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Comdex Ranking

 The Comdex is Not a Rating

The Comdex is not a rating itself, but a composite of all the ratings that a company has received. The Comdex ranks the companies, on a scale of 1 to 100, in relation to other companies that have been rated by the services. The Comdex is an effort to reduce the confusion over ratings, which is caused by each ratings service using a different scale.

 How is the Comdex Calculated?

To calculate the Comdex, we first determine the percentiles for each rating service. We start by counting the total number of companies rated by the service. Next we count the number of companies in each rating category. From that data, we calculate the percentile for each rating category. For Example, let us take a sample rating service and calculate the percentiles. The Super Rating Service assigns ratings in five categories, A, B, C, D and E. It has rated a total of 50 companies as shown below. The percentiles would be calculated as follows:

Ratings Companies Percentile
A 5 100
B 10 90
C 15 70
D 10 40
E 10 20

We repeat this process and construct a table of percentiles for each of the rating services. Using these tables, we can now calculate the Comdex for a given company. We take each rating that the company has received, and look up the percentile in the table for that rating service. Then we average the percentiles and factor in the number of ratings received to give the Comdex.

NOTE: A company needs to be rated by at least two rating services to receive a Comdex. The Comdex is based on the ratings issued by the following rating services: A.M. Best, Standard & Poor's, Moody's Investors Service and Fitch.




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