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APPENDIX C: Technical Notes
SURVEY RESPONSE RATES*
Self-Report Self-Report
Year Rate Year Rate
1965 97.4 1981 95.7
1966 96.3 1982 95.3
1967 97.3 1983 95.5
1968 97.6 1984 95.1
1969 96.6 1985 94.8
1970 98.1 1986 93.5
1971 97.5 1987 93.1
1972 97.3 1988 92.9
1973 97.5 1989 92.3
1974 94.2 1990 93.6
1975 97.3 1991 94.6
1976 97.2 1992 95.1
1977 96.6 1993 94.7
1978 96.3 1994 94.6
1979 96.4 1995 94.1
1980 96.2 1996 92.8
* The rates for 1965-1995 reflect late responses. The rate for 1996 may increase slightly
In We next year if additional questionnaires are received after survey closure. Self-report rates for
1980-1996 are determined Dom We "source of response" indicator In We doctorate records.
Because this indicator was not coded prior to 1980, survey forms for 1965-1979 are assumed to be
self-reported if "mono signed" or "marital status" is present. "Marital status" is not available Tom
sources over Wan We doctorate recipient.
As shown above, 92.8 percent of all doctorate recipients in 1996 completed survey forms;
this percentage is referred to as the "self-report" rate. For the remaining 7.2 percent of recipients,
"skeletal" forms were created with information from doctorate-granting institutions or commence-
ment programs. Whether or not individuals completed the survey questionnaire, the following four
data items are available for all recipients: gender, Ph.D. institution, Ph.D. field, and Ph.D. year.
This report presents data obtained from all survey forms, both self-reported and skeletal.
Readers should note that nonresponse in a tabulation varies according to the combination of selected
variables. Higher nonresponse rates occur when any of the four variables mentioned above are
cross-tabulated with another variable (e.g., educational debt) because the universe consists of the
entire doctoral cohort. In other words, the 7.2 percent of Ph.D.s who did not respond to the survey
are included even though their records contain minimal information. Nonresponse is generally lower
when citizenship or race/ethnicity is cross-tabulated with a variable such as debt because the
population is restricted to a group (e.g., U.S. citizens) that is largely drawn from self-reported forms
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and thus more likely to have responses to the debt question. To be more precise, information on debt
was not available for only 5.7 percent of U.S. citizens in ~ 996; nonresponse was low because data on
both citizenship and debt were obtained mostly from self-reported forms. Nonresponse was higher
for the entire ~ 996 cohort (8.9 percent) because it included the 7.2 percent of forms that were only
partially filled in by institutions or staff of the National Research Council. The same was true for
men (9. ~ percent) and women (8.5 percent) because gender was known even for Ph.D.s who did not
complete a survey form. Cross-tabulating debt with field of doctorate would yield similarly high
nonresponse rates because Ph.D. field is available for all recipients.
.
The percentages shown in the tables and figures in the body of this report are based only on
Me number of doctorate recipients who responded to the applicable survey questions. 1 Appendix C
presents nonresponse rates for the variables included in these tables and figures; it also provides
descriptive explanations of the data as needed. For additional technical information, please contact:
Doctorate Data Project
National Opinion Research Center
~ ~ 55 East 60~ Street
Chicago, ~ 60637
Phone: (773) 753-7500
Fax: (773) 753-7886
E-mail: 4800-sed~norcmail.uchicago.edu
~ Note that the percentages in Appendix Tables A-3 and A-4 are based on the total doctoral cohort because
categories for "unlmown" responses are included. See the notes in front of Appendix A for further explanation of
these data.
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Baccalaureate Institutions of U.S. Minorities
Table 9 is restricted to U.S. minority Ph.D.s (native and naturalized citizens) Dom 1992 to
1996 who earned baccalaureates at institutions located in the United States. Because this population
constitutes only 89.0 percent of all U.S. minority Ph.D.s in this period, the totals shown in Table 9
for each group are not all inclusive. Another 9.2 percent mostly naturalized Asians and
Hispanics received baccalaureates Dom foreign institutions, and the remaining I.8 percent either
did not earn a baccalaureate degree or did not report this information. The totals for all U.S. minority
Ph.D.s regardless of baccalaureate status are: 4,920 Asians (56.9 percent naturalized); 5,807 blacks
(~.4 percent naturalized); 4,365 Hispanics (20.0 percent naturalized); and 747 American Indians (0.S
percent naturalized).
Country of Citizenship (for non-U.S. Ph.D.s)
Country of citizenship (if missing) was first followed up in the ~ 990 survey. Consequently,
nonresponse has been much lower in recent years than prior to 1990. Nonresponse was only ~ .5
percent in ~ 996, compared to 9.9 percent in ~ 989. Table ~ 3 presents data on country of citizenship.
Posigraduation Plans
Postgracluation status: The question on postgraduation status asks recipients to indicate whether
they have made a "definite" cornrnitment, are in the process of "negotiating" with one or more
organizations, or are seeking a position but have no specific prospects. Because Ph.D.s sometimes
complete the survey form months ahead of graduation, it is not possible to determine the final plans
of all recipients. It is quite likely that some individuals who check "negotiating" or "seeking" have
obtained positions by the time of graduation. Tables 20 and 21 compare the proportion of Ph.D.s
with "definite" plans and those still "seeking." Other data on postgraduation plans in this report are
restncted to the group of Ph.D.s who reported "definite" plans.2
Definite commitments: Tables 22 through 27 include only those Ph.D.s who reported definite post
. .
grac Eaton commitments and therefore do not reflect the entire Ph.D. population.
Postdoctoral location: Revisions to the survey form have resulted in significant increases in
response rates for postdoctoral location during the past few years. Doctorate recipients can now
check a box for "U.S." or "non-U.S." instead of providing the name and exact location of the
organization with which they will be affiliated after the doctorate. This explains the much lower
nonresponse since 1995 than in earlier years shown in Tables 24 through 27. See chart of item
nonresponse rates for details.
2 Comparisons with the longitudinal Survey of Doctorate Recipients (SDR) show the data on "definite"
postgraduation plans to be a reasonable indicator of the actual employment status of new Ph.D.s in the first year or
so following receipt of the doctorate. (The SDR also conducted by the National Research Council, is a follow-up
employment survey of a sample of doctorate recipients in science, engineering, and humanities fields.)
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NONRESPONSE RATES FOR ITEMS IN TABLES
Data Item Tables 1966 1971
Baccalaureate Institution (for U.S. minorities)
Citizenship
County of Citizenship (for non-U.S. citizens)
Debt Status
Doctorate Field
Doctorate Institution
Doctorate Year
Gender
Postdoctoral Location (for definite commitments)
Non-U.S. citizens Early type of plans)
U.S. citizens & permanent visas (employment plans)
Temporary visas (employment plans)
Postdoctoral Plans (e.g., definite
employment vs. study)
Postdoctoral Sector (for definite employment In U.S.)
U.S. citizens & permanent visas
Temporary visas
Postdoctoral Status (e.g., definite vs. seeking)
Primary Source of Graduate School Support
Race/E~nicity
U.S. citizens
U.S. citizens & permanent visas
Registered Time to Doctorate (computed)
Total Time to Doctorate (computed)
Table 9
Tables 7-14, 16, 17, 19, 21, 23-27
x x
2.4 1.6
Tables 12, 13
Tablesl8,19xx
Tables4,5,7,8,11,15-18,20,0.00.0
22, 25, 26
x x
Table 10, 14xx
All tables0.00.0
Tables5,6, 16, 17, 19,21,23,270.00.0
Tables 24, 25
Tables 26, 27
Table 27
Tables 22, 23, 25-27
Tables 26, 27
Table 27
Tables 20-27
Table 17
Tables 7-10, 16, 17, 19
Tables 21,23, 27
Tables 15, 16
Tables 15, 16
xx
xx
xx
xx
xx
xx
xx
xx
xx
xx
x7.4
x1.7
NOTE: In 1996, 92.8 percent of new doctorate recipients completed the survey form. The item nonresponse rates in this table
include the 7.2 percent of recipients who were not self-reporting. Because missing information is sometimes obtained from the
doctorate-granting institutions or commencement programs, nonresponse rates for the following variables may be lower than the
survey's 7.2 percent rate of nonresponse: citizenship, gender, race/ethnicity, baccalaureate institution, and total time to doctorate
(derived from baccalaureate year). Field, institution, and year of doctorate are available for all recipients, as is gender.
x = Year not shown in tables and figures.
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NONRESPONSE RATES FOR ITEMS IN TABLES (Continued)
.
1992
197619811986199119961996 Data Item
xxxxx1.8 Baccalaureate Institution (U.S. minorities)
2.03.46.62.13.12.5 Citizenship
xxx2.01.5x County of Citizenship (for non-U.S. citizens)
xxxx8.8x Debt Status
0.00.00.00.00.0x Doctorate Field
xxxx0.0x Doctorate Institution
0.00.00.00.00.00.0 Doctorate Year
0.00.00.00.00.0x Gender
Postdoctoral Location (for definite commitments)
3.75.98.33.10.4x Non-U.S. citizens (any type of plans)
2.65.06.31.00.2x U.S. citizens & permanent visas (employment plans)
3.66.18.03.20.4x Temporary visas (employment plans)
0.80.30.50.40.2x Postdoctoral Plans (e.g., definite employment vs. study)
Postdoctoral Sector (for definite employment in U.S.)
0.50.61.01.00.6x U.S. citizens & permanent visas
0.00.00.00.60.4x Temporary visas
68.19.28.59.1x Postdoctoral Status (e.g., definite vs. seeking)
x x x x 12.1 x Primary Source of Graduate School Support
Race/Ethnicity
4.0 4.2 1.8 1.9 1.2 1.1 U.S. citizens
4.5 4.1 2.0 2.0 1.2 x U.S. citizens & permanent visas
9.2 11.9 15.3 16.0 19.9 x Registered Time to Doctorate (computed)
1.9 3.4 7.2 4.5 5.3 x Total Time to Doctorate (computed)
x = Year not shown in tables and figures.
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Postdoctoral employment commitments in the U.S.: To be included in Tables 26 and 27,
Ph.D.s must have reported definite commitments for employment. Foreign locations and
employers are excluded. For temporary residents a U.S. location must have been reported.
For U.S. citizens and permanent residents, unknown locations are assumed to be in the
United States because of the high "stay" rates for both groups. Based on actual responses to
the ~ 996 survey, 97 percent of U.S. citizens with employment or study commitments
intended to remain in the United States, as did 92 percent or more of permanent residents.
Primary Source of Graduate Schoo!Support
In 1995 the response rate to the question on primary sources of financial support was 74.S
percent. In ~ 996 the response rate jumped to 87.9 percent. This increase in response was
due to a revision of the questions on sources of support. In 1995 and earlier years the
questionnaire asked the respondent to identify ant! rank their sources in one question. The
1996 questionnaire asked the respondent to identify all sources of support in one question
and in a separate question asked them to indicate their primary and secondary sources. The
new separate question on primary/secondary sources also provided the opportunity to denote
that the doctorate recipient had no primary or secondary source of support.
Race/Ethr~icity
Adjustments to numbers: Readers should keep in mind that fluctuations in numbers for a
racial/ethnic group reflect to some degree any upward or downward change in both overall
survey response and response to the racial/ethnic item. Since 1990 response to race/ethnicity
has shown great improvement a result of new procedures for following up missing
information. Race/ethnicity was not followed up prior to ~990.
All follow-up responses received before survey closure are included in the data
presented in the Summary Report for that survey. Responses arriving after closure are
included in the next year's report. The extension of survey closure dates in the past four
years has allowed most follow-up responses to be received in time to be included in the
Summary Reports for those surveys. Postsurvey adjustments were greatest for 1990 and
1991 data, much less for 1992, and minimal for 1993. In 1994 response to the racial/ethnic
item reached 97 percent by survey closure the highest rate ever. Any postsurvey
adjustments for ~ 996 data will be included in next year's report, but they are expected to be
very slight because of the extended closure. Updated numbers for all recent years appear in
Appendix Table B-2 in this report.
History of the racial/ethnic question: Although this item was first introduced to the Survey
of Earned Doctorates in 1973, over 25 percent of recipients in 1973 and about 13 percent in
~ 974 either completed earlier questionnaires or provided unusable responses. Since 1975 the
racial/ethnic data have been more reliable, with response rates ranging from 90.! to 97.!
percent (the latter in ~ 9941. The information on race/ethnicity presented in this report is
limited to the period 1977 to 1996.
The racial/ethnic question has undergone several revisions over the years. in ~ 977 it
was modified to correspond to a standard question format recommended by the Federal
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Interagency Committee on Education and adopted by the Office of Management and Budget
(OMB) for use in federally sponsored surveys, an explanation of the effect of these changes
is detailed on page 13 of Summary Report 1977. (Note: Changes in the OMB guidelines
prompted the reclassification of persons having origins in the Indian subcontinent from the
white category to the Asian category.) In ~ 980 the question was further revised in two ways:
(~) the Hispanic category was subdivided into Puerto Rican, Mexican American, and other
Hispanic, and (2) respondents were asked to check only one racial category. (Before 1980
doctorate recipients could check more than one category to indicate their race.) The item
was modified again in ~ 982 to separate the questions on race and ethnicity. Since then,
respondents have been asked to first check one of the four racial group categories (American
Indian, Asian, black, or white) and then indicate whether or not they are Hispanic. In this
report, Ph.D.s who reported Hispanic heritage are ciassife`l as Hispanic regardless of their
racial designations; the remaining Ph.D.s are then counted in the respective racial groups.
(Note: Doctorate recipients who checked the category "American Indian or Alaskan Native"
are identified as "American Indian" in this report.)
Time to Doctorate
Total time to degree (TTDJ: TTD measures the total elapsed time between the baccalaureate
and the doctorate (including time not enrolled in school). TTD can be computed only for
individuals whose baccalaureate year is known. Baccalaureate year is often obtained from
commencement programs or doctorate institutions when not reported by the recipient.
Months are now included in the computation (see note belong.
Registered time to degree (RTDJ: RTD gauges the time in attendance at colleges and
universities between receipt of the baccalaureate and the doctorate. Enrollment may include
years of attendance not related to a recipient's doctoral program. RTD can only be computed
for individuals who have provided all years of college attendance after the baccalaureate.
Months are now included in the computation (see note belowJ.
Note about medians: The method of computing medians has been revised. Beginning with
Summary Report ~994, months (of birth, baccalaureate, and doctorates are included in the
calculations whenever available; if months are missing, only years are used in the
calculations. (However, medians are not computedfor years prior to 1969 because
doctorate month is unavailable for aR Ph.D.s.J Medians presented in previous Summary
Reports were based only on years. Some medians would be the same regardless of the
method of computation, but the new method generally computes slightly different results.
While differences are small (usually one- or two-tenths of ayearJ, readers should consider
these differences when comparing medians presented in this report with those in earlier
reports.
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Representative terms from entire chapter:
nonresponse rates