DOCUMENTATION FOR WEEKLY INDIVIDUAL WAGE AND SALARY INCOME FROM THE CENSUS This text file contains an explanation of the weekly individual wage and salary income file (census_wklywage). These data were calculated using the Census variable "incwage" which measures individual weekly wage and salary income from the previous year. We created a variable "wklywg" by dividing the respondent’s annual wage and salary income from the previous year ("incwage") by the total number of weeks they worked the previous year ("wkswork"). Note that in 1970, wkswork is not a continuous variable but is instead grouped into categories (e.g., 1-13 weeks). We recoded these categories into their midpoints. These data are taken from the Integrated Public Use Microdata Series: http://www.ipums.umn.edu/usa/ The data are organized in state-year format. There are 4 observations (1970, 1980, 1990 and 2000) for each state, plus the District of Columbia and an observation with the total for the US (= 208 records). All earnings data have been adjusted to 2002 dollars using the CPI deflator for all urban consumers. The columns of the text file are separated by spaces and do not contain variable names; in these text-format files, state names are surrounded by quotation marks and two-word names contain spaces (e.g.,"New York"). The variables in the data appear in the following order: 1. statename 2. stcode - Two-letter state postal abbreviation 3. year 4. p10wklywg - 10th percentile of total weekly wage & salary income (all) 5. p20wklywg - 20th percentile of total weekly wage & salary income (all) 6. p30wklywg - 30th percentile of total weekly wage & salary income (all) 7. p40wklywg - 40th percentile of total weekly wage & salary income (all) 8. p50wklywg - 50th percentile (median) of total weekly wage & salary income (all) 9. p60wklywg - 60th percentile of total weekly wage & salary income (all) 10. p70wklywg - 70th percentile of total weekly wage & salary income (all) 11. p80wklywg - 80th percentile of total weekly wage & salary income (all) 12. p90wklywg - 90th percentile of total weekly wage & salary income (all) 13. meanwklywg - average total weekly wage & salary income (all) 14. minwklywg - Minimum total weekly wage & salary income (all) 15. maxwklywg - Maximum total weekly wage & salary income (all) 16. sdwklywg - Standard deviation of total weekly wage & salary income (all) 17. ineqwklywg - Ratio of the 90th percentile of total weekly wage & salary income to the 10th percentile of total weekly wage & salary income (all) 18. gini_wklywg - Gini coefficient for total weekly wage & salary income (all) 19. n_wklywg - Number of non-missing values (all) 20. nwgt_wklywg - Weighted number of non-missing values (all) 21. men_p10wklywg - 10th percentile of total weekly wage & salary income (men) 22. men_p20wklywg - 20th percentile of total weekly wage & salary income (men) 23. men_p30wklywg - 30th percentile of total weekly wage & salary income (men) 24. men_p40wklywg - 40th percentile of total weekly wage & salary income (men) 25. men_p50wklywg - 50th percentile (median) of total weekly wage & salary income (men) 26. men_p60wklywg - 60th percentile of total weekly wage & salary income (men) 27. men_p70wklywg - 70th percentile of total weekly wage & salary income (men) 28. men_p80wklywg - 80th percentile of total weekly wage & salary income (men) 29. men_p90wklywg - 90th percentile of total weekly wage & salary income (men) 30. men_meanwklywg - average total weekly wage & salary income (men) 31. men_minwklywg - Minimum total weekly wage & salary income (men) 32. men_maxwklywg - Maximum total weekly wage & salary income (men) 33. men_sdwklywg - Standard deviation of total weekly wage & salary income (men) 34. men_ineqwklywg - Ratio of the 90th percentile of total weekly wage & salary income to the 10th percentile of total weekly wage & salary income (men) 35. men_gini_wklywg - Gini coefficient for total weekly wage & salary income (men) 36. men_n_wklywg - Number of non-missing values (men) 37. men_nwgt_wklywg - Weighted number of non-missing values (men) 38. wom_p10wklywg - 10th percentile of total weekly wage & salary income (women) 39. wom_p20wklywg - 20th percentile of total weekly wage & salary income (women) 40. wom_p30wklywg - 30th percentile of total weekly wage & salary income (women) 41. wom_p40wklywg - 40th percentile of total weekly wage & salary income (women) 42. wom_p50wklywg - 50th percentile (median) of total weekly wage & salary income (women) 43. wom_p60wklywg - 60th percentile of total weekly wage & salary income (women) 44. wom_p70wklywg - 70th percentile of total weekly wage & salary income (women) 45. wom_p80wklywg - 80th percentile of total weekly wage & salary income (women) 46. wom_p90wklywg - 90th percentile of total weekly wage & salary income (women) 47. wom_meanwklywg - average total weekly wage & salary income (women) 48. wom_minwklywg - Minimum total weekly wage & salary income (women) 49. wom_maxwklywg - Maximum total weekly wage & salary income (women) 50. wom_sdwklywg - Standard deviation of total weekly wage & salary income (women) 51. wom_ineqwklywg - Ratio of the 90th percentile of total weekly wage & salary income to the 10th percentile of total weekly wage & salary income (women) 52. wom_gini_wklywg - Gini coefficient for total weekly wage & salary income (women) 53. wom_n_wklywg - Number of non-missing values (women) 54. wom_nwgt_wklywg - Weighted number of non-missing values (women) 55. cpideflator - Deflator used to adjust values for inflation (this is provided so that the user may calculate the unadjusted values). This deflator uses the consumer price index and is uniform for all states. 56. statecpi - This is a state-specific deflator from 1963 to 2000, except for Alaska and Hawaii. A description of how this deflator was created can be found in Berry, William D., Richard Fording and Russell Hanson, "An annual cost of living index for the American states, 1960-1995", Journal of Politics, 62:550-567. The updated deflator files can be found at http://www.icpsr.umich.edu:8080/ICPSR-STUDY/01275.xml UNIVERSE: The universe for wklywg is the same for personal annual wage and salary income (incwage): it includes only private and government employees. We excluded respondents who reported working 0 weeks in the previous year and those reporting wage and salary income of $1 or less. WEIGHTING: Weighted estimates were produced using "perwt".