why predict function is printing the out put too many times in R software?

Question

I have created a linear model with the R program. And I have predicted a new variable using the model. Running the model, it will print the output of prediction 600 times! (the number of variables we have in the data set). Here is the code:

load(sports)
summary (sports)
ls(sports)
fit = lm(sport_score ~ sport_votes + sport_rating , data = sports)
summary(fit)

newdata = data.frame( sport_vote = 80, sport_rating = 7.7)

predict(fit, newdata, interval="predict") 

How can I print the output just once?

Answer 1

It should be :

predict(fit, newdata=newdata, interval="predict") 

The first newdata is a parameter name. The second newdata is the symbol name of your 'values' to be used. If you don't give a value to the newdata parameter, it will just look for the default value, which as I said are the complete cases in sports .