Demonstration of Why Exporting R Objects is Not Safe

First thing we will do is show the first few entries in the mtcars dataset

head(mtcars[c("mpg","cyl","disp")])

##                    mpg cyl disp
## Mazda RX4         21.0   6  160
## Mazda RX4 Wag     21.0   6  160
## Datsun 710        22.8   4  108
## Hornet 4 Drive    21.4   6  258
## Hornet Sportabout 18.7   8  360
## Valiant           18.1   6  225

Now we fit a regression model

m1 <- lm(mpg ~ cyl + disp, data=mtcars)

Think it is safe to email this to people without DUAs? Think again

head(m1$model)

##                    mpg cyl disp
## Mazda RX4         21.0   6  160
## Mazda RX4 Wag     21.0   6  160
## Datsun 710        22.8   4  108
## Hornet 4 Drive    21.4   6  258
## Hornet Sportabout 18.7   8  360
## Valiant           18.1   6  225

Now we can call lm with model=FALSE option.

m2 <- lm(mpg ~ cyl + disp, data=mtcars, model=FALSE)

Try printing data now

head(m2$model)

## NULL