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DefinitionsIn each table contained herein, the term mean indicates that the incomes of all individuals in a group were added together and the total divided by the number of cases involved. This measure of central tendency can be unduly influenced by a few very high or very low data. While the mean is more convenient for the purpose of certain calculations, at least equal consideration should be given to the median for comparison purposes. As is usually the case, the median is defined as the value of the middle item (or the average of the two middle items) of a group of values when they are arrayed from largest to smallest. The advantage of the median is that it provides a measure of central tendency that is not unduly influenced by a few very high or very low data (in this case, atypical annual incomes). The first decile, the first quartile, the third quartile, and the ninth decile are measures of dispersion. The first decile is defined as that value in an array of figures below which 10% of the cases fall. The first quartile is defined as that value in an array of figures from largest to smallest below which 25% of the cases fall. The third quartile is the value below which 75% of the cases fall. The ninth decile is the value below which 90% of the cases fall. Base Annual Salary is defined as the individual's income from his/her primary, full-time position as of the effective date of the survey. Total Annual Cash Compensation is defined as base annual salary, plus all cash bonuses and/or cash profit sharing received during the most recently-completed fiscal year. |
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