Likert-type Ratings

Now, we will add another twist to the discussion. Many psychologists create measures by adding up the individual Likert-type ratings or calculating an average rating across items. As some psychologists consider Likert ratings to be ordinal and others classify them as approximately interval, what is the scale of measurement of scores created from a set of individual Likert-type ratings? Most psychologists consider such scores to be roughly or approximately equal interval. The term "approximately interval" denotes that the scales are not interval but are treated as such in data analysis.