54 BULLETIN 1400, U. S. DEPARTMENT OF AGRICULTURE 
Table 4t. — Net relation of the percentage of farm tillable to the farm value per acre 
Proportion of farm area tillable, 
in per cent 
Deviation from 
average value 
per acre, other 
factors being 
the same 
Proportion of farm area tillable, 
in per cent 
Deviation from 
average value 
per acre, other 
factors being 
the same 
30 
Dollars 
-0.2 
-.2 
-1.3 
-2.5 
-3.8 
! 80 
Dollars 
-2.0 
40... 
85 
+3.5 
50.. 
90 
+10.7 
60 
95 
+19.8 
70. 
100.. 
+28.9 
Table 48. — Net relation of the distance to town to the farm value per acre 
Distance to town, in miles 
Deviation of 
farm value 
from average 
per acre, other 
factors remain- 
ing unchanged 
Distance to town, in miles 
Deviation of 
farm value 
from average 
per acre, other 
factors remain- 
ing unchanged 

Dollars 
+8.1 
+5.2 
+.4 
3 
Dollars 
-4.4 
1... 
4 
-11.7 
2. 
5 
-13.2 
FACTORS AFFECTING EARNINGS ON ALL FARMS 
The initial correlation analysis with earnings as the dependent 
was made in connection with the study of the differences in the 
organization of the different farms, to determine (1) the relative 
importance of differences in the different enterprises in affecting 
operator's earnings, (2) the average effect of changes in the proportion 
of the different enterprises upon operator's earnings. 
Since it was evident that size of farm and efficiency of operation 
also affected operator's earnings, factors to measure them were 
included in the correlation analysis, to eliminate their effects in 
measuring the other relations. 
All farms except those that reported mushrooms, and a few which 
were discarded as unusable for reasons mentioned previously, were 
included, giving 357 observations for the correlation study. The 
factors taken into account were as follows: 
Size factors: 
A. Number of cows. 
B. Acres in crops. 
C. Acres in pasture. 
Efficiency factors: 
D. Crop index. 
E. Labor index. 
F. Percentage of dairy feed purchased. 
Organization factors, dollars of receipts from: 
G. Crops. 
H. Dairy products or cattle. 
I. Beef Cattle, 
k. Hogs. 
L. Sheep. 
M. Poultry. 
Dependent factor: 
O. Operator's earnings. 
The 12 factors gave a multiple correlation with operator's earnings 
of R = 0.843. 
