Synergies or trade-offs in university life sciences
research.
by Foltz, Jeremy D.^Barham, Bradford L.^Kim, Kwansoo
American Journal of Agricultural Economics • May, 2007 • increasing returns (scale and scope economies) in the
production of three major life science research outputs: patents,
articles, and doctorates analyzed
(0.00385) *** (0.004) ***
PhDs (2) -0.7119 -0.7324659
(0.378) * (0.439) *
Patent x article -0.2466 -0.262
(0.1859) (0.209)
Patent x PhDs 3.8405 3.927
(1.551) ** (1.858) **
Article x PhDs 0.1973 0.203
(0.0727) *** (0.087) **
Staff wage 675.956 522.317
(547.786) (465.615)
Faculty salary 1,016.739 965.133
(305.436) *** (307.506) ***
Staff wage (2) 16.482 20.141
(12.1831) (10.296) **
Faculty salary (2) -6.6961 -5.894
(3.3393) ** (3.127) *
Staff wage x faculty
salary -23.053 -24.513
(13.686) * (13.823) *
No. of undergrads/no.
of faculty 25.996 35.785
(44.757) (25.771)
LGU 12,296.82
(2,464.) ***
Extension employees 3.632
(5.163)
Med school 1,702.204
(1,768.846)
Tech transfer office 1,706.26 1,578.708
(407.23) *** (354.823) ***
Tech transfer office
in 80 -1,578.353
(1,988.541)
Constant -26, 156.36 -30,524.15
(9,051.19) *** (8,760.527) ***
Observations
(university) 1,563 (87) 1,563 (87)
[R.sup.2] 0.6655 0.7758
Hausman test Ho: FE coef. = [chi square] (13) =
([dagger]) RE coef. 10.32
Breusch and Pagan [chi square] (1) =
test Ho: [v.sub.i] = 0 6,315.00 ***
Heteroskedasticity
test Ho: Var([e.sub.i]) =
Var([e.sub.it]) t-test = -0.0437
Ho: Var([e.sub.t]) =
Var([e.sub.it]) t-test = -0.1538
Standard errors in parentheses.
Note: *, **, and *** indicate significance at 10%, 5%, and 1%,
respectively.
([dagger]) Hausman test uses the fixed effect set of variables
for comparison.
Table 3. Life Science Cost Function: Citation-Adjusted Outputs
Fixed Effect Random Effect
Patents 124.721 113.538
(80.012) (88.294)
Articles 24.121 27.491
(2.708) *** (2.530) ***
PhDs 40.709 65.599
(28.591) (28.827) **
Patent (2) -3.463 -3.255
(0.951) *** (1.631) **
Articles (2) -0.00663 -0.00682
(0.00156) *** (0.00194) ***
PhDs (2) 0.0234 0.0098
(0.259) (0.314)
Patent x article -0.103 -0.116
(0.090) (0.092)
Patent x PhDs 2.346 2.372
(0.993) ** (1.341) **
Article x PhDs 0.0407 0.0315
(0.0440) (0.0531)
Staff wage 502.133 406.553
(578.330) (494.727)
Faculty salary 1,316.031 1,320.444
(321.422) *** (319.710) ***
Staff wage (2) 14.821 19.184
(12.677) (10.727) *
Faculty salary (2) -8.669 -8.024
(3.524) ** (3.452) **
Staff wage x faculty
salary -18.323 -22.812
(14.462) (14.464)
No. of undergrads/no.
of faculty -8.379 42.678
(46.456) (26.992)
LGU 17,368.31
(2,562.481) ***
Extension employees 4.965
(5.232)
Med school 3,757.154
(1,763.537) *
Tech transfer office 2,295.592 2,148.945
(421.554) *** (368.781) ***
Tech transfer office
in 80 -1,175.084
(2,000.473)
Constant -27,099.64 -37,501.6
(9,604.66) *** (9,174.74) ***
Observations
(university) 1,563 (87) 1,563 (87)
[R.sup.2] 0.4762 0.7416
Hausman test Ho: FE coef. = [chi square] (13) =
([double dagger]) RE coef. 39.12 ***
Breusch and Pagan Ho: [v.sub.i] = 0 [chi square] (1) =
test 5,658.74 ***
Heteroskedasticity Ho: Var([e.sub.i]) =
test Var([e.sub.it]) t-test = -0.0657
Ho: Var([e.sub.t]) =
Var([e.sub.it]) t-test = -0.1984
Standard errors in parentheses.
Note: *. **, and *** indicate significance at 10%, 5%, and 1%,
respectively.
([dagger]) Hausman test uses the fixed effect set of variables for
comparison.
Table 4. Scale and Scope Estimates Measured at
Independent Variable Means
Fixed Random
Effects Effects
Quantity
Scale 1.357 *** 1.240 ***
[Scope.sup.++] 0.021 -0.046
Citation Adjusted
Scale 2.110 *** 1.770 ***
Scope++ 0.489 *** 0.382 ***
([double dagger]) Scope defined as comparing patent production
only and article/doctorate production to producing all three.
*, **, and *** indicate significance at 10%, 5%, and 1%,
respectively.
Table 5. Median Estimates of Scale and Scope by University
Type (Random Effects Model)
Quantity Quality
University Type Scale Scope Scale Scope
Small nonland grant 1.074 0.036 1.494 0.434
Large nonland grant 1.056 0.069 1.420 0.178
Small land grant 1.806 0.401 2.787 0.807
Large land grant 1.612 0.297 2.330 0.542
Overall sample 1.385 0.198 1.860 0.482
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