fitted.values(model)
sum(!is.na(dat[, "fitted.values"]))
# [1] 2745