Investment ratings (e.g., by Morningstar) provide a simple ordinal scale (e.g., 1 to 5) for comparing investments. Typically, ratings are assigned within categories — groups of assets sharing common characteristics — but using the same ordinal scale for all groups. Comparing such categorized...

Financial product ratings are intended to summarize relevant information in a manner that assists in decision-making. Ratings, however, have the potential to be either helpful or harmful. Ratings are often assigned within categories; ratings across categories then may or may not be comparable....

Investment ratings (e.g., by Morningstar) provide a simple ordinal scale (e.g., 1 to 5) for comparing investments. Typically, ratings are assigned within categories -- groups of assets sharing common characteristics -- but using the same ordinal scale for all groups. Comparing such categorized...