Data presented in these trend tables are derived from the National Science Foundation Survey of Doctorate Recipients (SDR). These Web trend tables are intended to display changes in selected characteristics among science and engineering doctorate holders in the United States, such as demographics, employment and salaries.
The estimates in these tables are also available in the Characteristics of Doctorate Scientists and Engineers report series for 1993, 1995, and 1997. Users can refer to the Characteristics reports for trends not shown in these tables. More trend tables will be added in the future based on the need.
The 1993 and 1995 estimates in these trend tables may show small differences from the estimates in the respective Characteristics reports for those years because the trend tables use estimates from the respondents' most recent doctorate degree field, not their first doctorate as in the Characteristics reports. Also, fields of study are aggregated differently in the 1997 Characteristics report, and these trend tables put the 1993 and 1995 data into the new 1997 field of study groupings.
Please see "Important Notes on the Tables" in the Technical Notes section in the Characteristics of Doctorate Scientists and Engineers: 1997 for more detail on the changes in the way major fields are presented. Also, due to significant survey redesign introduced in 1993, comparisons of the 1993-1997 data to the 1991 data or prior years are not advisable. See the Technical Notes for information on the sample design and sampling error for the estimates presented in these trend tables. Also, the groupings for field and occupation can be found in Appendices B and C.
For further information, please contact:
Survey of Doctorate Recipients