Generation creates a null distribution from specify() and (if needed)
hypothesize() inputs.
Learn more in vignette("infer").
generate(x, reps = 1, type = NULL, ...)
| x | A data frame that can be coerced into a tibble. |
|---|---|
| reps | The number of resamples to generate. |
| type | Currently either |
| ... | Currently ignored. |
A tibble containing reps generated datasets, indicated by the
replicate column.
The type argument determines the method used to create the null
distribution.
bootstrap: A bootstrap sample will be drawn for each replicate,
where a sample of size equal to the input sample size is drawn (with
replacement) from the input sample data.
permute: For each replicate, each input value will be randomly
reassigned (without replacement) to a new output value in the sample.
simulate: A value will be sampled from a theoretical distribution
with parameters specified in hypothesize() for each replicate. (This
option is currently only applicable for testing point estimates.)
# Generate a null distribution by taking 200 bootstrap samples gss %>% specify(response = hours) %>% hypothesize(null = "point", mu = 40) %>% generate(reps = 200, type = "bootstrap")#> Response: hours (numeric) #> Null Hypothesis: point #> # A tibble: 100,000 x 2 #> # Groups: replicate [200] #> replicate hours #> <int> <dbl> #> 1 1 38.6 #> 2 1 38.6 #> 3 1 13.6 #> 4 1 87.6 #> 5 1 8.62 #> 6 1 54.6 #> 7 1 30.6 #> 8 1 23.6 #> 9 1 38.6 #> 10 1 38.6 #> # … with 99,990 more rows# Generate a null distribution for the independence of # two variables by permuting their values 1000 times gss %>% specify(partyid ~ age) %>% hypothesize(null = "independence") %>% generate(reps = 200, type = "permute")#> Response: partyid (factor) #> Explanatory: age (numeric) #> Null Hypothesis: independence #> # A tibble: 100,000 x 3 #> # Groups: replicate [200] #> partyid age replicate #> <fct> <dbl> <int> #> 1 rep 36 1 #> 2 dem 34 1 #> 3 dem 24 1 #> 4 ind 42 1 #> 5 dem 31 1 #> 6 dem 32 1 #> 7 dem 48 1 #> 8 rep 36 1 #> 9 rep 30 1 #> 10 dem 33 1 #> # … with 99,990 more rows