factors.Rd
Provides pipefriendly functions to convert simultaneously multiple variables into a factor variable.
Helper functions are also available to set the reference level and the levels order.
convert_as_factor(data, ..., vars = NULL, make.valid.levels = FALSE) set_ref_level(data, name, ref) reorder_levels(data, name, order)
data  a data frame 

...  one unquoted expressions (or variable name) specifying the name of
the variables you want to convert into factor. Alternative to the argument

vars  a character vector specifying the variables to convert into factor. 
make.valid.levels  logical. Default is FALSE. If TRUE, converts the variable to factor and add a leading character (x) if starting with a digit. 
name  a factor variable name. Can be unquoted. For example, use

ref  the reference level. 
order  a character vector specifying the order of the factor levels 
convert_as_factor
: Convert one or multiple variables into factor.
set_ref_level
: Change a factor reference level or group.
reorder_levels
: Change the order of a factor levels
# Create a demo data df < tibble( group = c("a", "a", "b", "b", "c", "c"), time = c("t1", "t2", "t1", "t2", "t1", "t2"), value = c(5, 6, 1, 3, 4, 5) ) df#> # A tibble: 6 x 3 #> group time value #> <chr> <chr> <dbl> #> 1 a t1 5 #> 2 a t2 6 #> 3 b t1 1 #> 4 b t2 3 #> 5 c t1 4 #> 6 c t2 5# Convert group and time into factor variable result < df %>% convert_as_factor(group, time) result#> # A tibble: 6 x 3 #> group time value #> <fct> <fct> <dbl> #> 1 a t1 5 #> 2 a t2 6 #> 3 b t1 1 #> 4 b t2 3 #> 5 c t1 4 #> 6 c t2 5#> [1] "a" "b" "c"# Set c as the reference level (the first one) result < result %>% set_ref_level("group", ref = "c") levels(result$group)#> [1] "c" "a" "b"# Set the order of levels result < result %>% reorder_levels("group", order = c("b", "c", "a")) levels(result$group)#> [1] "b" "c" "a"