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Estimated Productivity Effects
TABLE I
Dependent Variable = Log(Net Sales/Employees)
|
Independent Variables |
1 |
2 |
|
Log(Employees) |
.001 |
.002 |
| |
(.017) |
(.016) |
| |
|
|
|
Log(Employees)*SIC7 |
.194* |
.194* |
| |
(.118) |
(.118) |
| |
|
|
|
Log(Gross Capital/Employees) |
.298*** |
.284*** |
| |
(.063) |
(.061) |
| |
|
|
|
Log(Gross Capital/Employees)* |
.187*** |
.201*** |
|
SIC7 |
(.072) |
(.071) |
| |
|
|
|
Time Trend |
.012 |
.011 |
| |
(.046) |
(.045) |
| |
|
|
|
SIC7 |
-1.16*** |
-1.23*** |
| |
(.367) |
(.376) |
| |
|
|
|
(Net Capital/Gross Capital) |
-.004 |
-.004 |
| |
(.006) |
(.007) |
| |
|
|
|
Drug Testing Dummy |
-.179*** |
|
| |
(.075) |
|
| |
|
|
|
Pre-test Screening Dummy |
-.161** |
|
| |
(.079) |
|
| |
|
|
|
Random Test Dummy |
-.232** |
|
| |
(.111) |
|
| |
|
|
|
Constant |
4.36*** |
4.42*** |
| |
(.299) |
(.309) |
| |
|
|
|
R2 |
.34 |
.34 |
| |
|
|
|
AdjR2 |
.31 |
.31 |
| |
|
|
|
Chi-Square heteroscedasticity (df) |
436.0 (8)*** |
438.4 (9)*** |
| |
|
|
|
N |
206 |
206 |
Significance level for two-tailed test ***=.01, **=.05, *=.10. If the Breusch Pagan Chi-Square test is significant, standard errors are corrected using White's(1980) method.
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