Data
Iowa State U.
| Fields | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|
| All fields | 327 | 401 | 367 | 325 | 407 | 389 | 390 | 350 | 322 | 320 |
| Science and engineering | 285 | 362 | 328 | 293 | 366 | 341 | 325 | 285 | 275 | 270 |
| Agricultural sciences and natural resources | 33 | 46 | 32 | 34 | 38 | 35 | 31 | 30 | 21 | 25 |
| Agricultural sciences | 31 | 38 | 28 | 32 | 35 | 30 | 28 | 28 | 20 | 22 |
| Natural resources and conservation | 2 | 8 | 4 | 2 | 3 | 5 | 3 | 2 | 1 | 3 |
| Biological and biomedical sciences | 43 | 65 | 58 | 51 | 56 | 62 | 57 | 41 | 56 | 53 |
| Biochemistry and biophysics | 9 | 10 | 4 | 6 | 5 | 5 | 10 | 8 | 7 | 10 |
| Biology and biomedical sciences, general | 1 | 4 | 4 | 2 | 4 | 3 | 4 | 3 | 3 | . |
| Bioinformatics, biostatistics, and computational biology | 6 | 7 | 11 | 5 | 9 | 9 | 4 | 2 | 6 | 5 |
| Cellular and developmental biology, and anatomy | . | . | . | . | . | . | 1 | 1 | . | . |
| Ecology, evolutionary biology, and epidemiology | 2 | 2 | 4 | 4 | 6 | 4 | 1 | 6 | 2 | 9 |
| Genetics and genomics | 7 | 14 | 1 | 9 | 6 | 5 | 5 | 5 | 5 | 4 |
| Microbiology and immunology | 3 | 11 | 8 | 7 | 8 | 2 | 10 | 3 | 9 | 3 |
| Molecular biology | 1 | 6 | 5 | 1 | 4 | 5 | . | 1 | 4 | 1 |
| Neurobiology and neurosciences | 2 | 3 | 4 | . | . | 2 | 2 | 1 | 3 | . |
| Pharmacology and toxicology | 1 | 1 | 3 | 3 | 1 | 4 | 4 | 2 | 3 | 2 |
| Physiology, pathology, and cancer biology | 1 | 1 | . | 1 | . | 4 | 2 | 2 | 1 | 1 |
| Biology and biomedical sciences, other | 10 | 6 | 14 | 13 | 13 | 19 | 14 | 7 | 13 | 18 |
| Computer and information sciences | 17 | 22 | 16 | 15 | 8 | 12 | 14 | 13 | 12 | 5 |
| Computer science | 15 | 20 | 16 | 14 | 6 | 11 | 10 | 7 | 9 | 3 |
| Computer and information sciences, other | 2 | 2 | . | 1 | 2 | 1 | 4 | 6 | 3 | 2 |
| Engineering | 95 | 119 | 117 | 96 | 141 | 126 | 123 | 100 | 96 | 81 |
| Aerospace, aeronautical, and astronautical engineering | 10 | 5 | 6 | 5 | 8 | 8 | 10 | 10 | 8 | 6 |
| Bioengineering and biomedical engineering | 1 | 2 | 1 | 4 | . | 1 | 1 | 1 | 1 | 3 |
| Chemical and petroleum engineering | 2 | 14 | 11 | 10 | 11 | 11 | 8 | 6 | 5 | 10 |
| Civil, environmental, and transportation engineering | 20 | 17 | 17 | 15 | 25 | 29 | 21 | 12 | 14 | 10 |
| Electrical and computer engineering | 20 | 24 | 27 | 18 | 37 | 24 | 29 | 29 | 30 | 21 |
| Industrial engineering and operations research | 6 | 14 | 13 | 5 | 6 | 5 | 9 | 7 | 3 | 4 |
| Materials and mining engineering | 10 | 9 | 13 | 6 | 7 | 11 | 10 | 5 | 13 | 8 |
| Mechanical engineering | 19 | 19 | 16 | 22 | 29 | 21 | 23 | 18 | 12 | 12 |
| Engineering, other | 7 | 15 | 13 | 11 | 18 | 16 | 12 | 12 | 10 | 7 |
| Geosciences, atmospheric, and ocean sciences | 4 | 4 | 2 | 2 | 2 | 8 | 4 | 3 | 3 | 1 |
| Geological sciences | 2 | 1 | 2 | 2 | 1 | 2 | 2 | . | 1 | 1 |
| Ocean, marine, and atmospheric sciences | 2 | 3 | . | . | 1 | 6 | 2 | 3 | 2 | . |
| Health sciences | 3 | 2 | . | 3 | 6 | 2 | 3 | 3 | 4 | 1 |
| Public health | 1 | . | . | . | . | . | 1 | . | . | . |
| Health sciences, other | 2 | 2 | . | 3 | 6 | 2 | 2 | 3 | 4 | 1 |
| Mathematics and statistics | 30 | 30 | 31 | 28 | 28 | 28 | 32 | 26 | 15 | 21 |
| Applied mathematics | 4 | 4 | 5 | 3 | 3 | 4 | 5 | 1 | 4 | 3 |
| Mathematics | 1 | 1 | 1 | 1 | . | 4 | . | 3 | 1 | 1 |
| Statistics | 18 | 18 | 17 | 11 | 12 | 13 | 18 | 13 | 6 | 10 |
| Mathematics and statistics, other | 7 | 7 | 8 | 13 | 13 | 7 | 9 | 9 | 4 | 7 |
| Physical sciences | 27 | 38 | 40 | 23 | 41 | 35 | 30 | 36 | 25 | 56 |
| Astronomy and astrophysics | . | 1 | 2 | . | 2 | 1 | 1 | 1 | 1 | 2 |
| Chemistry | 18 | 29 | 25 | 15 | 28 | 25 | 19 | 22 | 17 | 40 |
| Physics | 9 | 8 | 13 | 8 | 11 | 9 | 10 | 13 | 7 | 14 |
| Psychology | 14 | 18 | 15 | 22 | 20 | 18 | 17 | 17 | 13 | 11 |
| Clinical psychology | . | . | 1 | 1 | . | 1 | . | . | 2 | . |
| Counseling and applied psychology | 4 | 4 | 2 | 6 | 4 | 3 | 2 | 2 | 1 | 3 |
| Research and experimental psychology | 4 | 3 | 5 | 6 | 8 | 5 | 3 | 5 | 3 | 5 |
| Psychology, other | 6 | 11 | 7 | 9 | 8 | 9 | 12 | 10 | 7 | 3 |
| Social sciences | 19 | 18 | 17 | 19 | 26 | 15 | 14 | 16 | 30 | 16 |
| Anthropology | 1 | . | 1 | . | . | . | . | . | . | 1 |
| Economics | 9 | 9 | 8 | 10 | 13 | 5 | 9 | 9 | 12 | 7 |
| Sociology, demography, and population studies | 3 | 2 | 3 | 2 | 5 | 4 | 2 | 4 | 4 | 5 |
| Social sciences, other | 6 | 7 | 5 | 7 | 8 | 6 | 3 | 3 | 14 | 3 |
| Non-science and engineering | 42 | 39 | 39 | 32 | 41 | 48 | 65 | 65 | 47 | 50 |
| Business | 14 | 18 | 15 | 10 | 12 | 12 | 13 | 13 | 8 | 13 |
| Business | 14 | 18 | 15 | 10 | 12 | 12 | 13 | 13 | 8 | 13 |
| Education | 15 | 9 | 13 | 17 | 16 | 25 | 38 | 34 | 27 | 28 |
| Education leadership and administration | 1 | . | 1 | 1 | 1 | 4 | 15 | 17 | 9 | 10 |
| Education research | 8 | 4 | 7 | 8 | 6 | 8 | 8 | 7 | 10 | 9 |
| Teacher education and teaching fields | 3 | 2 | 4 | 4 | 4 | 7 | 10 | 5 | 6 | 6 |
| Education, other | 3 | 3 | 1 | 4 | 5 | 6 | 5 | 5 | 2 | 3 |
| Humanities and arts | 5 | 5 | 3 | 1 | 9 | 4 | 10 | 7 | 6 | 5 |
| Letters | 4 | 4 | 3 | 1 | 4 | 3 | 8 | 4 | 2 | 5 |
| History | 1 | . | . | . | 5 | 1 | 2 | 2 | 2 | . |
| Humanities and arts, other | . | 1 | . | . | . | . | . | 1 | 2 | . |
| Other non-science and engineering | 8 | 7 | 8 | 4 | 4 | 7 | 4 | 11 | 6 | 4 |
| Communication | . | 1 | . | . | . | 1 | . | 1 | 1 | . |
| Public administration and social services | . | . | 1 | . | . | . | . | . | . | . |
| Non-science and engineering, other | 8 | 6 | 7 | 4 | 4 | 6 | 4 | 10 | 5 | 4 |
NOTES:
- . = data were not collected at this level or institution was not eligible to participate for this survey year.
SOURCE: National Center for Science and Engineering Statistics, Survey of Earned Doctorates
