File:Car Manufacturer Quality in 1990 by Infrequency of Trouble-Prone Models.png
Car_Manufacturer_Quality_in_1990_by_Infrequency_of_Trouble-Prone_Models.png (358 × 506 pixels, file size: 14 KB, MIME type: image/png)
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DescriptionCar Manufacturer Quality in 1990 by Infrequency of Trouble-Prone Models.png |
English: Car Manufacturer Quality in 1990 by Infrequency of Trouble-Prone Models
To form a car-manufacturer quality measure from Consumer Reports' 1990 list of 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 car manufacturers by the foregoing computations, together with their quality ratings, is given in the bar graph above. Only those manufacturers with at least 5 overall CR reliability ratings are included. For a Google Knol that summarizes the changes in car brand and manufacturer ranking by this quality measure from 1990 to 2010, visit http://knol.google.com/k/james-bleeker/automobile-quality-by-car-brand-and/3o3u27f0whd6k/2?hd=ns# . For a Google Knol that summarizes car manufacturer product quality from 1975 to 2010, visit "Car Quality from 1975 to 2010 - A History of U.S. Automobile Manufacturer Quality Ranks" at http://knol.google.com/k/james-bleeker/car-quality-from-1975-to-2010-a-history/3o3u27f0whd6k/9# . |
Date | |
Source | James Benjamin Bleeker, Web Master of http://www.AutoOnInfo.net and http://CarsOnInfo.net |
Author | James Benjamin Bleeker, Web Master of http://www.AutoOnInfo.net and http://CarsOnInfo.net |
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Date/Time | Dimensions | User | Comment |
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11 January 2011, 11:14:29 | 358 × 506 (17178 bytes) | JBleeker (talk · contribs) | {{Information |Description={{en|1=To form a car-manufacturer quality measure from the 1990 list of 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. Ne |
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current | 19:46, 29 August 2014 | 358 × 506 (14 KB) | GifTagger (talk | contribs) | Bot: Converting file to superior PNG file. (Source: Car_Manufacturer_Quality_in_1990_by_Infrequency_of_Trouble-Prone_Models.gif). This GIF was prob... |
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