130
Table 13. Annual Rates of Growth of Crop and Livestock
Production, Mexico; 1935-19'0
Periods Crops Livestock
1935-1940 2.97 1.68
1941-1958 6.76 3.94
1959-1964 4.32 3.76
1935-1964 5.51 3.43
1959-1970b 3.92 3.20
aComputed by regression by use of the following equation
for the 1935-1964 period:
Y = a + b1X1 + b2X2
where Y = annual rate of growth.
a = intercept mean rate of growth for 1935-1940.
1 = coefficient of X = difference in rate of growth
between 1934-1946 and the 1941-1958 periods.
X = dummy variable, 1 for 1941-195, O for the other years.
b2 = coefficient of X2 = difference in rate of growth
between 1934-1940 and the 1959-1964 periods.
X2 = dummy variable, 1 for 1959-1964, 0 for the other
years.
The results of the equations were:
Crops = 2.97 + 3.79X1+ 1.35X2 R2 0.06
(2.65) (3.06) (3.75)
Livestock = 1.68 + 2.26X + 2.0o8X2 = 0.10
(1.13) (1.30) (1.60)
None of the b coefficients was significantly different from zero, t=0.05.
bRates of growth for period 1959-1970 were computed from a different source of data than for the 1935-1964 period. Sources: Tables 14, 20 and 30.