```
# NOT RUN {
by_cyl <- mtcars %>% group_by(cyl)
# Sample fixed number per group
sample_n(mtcars, 10)
sample_n(mtcars, 50, replace = TRUE)
sample_n(mtcars, 10, weight = mpg)
sample_n(by_cyl, 3)
sample_n(by_cyl, 10, replace = TRUE)
sample_n(by_cyl, 3, weight = mpg / mean(mpg))
# Sample fixed fraction per group
# Default is to sample all data = randomly resample rows
sample_frac(mtcars)
sample_frac(mtcars, 0.1)
sample_frac(mtcars, 1.5, replace = TRUE)
sample_frac(mtcars, 0.1, weight = 1 / mpg)
sample_frac(by_cyl, 0.2)
sample_frac(by_cyl, 1, replace = TRUE)
# }
```

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