Nothing

```
context("Utilities")
require(survey)
test_that("weighted_ntiles on integers", {
expect_equal(weighted_ntile(1:5, weights = rep(1, 5), n = 2), c(1, 1, 1, 2, 2))
expect_equal(weighted_ntile(1:5, weights = rep(1, 5), n = 5), c(1, 2, 3, 4, 5))
expect_equal(weighted_ntile(vector = 5:1, weights = rep(1, 5), n = 5), rev(c(1, 2, 3, 4, 5)))
expect_equal(weighted_ntile(n = 2, vector = 1:4, c(1, 1, 1, 5)), c(1, 1, 1, 1))
expect_equal(weighted_ntile(n = 4, vector = 4:1, weights = c(1, 1, 1, 5)), c(4, 4, 3, 1))
expect_warning(weighted_ntile(1:5, weights = c(1, 1, 1, 2, 0), n = 5))
})
test_that("weighted_ntile agrees with svyquantile", {
set.seed(13)
N <- 1e4
wts <- pmax(round(abs(rnorm(N)), 2), 0.01) # pmax(,0.01) to ensure no nonzero weights
val <- round(abs(rnorm(N)), 2) %>% sort
n <- 10
quantiles <- c(0:n) / n
dummy_survey <-
data.table(ids = 1:N,
wts = wts,
val = val)
survey_package_quantiles <-
svydesign(data = dummy_survey, ids = ~ids, weights = ~wts) %>%
svyquantile(design = ., x = ~val, quantiles = quantiles)
survey_cut_twice <-
dummy_survey %>%
mutate(survey__package_ntiles = .bincode(val,
breaks = survey_package_quantiles,
include.lowest = TRUE),
grattan_package_ntiles = weighted_ntile(vector = val, weights = wts, n = n))
survey_package_cut <-
survey_cut_twice %>%
group_by(survey__package_ntiles) %>%
summarise(ww = sum(wts))
grattan_package_cut <-
survey_cut_twice %>%
group_by(grattan_package_ntiles) %>%
summarise(ww = sum(wts))
# In a dataset cut by proper quantiles, the
# sum of weights within each quantile should be
# equal. For real-world data sets, ties etc mean
# that they are not exactly equal. We require
# that our function performs at least as well as
# package:survey's quantiles.
expect_lte(sd(grattan_package_cut$ww), sd(survey_package_cut$ww))
})
```

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