speed_vector should be converted to an ordinal factor since its categories have a natural ordering. By default, the function factor() transforms speed_vector into an unordered factor. To create an ordered factor, you have to add two additional arguments: ordered and levels.
factor(some_vector,
ordered = TRUE,
levels = c("lev1", "lev2" ...))
By setting the argument ordered to TRUE in the function factor(), you indicate that the factor is ordered. With the argument levels you give the values of the factor in the correct order.
From speed_vector, create an ordered factor vector: factor_speed_vector. Set ordered to TRUE, and set levels to c("slow", "medium", "fast").
# Create speed_vector
speed_vector <- c("medium", "slow", "slow", "medium", "fast")
# Convert speed_vector to ordered factor vector
factor_speed_vector <-
# Print factor_speed_vector
factor_speed_vector
summary(factor_speed_vector)
# Create speed_vector
speed_vector <- c("medium", "slow", "slow", "medium", "fast")
# Add your code below
factor_speed_vector <- factor(speed_vector, ordered = TRUE, levels = c("slow", "medium", "fast"))
# Print factor_speed_vector
factor_speed_vector
summary(factor_speed_vector)
msg = "Do not change anything about the command that specifies the `speed_vector` variable."
test_object("speed_vector", undefined_msg = msg, incorrect_msg = msg)
test_function("factor", args = c("x", "ordered", "levels"),
incorrect_msg = c("The first argument you pass to `factor()` should be `speed_vector`.",
"Make sure to set `ordered = TRUE` inside your call of `factor()`.",
"Make sure to set `levels = c(\"slow\", \"medium\", \"fast\")` inside your call of `factor()`."))
test_object("factor_speed_vector", eq_condition = "equal",
incorrect_msg = "There's still something wrong with `factor_speed_vector`; make sure to only pass `speed_vector`, `ordered = TRUE` and `levels = c(\"slow\", \"medium\", \"fast\")` inside your call of `factor()`.")
success_msg("Great! Have a look at the console. It is now indicated that the Levels indeed have an order associated, with the `<` sign. Continue to the next exercise.")
Use the function factor() to create factor_speed_vector based on speed_character_vector. The argument ordered should be set to TRUE since there is a natural ordering. Also, set levels = c("slow", "medium", "fast").