Examples
is_frequency_weights(1)
#> [1] FALSE
is_frequency_weights(frequency_weights(1))
#> [1] TRUE
is_frequency_weights(importance_weights(1))
#> [1] FALSE
is_frequency_weights(1)
#> [1] FALSE
is_frequency_weights(frequency_weights(1))
#> [1] TRUE
is_frequency_weights(importance_weights(1))
#> [1] FALSE