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Update fct_lump() usage 

Fixes #855
This commit is contained in:
Hadley Wickham 2021-04-18 09:21:59 -05:00
parent 4c171731e9
commit 42bbae55d3
1 changed files with 10 additions and 10 deletions
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20
factors.Rmd
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@ -336,22 +336,21 @@ gss_cat %>%
```
Sometimes you just want to lump together all the small groups to make a plot or table simpler.
That's the job of `fct_lump()`:
That's the job of the `fct_lump_*()` family of functions.
`fct_lump_lowfreq()` is a simple starting point that progressively lumps the smallest groups categories into "Other", always keeping "Other" as the smallest category.
```{r}
gss_cat %>%
mutate(relig = fct_lump(relig)) %>%
mutate(relig = fct_lump_lowfreq(relig)) %>%
count(relig)
```
The default behaviour is to progressively lump together the smallest groups, ensuring that the aggregate is still the smallest group.
In this case it's not very helpful: it is true that the majority of Americans in this survey are Protestant, but we've probably over collapsed.
Instead, we can use the `n` parameter to specify how many groups (excluding other) we want to keep:
In this case it's not very helpful: it is true that the majority of Americans in this survey are Protestant, but we'd probably like to see some more details!
Instead, we can use the `fct_lump_n()` to specify that we want exactly 10 groups:
```{r}
gss_cat %>%
mutate(relig = fct_lump(relig, n = 10)) %>%
mutate(relig = fct_lump_n(relig, n = 10)) %>%
count(relig, sort = TRUE) %>%
print(n = Inf)
```
@ -360,7 +359,8 @@ gss_cat %>%
1. How have the proportions of people identifying as Democrat, Republican, and Independent changed over time?
1. How could you collapse `rincome` into a small set of categories?
1. Notice there are 9 groups (excluding other) in the `fct_lump` example above. Why not 10? (Hint: type `?fct_lump`, and find the default for the argument `other_level` is "Other".)
2. How could you collapse `rincome` into a small set of categories?
3. Notice there are 9 groups (excluding other) in the `fct_lump` example above.
Why not 10?
(Hint: type `?fct_lump`, and find the default for the argument `other_level` is "Other".)