Table 2. Difference ratio between hourly wage percentiles calculated with individual worker data and with occupational averages data: 15 areas from National Compensation Survey, 1997

Table 2. Difference ratio(1) between hourly wage percentiles calculated with individual worker data and with occupational averages data: 15 areas from National Compensation Survey, 1997
Occupational Group	Percentile
Occupational Group	10th	25th	50th	75th	90th
All	0.045	0.030	0.004	-0.011	-0.023
Blue Collar	0.032	0.024	-0.003	-0.007	-0.019
White Collar	0.053	0.035	0.004	-0.014	-0.026
Service	0.042	0.019	0.006	-0.001	-0.020
Footnotes: (1) Weighted average over occupations of (wa-wm)/wm, where wa = the wage rate at the given percentile using occupational average data and wm = the wage rate at the given percentile using individual worker microdata.