PER UNIT COSTS TO OWN AND OPERATE FARM MACHINERY

Table 2. Estimated Coefficients for the Four Different Models (Continued)._________________

Variable

Units

Model 1
(Linear)^a

Model 2
(Quadratic)^a

Model 3
(Reciprocal/

Model 4
(Logarithmic/

KAS^b

lsb

$/bale

12.07

12.07

12.08

12.08

11.70

ssb

$/bale

0.532

0.533

0.533

0.533

0.535

cs

$/ton

3.07

3.07

3.07

3.07

3.09

rm

$/acre

7.83

7.84

7.83

7.84

7.90

fpm

$/mile

0.336

0.341

0.336

0.341

0.345

gsm

$/mile

1.79

1.84

1.80

1.84

2.07

fertilizer

percent

112.5

112.6

112.4

112.6

113.4

fcwf

$/acre

6.30

6.37

6.24

6.41

6.72

swf

$/acre

6.09

6.11

6.06

6.12

6.10

dntwf

$/acre

11.35

11.34

11.28

11.39

11.22

drtwf

$/acre

6.67

6.75

6.61

6.75

7.36

pntwf

$/acre

11.14

11.40

11.00

11.20

11.37

prtwf

$/acre

9.17

9.25

9.11

9.25

9.11

Scale Factors

constant

--

1.364

1.452

1.241

1.792

--

ha

--

-6.2×10^-5

-2.1×10^-4

--

--

--

ha²

--

--

4.3×10^-8

--

--

--

1/ha

--

--

--

33.027

--

--

ln(ha)

--

--

--

--

-0.076

--

In-sample Statistics

CC^c

--

0.871

0.871

0.874

0.872

--

RMSE^d

--

27,648

27,688

27,598

27,607

--

Model 1

_______(Linear/

Model 2
(Quadratic/

Model 3
(Reciprocal/

Model 4
(Logari thmic)^a

CC^c

0.864

0.858

0.869

0.865

RMSE^d_____

________28,368

29,021

28,205

28,353