Preserving the most common levels

Sometimes you don't want to keep levels by proportion but instead the most common n levels. Let's see how the resulting levels kept for MLMethodNextYearSelect changes when we kept by number instead of proportion. multiple_choice_responses has been loaded for you.

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Categorical Data in the Tidyverse

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Instrucciones del ejercicio

Remove people who didn't select a method.
Create a new variable, ml_method, from MLMethodNextYearSelect that preserves 5 most common titles and lumps the rest as "other method" using the argument other_level.
Count the frequency of each ml_method, sorting in descending order.

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multiple_choice_responses %>%
  # Remove NAs 
  filter(___) %>%
  # Create ml_method, retaining the 5 most common methods and renaming others "other method" 
  mutate(ml_method = ___(MLMethodNextYearSelect, ___, other_level = ___)) %>%
  # Count the frequency of your new variable, sorted in descending order
  ___(ml_method, ___)

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