Update the levels of rincome in gss_cat into three categories,
$10000 or more, less than $10000 and Others.
updated_gass_cat <- gss_cat %>%
mutate(rincome = fct_collapse(rincome,
"$10000 or more" = c("$10000 - 14999", "$15000 - 19999", "$20000 - 24999", "$25000 or more"),
"less than $10000" = c("$8000 to 9999", "$7000 to 7999", "$6000 to 6999", "$5000 to 5999", "$4000 to 4999", "$3000 to 3999", "$1000 to 2999", "Lt $1000"),
"Others" = c("Not applicable", "No answer", "Don't know", "Refused")
))
levels(updated_gass_cat$rincome)
## [1] "Others" "$10000 or more" "less than $10000"