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Employment Sector, Salaries, Publishing, and Patenting Activities of S&E Doctorate Holders
This InfoBrief draws upon the National Science Foundation's 2001 Survey of Doctorate Recipients (SDR) to describe the broad employment sectors of the U.S.-trained doctoral science and engineering (S&E) workforce and some of their employment outcomes, particularly salaries, publications, and patent applications. The 2001 data are compared with results from the 1995 SDR, which also collected information on these outcomes.
As defined in the SDR and throughout this InfoBrief, the U.S.-trained doctoral S&E workforce consists of those who have earned S&E doctorates from U.S. institutions and who are employed in the United States. This population has grown significantly (over 18 percent) since the mid-1990s, increasing from about 485,000 persons employed full or part time in 1995 to almost 575,000 in 2001.
The doctoral S&E workforce in 2001 was distributed across three main employment sectors: education (46 percent), industry (45 percent), and government (10 percent). This distribution is broken down into five broad categories of doctoral study fields in table 1. In 2001, the education sector employed over 50 percent of those earning their doctorates in computer and mathematical sciences (53 percent), life sciences (55 percent), and social sciences (which include psychology Ph.D.s) (52 percent). In contrast, a majority of doctoral engineers (65 percent) and physical scientists (53 percent) were employed in industry in 2001.
Comparing the records from the 1995 and 2001 SDR studies, the absolute numbers of S&E doctorate holders increased in all three sectors since 1995. The gains relative to the 1995 numbers were greater in some sectors and for certain doctoral fields. The number employed in industry grew the most over the period with an increase of 27 percent since 1995. In contrast, the increases in the numbers employed in education and government were 1214 percent of the 1995 totals. Overall, the S&E doctoral labor force became less concentrated in education and more concentrated in industry between 1995 and 2001 (table 1).Table 1 Source Data: Excel file
The numbers of doctoral-level workers increased from 1995 to 2001 in each of the five broad S&E fields. The increases were greatest in computer and mathematical sciences (26 percent increase), life sciences (23 percent), and engineering (27 percent). The numbers of doctorate holders in physical sciences and social sciences in the workforce increased by 10 and 15 percent, respectively (table 1).
Examining the patterns of change across employment sectors for each broad field, the proportions of doctorate holders in computer and mathematical sciences, physical sciences, life sciences, and engineering employed in industry increased from 1995 to 2001. These relative gains were mainly complemented by decreases in the proportions employed in education from 1995 to 2001 (table 1).
Salary Differences by Sector and Specialization
For the S&E doctoral workforce overall, median annual salaries in 2001 were highest among the full-time employed in the industry sector ($92,000), followed by those in government ($78,000), and then those in education ($63,000). Those employed in industry also had the highest median salary when sector comparisons are made among the S&E doctorate holders who had earned their degrees 10 or more years ago (referred to here as the "older cohort"), and among the newer doctorate holders who earned their degrees within the last 10 years (the "newer cohort").
Within the education sector, doctorate holders in engineering were the highest paid group, and the differences among the other broad fields were not statistically significant. Within the government sector, those who earned doctorates in the computer and mathematical sciences, physical sciences, and engineering had higher median salaries than those in the life and social sciences. In industry, doctorate holders in computer and mathematical sciences and engineering had the highest median salaries in 2001, with those in physical sciences following closely behind (table 2).Table 2 Source Data: Excel file
The 1995 median salaries reported in table 2 are adjusted for inflation to compare them with 2001. The median annual salaries of the full-time employed S&E workforce increased from 1995 to 2001 overall and within each of the three employment sectors. Median salaries increased in constant dollars by 10 percent in both government and industry, and by 4 percent in education. Salaries for the newer doctoral cohort increased by 13 percent in industry, compared to 8 percent in government; there was no salary increase for the newer cohort in education after adjusting for inflation. In contrast, the older cohort saw real average salary gains of 68 percent in all three employment sectors.
Real salary gains from 1995 to 2001 varied by field of doctorate. The median salary of computer and mathematical sciences doctorate holders increased from $69,700 in 1995 to $80,000 in 2001 in constant dollars, or 15 percent, while the increases were 6 percent for life sciences, 8 percent for physical sciences, 5 percent for social sciences, and 11 percent for engineering doctorate holders. The median salary increases for the newer doctoral cohort were 28 percent in the computer and mathematical sciences, about 15 percent in the physical sciences and engineering, and 5 percent in life science. There was no change in the inflation-adjusted median salary of social scientists in the newer doctoral cohort.
Among the newer doctoral cohort, the real median salary gains between 1995 and 2001 for the different broad fields were largely confined to those employed by industry. Only engineering registered a statistically significant increase in median salary for the newer cohort within the education sector, and physical scientists had the only statistically significant increase in government. In contrast, social scientists were the only group not to show a statistically significant gain among those employed in industry.
The median real salary increases in constant dollars for the older doctoral cohorts were 11 percent in computer and mathematical sciences, 8 percent in engineering, 7 percent in life sciences, and 6 percent each in social sciences and physical sciences. Statistically significant gains among members of the older doctoral cohort employed in the education sector were realized by life sciences and social sciences. The only statistically significant gain in median salary for the older cohort working in government was attained by the physical sciences. In industry, median salaries of the older cohort for those with doctorates in life sciences, physical sciences, and engineering showed statistically significant increases, while those for computer and mathematical sciences and social sciences did not.
Presentations and Publications
The 2001 SDR posed a series of questions on professional activities. Respondents were asked to provide the numbers of conference presentations made, publications generated, and patents applied for and obtained since April 1995. The last time comparable data were collected was in 1995, but the questions in that year used a 5-year reference span instead of a 6-year period (i.e., asking respondents about their activities since April 1990). This difference means that the counts would be slightly higher in 2001 than the 1995 counts if the levels of such activity were similar in the two periods. However, this was not the case, and reported publication activity was lower (77 percent of all science and engineering doctorate holders compared to 74 percent) in the later period.
In 2001, 86 percent of the S&E doctorate holders employed in education reported one or more presentations or published articles, compared to 74 percent in government and 61 percent in industry (table 3). The breakdowns by doctoral field and employment sector show that, in the 2001 survey, the proportions reporting publication-related activity were similar across doctorate fields for those working in education (8290 percent). In the government and industry sectors, social and related sciences doctorate holders were substantially less likely than those in other disciplines to pursue publication activities. This disparity largely reflects the lack of publication-related activities on the part of those with psychology doctorates, many of whom are working as professional practitioners rather than researchers; the other social science disciplines are close to the sector averages (tabulations not shown here).Table 3 Source Data: Excel file
Comparing the 2001 numbers with those from 1995, it appears that the doctoral S&E workforce was slightly less likely in 2001 to report publication-related activity over the 6-year period than were their 1995 counterparts over the 5-year period from 1990 to 1995. Even without any adjustment for the differences in reference periods, the overall decline was statistically significant, as were the declines in the education and industry employment sectors and in all five broad fields of doctorate specialization.
Why the overall decline in publication activity occurred is not obvious and is an important topic for further research. Past research has shown that publication activities tend to be highest in the early stages of the S&E doctorate holders' careers. The SDR data show that pattern for individuals employed both in education and in industry. The proportional representation of younger cohort members in the education sector did not change and actually increased in the industry sector from 1995 to 2001. The lower rates of publication in 2001 were evident both for newer cohort and older cohort members in the education and industry sectors. (These additional tabulations are available upon request).
Patent Applications and Patents Granted
The 2001 SDR questionnaire asked respondents, "Since April 1995, have you been named as an inventor on any application for a U.S. patent?" Those who responded yes were asked to provide the numbers of patents applied for, patents granted, and patents granted that "resulted in commercialized products or processes or have been licensed." The same set of questions, but with a reference date of April 1990 (that is, a 5-year instead of a 6-year span), was also asked in 1995.
Patent-related activities were markedly less frequent among the S&E doctoral workforce than were publication-related activities and were pursued by only about 16 percent of this population in 2001. S&E doctorate holders in industry were much more likely than those employed in education or government to have been named as an inventor on a U.S. patent application or award. In 2001, about a fourth (25 percent) of S&E doctorate holders in industry reported having engaged in one or more patenting activities during the past 6 years, compared to 8 and 9 percent in education and government, respectively (table 4).Table 4 Source Data: Excel file
In 2001, engineering doctorate holders were the most likely to have engaged in patent-related activities, whereas social science doctorate holders were by far the least likely. In all five broad doctoral fields, those employed in industry were more likely to be involved in patent-related activities than those employed in the other sectors. Among those employed in industry in 2001, engineering and physical sciences doctorate holders were more likely to report having applied for and/or obtained patents (38 percent and 37 percent, respectively) than were those in the remaining fields. Within the education sector, those with engineering doctorates were the most likely to have applied for and/or obtained patents.
Patent-related activities were reported by a higher percentage of the doctoral workforce in 2001 than in 1995 (16 versus 12 percent), but the apparent increase may be exaggerated slightly by the different reference periods used in the 2001 and 1995 surveys. With that caveat, the reported percentages of patenting activity were higher in 2001 than 1995 in all three sectors and all five broad fields. In the broad fields of specialization, patenting activity increased the most among the computer and mathematical science doctorate holders, who went from 6 to 13 percent overall in reporting patenting activity, and among engineering doctorate holders, who increased from 25 to 31 percent.
Among 575,000 total S&E doctorate holders in the workforce in 2001, about 46 percent worked in education, 45 percent in industry, and 10 percent in government. In recent years, the doctoral S&E workforce has expanded. Over the period from 1995 to 2001, the S&E doctorate workforce grew in all sectors of the economy, but employment in industry increased the most.
The growth in the doctoral S&E workforce coincided with increases in real annual salaries. Median salary gains since 1995 were greatest in the newer doctoral cohorts among those employed in industry, especially for those who earned their doctorates in computer and mathematical sciences, engineering, and physical sciences. Salaries have been relatively flat for those in the newer doctoral cohorts employed in the education sector.
Comparisons of the 1995 and 2001 SDR publication data indicate declining rates of involvement in publication-related activities. Declines in publication-related activities were observed in the education and industry employment sectors and in all five broad fields of doctorate specialization.
For further information about this InfoBrief, the Survey of Doctorate Recipients, or related reports, contact
 Thomas B. Hoffer is Principal Research Scientist at the National Opinion Research Center, University of Chicago.
 The 2001 data are the most recent available.
 Self-employed individuals and those working for private nonprofit organizations are included in the industry sector.
 The SDR requests detailed information from respondents on their fields of specialization both in terms of their doctorate degree programs and their current occupations. As used here, however, "field" refers exclusively to field of doctorate, aggregated into five broad areascomputer and mathematical sciences, life and related sciences, physical and related sciences (includes the earth, atmospheric, and ocean sciences as well as chemistry, physics, and astronomy), social and related sciences (including psychology), and engineering.
 The analysis of salaries is confined to the full-time employed workforce in order to improve comparability between doctorate fields and survey years.
 This section tabulates conference presentations made and journal articles published, which are summarized here and in table 3 as dichotomous indicators of publication activity (i.e., whether an individual presented or published one or more times in the designated time period).
 The 2001 SDR included an additional question, not asked in 1995, about the number of books or monographs the respondents had published since 1995. A fifth (21 percent) of those in the education sector reported publishing one or two books or monographs, followed by 14 percent in government and 10 percent in industry.
 A decline in the number of scientific and technical articles published by United States authors is also documented in National Science Board, Science and Engineering Indicators 2002 (Arlington, VA: National Science Foundation, 2002, NSB-02-01), Chapter 5, pp. 39-41; this report also provides a useful discussion of possible reasons for the decline.
 See P.E. Stephan and S.G. Levin, Striking the Mother Lode in Science. New York: Oxford University Press, 1992.
 Patent-related activities are, like publication-related activities, summarized in this report with a single dichotomous indicator of whether the individual applied for or was granted a patent during the referent period (since April 1995 for the 2001 SDR; since April 1990 for the 1995 SDR). The percentages responding that they had applied for or were granted one or more patents are broken down by employment sector and doctoral field in table 4.
 The apparent increase in patenting activity for the S&E doctorate population is consistent with the increases in the numbers of patents granted to U.S. inventors in the period 1995-99 compared to the period 1990-94 documented in National Science Board, Science and Engineering Indicators 2002 (Arlington, VA: National Science Foundation, 2002, NSB-02-01), pp. 6-21.