Appendix E
1999 IPEDS (Fall Enrollment)
Survey Methodology
Overview
Fall 1999 enrollment data collected through the National Center
for Education Statistics (NCES) represent 3,958 degree-granting
postsecondary institutions that are eligible to participate in
Title IV programs (financial aid) in the United States. Table
E1 includes only those institutions in the 50 states and the
District of Columbia. The 1999 Fall Enrollment survey (either
EF1 or EF2) was sent to the universe institutions accredited at
the collegiate level and to all other institutions offering a
bachelor's, master's, doctor's or first-professional degree. The
Fall Enrollment (EF) survey is conducted annually as part of the
National Center for Education Statistics' Integrated Postsecondary
Education Data System (IPEDS). Eligibility status of institutions
was obtained from the Office of Postsecondary Education's 1998
Postsecondary Education Participants System (PEPS) file.
The 1999 Fall Enrollment Survey data currently available in
a peer tool on the NCES web site do not permit national estimates.
The peer tool includes only those institutions that reported data
that passed various edit checks. To calculate national totals,
data for nonresponding institutions were imputed using procedures
described in this appendix and added to data reported by institutions.
Students included in the Fall Enrollment survey were students
enrolled in courses toward a degree or other formal award; students
enrolled in courses that are a part of a vocational or occupational
program, including those enrolled in off-campus centers; and high
school students taking regular college courses for credit. Students
excluded from the Fall Enrollment survey were students enrolled
exclusively in courses not creditable toward a formal award and
not in a postsecondary vocational program, students enrolled exclusively
in remedial courses; students exclusively auditing classes; students
studying abroad (e.g., at a foreign university) if their enrollment
at the institution is only an administrative record and the fee
is only nominal; and students in any branch campus located in
a foreign country; and students earning continuing units (CEU's)
only.
There are two versions of the Fall Enrollment survey. The most
extensive form, EF1, was sent to all 4-year institutions. The
EF2 form is less detailed and was sent to 2-year postsecondary
institutions that grant an associate's degree (degree-granting).
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Universe, Institutions Surveyed and Response Rates
A universe of postsecondary institutions was initially established
as being eligible to participate in Title IV programs by the IPEDS
1998-99 Institutional Characteristics Survey. Fall Enrollment
Survey forms were mailed in July 1999. The survey results were
collected from November 1999 through June 2000. During this time
period, some institutions determined to be out-of-scope were deleted
from the universe. These deletions resulted from formal notification
by IPEDS state coordinators, the Department of Education eligibility
notices, and from follow-up telephone calls. Included in the deletions
were (1) duplicates of other institutions on the file; (2) institutions
that no longer offered postsecondary programs; or (3) schools
that did not conform to the IPEDS definition of an institution
or branch. At the end of the process, 3,958 institutions were
in the final 1999 fall enrollment universe. The final universe
was also adjusted to reflect institutions that changed from one
sector to another subsequent to survey mail out.
Table E2 shows the number of
institutions that responded to the mail out of the 1999 Fall Enrollment
survey by level and their enrollment. It also reports the total
number of institutions in the survey universe, and the final imputed
enrollment. The table shows the response rate as the proportion
of the survey universe that reported to the survey both in terms
of counts of institutions and in terms of their enrollment.
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Survey Conduct and Editing
The 1999 Fall Enrollment survey was due November 15. Survey data
were collected via paper or transmitted NCES via the Internet.
Some institutions submitted data on diskette. Data for nonresponding
less than 2-year institutions were collected through the Postsecondary
Education Telephone System (PETS). All data, whether received
on paper forms, diskettes, electronically via the Internet, or
through the PETS system, went through the same editing process.
Extensive follow-up for survey nonresponse was conducted from
November 1999 through April 2000. Initially, reminder letters
were mailed, encouraging nonresponding institutions to complete
and return their forms; and subsequently, the PETS was used to
collect critical data by telephone from an institutional representative.
Survey responses were edited for internal and inter-year consistency.
The following editing procedures were used:
Part A: Enrollment, by Sex and Race/ethnicity
Addition checks were performed by adding down the columns and
comparing generated totals with reported totals. If the reported
total differed from the generated total but was within a designated
range, the reported total was replaced by the generated total
and the cell was flagged with the proper impute code. If the difference
exceeded the designated range, institutions were contacted for
verification/correction. Addition checks were also performed by
generating totals for men and women by adding across columns (racial/ethnic
group) in each line. Generated totals by sex were compared to
the reported totals. If they differed but were within a designated
range, a balance field was created containing the difference by
sex and placed on the data file. Reported detail and totals were
not altered. If the difference exceeded the designated range,
institutions were contacted for correction. Editing of the racial/ethnic
data is explained in detail in the section on raking of racial/ethnic
data. Comparisons were also made with the number of students reported
for the selected items for the prior year. If the differences
were sufficiently large to trigger an edit flag, institutions
were contacted for further verification.
Part B: Enrollment, by Age
Part B data were edited in a similar manner. Addition checks
were performed by comparing reported totals in Part B to corresponding
totals in Part A. Differences between the totals were calculated
and balances containing the differences were generated. If the
balance was outside a certain range, the institution was contacted
for verification/correction. If the balance was within a certain
range, the Part B total was replaced by the corresponding total
from Part A. The balance was then allocated among the age categories
using the institution's reported age distribution.
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Data Management and Imputation
The response rate for institutions was approximately 97 percent,
and these institutions accounted for more than 99 percent of enrollment.
Because the response rate was so high for the enrollment data,
a very straightforward process was followed for imputation. For
nonreporting institutions, data from the institution's prior 1998
Part A response was used as the imputation for fall 1999. In some
cases, the prior response was also an imputation. Because of the
extremely high representation of the larger institutions in all
major sectors of degree-granting institutions, any bias caused
by this procedure was considered to be minimal.
Data for Part B was imputed by using the distribution from the
1997 enrollment by age survey, and using that age distribution
for each institution to distribute their (reported or imputed)
fall 1999 enrollment by age.
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Raking of Data
When data were reported by racial/ethnic categories on a detail
line and the generated sum of these enrollments did not equal
the reported total enrollment, the difference between the generated
total and the reported total was calculated. If the difference
exceeded a certain designated range, the institution was contacted
for correction. If the difference was within the designated range,
a "balance column" was created. The balance column as well as
the "race unknown" column was then distributed in the same proportions
as the reported racial/ethnic data for that detail line. When
the racial/ethnic numbers were adjusted to full counts, there
were often lines that failed add checks because of rounding. The
largest figure in each row was adjusted by one or two, so that
the line added to the original reported total for that line.
Further information on tables E1 and E2 may be obtained from:
Thomas D. Snyder
Annual Reports Program
Early Childhood, International, and Crosscutting Studies Division
(ECICSD)
National Center for Education Statistics
1990 K Street NW
Washington, DC 20006
Tom.Snyder@ed.gov
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