What level of measurement (nominal, ordinal, interval, ratio) is appropriate for the movie rating system that you see in tv guide?

the movie rating system uses an ordinal measurement system because ordinal measurement allows for rank order. In this case, we are ranking appropriateness for family viewing. We know the G rated movies are better than R rated movies, but we are unable to put a quantifiable value on how much better.

Also, we don't know if the difference between a G-rated and PG-rated is the same as the difference between PG-rated and PG13-rated.