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Auto Quality Ratings and Auto Quality Rankings

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1990 Automobile Manufacturer Quality Ratings and Rankings
by James Bleeker

Content Summary

This page provides two rankings of the manufacturers of automobiles with more significant sales in North America from model year 1984 to 1989. Each ranking employs a different method of computation.

The statistics used in the computations for rating and ranking the car makers are those found within the April 1990 issue of Consumer Reports. The two sections providing the necessary statistics are CR's Used-Cars-To-Avoid list and its reliability charts. Reliability is defined by the magazine as the infrequency of serious problems, which it measures annually by a subscriber survey.

The first ranking of the car makers is based on each manufacturer's infrequency of trouble-prone models. This ranking provides a measure of how well each manufacturer's models successfully avoided the bottom end of the model-quality spectrum.

The second ranking of the car makers is based on the average of the overall reliability ratings of each manufacturer's models. The second ranking provides a measure of how well a manufacturer's models performed over the entire model-quality spectrum.

1990 Auto Manufacturer Quality by Infrequency of Trouble-Prone Models

To form a car-manufacturer quality measure from the 1990 list of Some Used Cars To Avoid, the first step is to count each manufacturer's entries on the list. Each model year of each model is treated as a separate entry.

Next, as the number of automobile models sold by a car manufacturer varies greatly from maker to maker, it is necessary to take account of the fact that a manufacturer with more models has a greater opportunity to have more model years of low quality. To compensate for a possibly inflated, or deflated, frequency of trouble-prone model years of a manufacturer, as well as a variability in model data sufficiency, the number of a manufacturer's entries in CR's 1990 Used-Cars-To-Avoid list is divided by the total number of overall reliability ratings for the manufacturer found in the reliability charts of the same issue of Consumer Reports. The overall reliability ratings are found in the Trouble-Index row of the 1990 reliability charts.

By the method of computation, this quality measure begins with 0 and may run to a value some greater than 1. The value of 0 is the highest quality rating attainable by a car manufacturer and is achieved only when a manufacturer has no entry on the Used-Cars-To-Avoid list.

The quality ranking of the automobile manufacturers by the foregoing computations, together with their quality ratings, are given in the first bar graph below. Only those manufacturers with at least 5 overall CR reliability ratings are included.

1990 Auto Manufacturer Quality by the Average of Overall Reliability Ratings

To compute car-maker quality ratings and assemble a manufacturer-quality ranking using Consumer Reports' overall reliability ratings, a number is associated with each rating. A +1.0 is ascribed to a rating of Much Better Than Average, a +0.5 to a rating of Better Than Average, a 0 to a rating of Average, a -0.5 to a rating of Worse Than Average, and a -1.0 to a rating of Much Worse Than Average. Then an average is taken over all of the manufacturer's model years and models offering an overall reliability rating. CR's 1990 overall reliability ratings are found in the Trouble-Index row of its reliability charts.

For this measure of quality, the range is from -1.0 (the worst possible) to +1.0 (the best possible).

The quality ranking of the car manufacturers by this set of computations, together with their quality ratings, are given in the second bar graph below. Only those manufacturers with at least 5 overall CR reliability ratings are included.

The Bar Graphs of Auto Manufacturer Quality in 1990

In both of the graphs that follow, the order of the car manufacturers is from best to worst.

Automobile Manufacturer Quality in 1990 by Infrequency of Trouble-Prone Models Automobile Manufacturer Quality in 1990 by Average of CR's Overall Reliability Ratings

Summary and Analysis

In 1990, the Top 3 auto manufacturers by infrequency of trouble-prone models were, in descending order (best first), Honda Motor Company, BMW AG, and Toyota Motor Corporation. Of the three, only Honda had a perfect score by this quality measure. Also, Honda showed a very solid improvement from 5 years earlier when it placed 8th with a score of 0.16.

The Bottom 3 auto manufacturers by frequency of trouble-prone models were, in ascending order (worst first), Jaguar, Saab, and Hyundai Motor Company. General Motors Corporation was fourth from the bottom.

In 1990, the Top 3 auto manufacturers by overall reliability were, in descending order, Honda Motor Company, Toyota Motor Corporation, and Mazda Motor Corporation. Here, too, Honda showed a very solid gain from 5 years earlier, when its score by this measure was a modest 0.79. Toyota took a tumble, from 1.00 to 0.82, but still placed second.

The Bottom 3 auto manufacturers by overall reliability, in ascending order (worst first), were Jaguar, General Motors Corporation, and Hyundai Motor Company.

Two car manufacturers are common to the Top 3 of both quality rankings:

Honda
Toyota

Two car manufacturers are common to the Bottom 3 of both quality rankings:

Jaguar
Hyundai

One interesting point from the above graphs is that the Big Three - General Motors, Chrysler, and Ford - constituted half of the Bottom 6 by both quality measures.

Additional Resources

To view the graphs showing the 1990 ratings and rankings of the brands of automobiles, click Go.

For a Google Knol that summarizes the changes in auto-brand and auto-manufacturer ranking by these quality measures from 1990 to 2010, click Go.

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