THE CORRELATIONS OF AREAS OF MATURED CROP AND THE RAINFALL. 367 



(6) Rabi. 



The regression equations are : — 



For crop on rain 



C P = 1849-6 7^4-7301 

 For rain on crop 



C P = 9307-1 R f> - 34126. 



Here again the variability of the crop is very great, and +, P has a high value in 

 consequence. The average rainfall being low, this is to be expected to a certain 

 extent, but the differences between the values for this and the other Tahsils can 

 hardly be explained altogether on this basis. 



The distribution of rain and crop with the regression lines is shown in figure 10. 



(it) Pasrur. 



(a) Kharif. 



It is quite useless to give the regression equations for this Tahsil for the Kharif 

 harvest, as the abnormally low value of the coefficient of correlation makes them 

 worthless for the purposes of prediction, and they would merely mislead. Up to the 

 present I have been unable to trace the source of the error, for such it undoubtedly is, 

 which has produced this anomalous value, but I fear that either one or both of the 

 statistical series for crop and rainfall are at fault, though other explanations considered 

 while discussing the 30 selected villages in this Tahsil are not to be overlooked. 



(b) Rabi. 



The regression equations are: — 



For the regression of crop on rain 



C„ = 2142-3 /?p + 26308 

 For the regression of rain on crop 



Cp = 7987-3 R P - 14022. 



The value of t> P appears to be practically the same as for Sialkot and Zafarwal, 

 and both r P and <p,> are greater than they were for the 30 selected villages of this 

 Tahsil, though the differences are scarcely significant. 



From the data given by Captain Dunlop-Smith on p. 42 of the Assessment Report, 

 and assuming approximately that the whole unirrigated cropped area of the Tahsil is 

 distributed in the following proportions in the various circles, namely, Dokande 11, 

 Darp 8, Pasrur 21, Charkhri 4, the percentages of the principal Rabi crops in this 

 Tahsil are roughly as follows : — 



Wheat . . . . 64 



Barley 

 Gram 

 Fodder 

 Others 



15 



7 



2 



12 



Total 



roo 



