CODEWITHSUNDEEP
r
Hakan Baba
Hakan Baba

Reputation: 2035

How to see the number of used observations to train a model?

Say I have a linear model in R. Using the model object, how can I see the number of observations used to train that model ?

For example 

library(ISLR)
lm.fit <- lm(mpg ~ acceleration + weight + horsepower + displacement, data = Auto)
lm.fit

How to see the number of observations used to train the model lm.fit?

In this example I obviously have access to the Auto data frame and could look at its rows with nrow(Auto). However, once you use the differing training and test sets, it becomes less obvious. I would like to make sure that the expected number of observations were used to train a model with just using the model object.

Upvotes: 1

Views: 1180

Answers (1)

jay.sf
jay.sf

Reputation: 73342

Just check the number of the fitted values.

length(lm.fit$fitted.values)
# [1] 392

Check:

dim(Auto)
# [1] 392   9

Upvotes: 1

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