THE CORRELATIONS OF AREAS OF MATURED CROP AND THE RAINFALL. 359 



4> k = the regression coefficient for the regression of crop on rain divided by the mean 



area of the matured crop, viz. 



°r C» 



The same symbols are used for the corresponding quantities for the Rabi 

 (spring) harvest, except that the suffix V is substituted for '*' wherever the latter 

 occurs, and the period to which the rainfall data apply being from October to 

 March, both inclusive. 



The following tables give the values of these coefficients for the 30 villages 

 selected in each of the 4 Tahsils : Raya, Pasrur, Sialkot and Zafarwal. 



For the calculation of the coefficients for the rainfall the figures have been taken 

 to the nearest ■£$ *, and for the areas of the crops to the nearest 10 acres. 



Table I — Kharif (Autumn) harvest. 



R 



°R 



V R C ,< 



<r c vc 



Place. 

 Raya 

 Pasrur 

 Sialkot 

 Zafarwal 



1971 + 1-13 



7*465+ *8o 



37-88 



2964 + 130 



863+ 92 



29*10 



•4608 + -119 



•0l8 



21*13+1-06 



7'043± 75 



33 - 32 



4290 + 1821 



1209 + 129 



28*18 



•2967 + -137 



•015 



24-01 + 1-36 



8*979+ '96 



37HI 



4576 + 156 



1036 + no 



22-64 



-4639 + ' 118 



•012 



25*80 + 1*45 



9*698 + 1*03 



37-58 



4030 + 112 



743+ 79 



18-44 



•4402 + -122 



•O084 



Table II — Rabi (Spring) harvest. 



R 



*R 



V R 



C 



°C 



V C 



5-49 + -51 



3-35 ±'36 



6i*oo 



5025 + 291 



1929 + 206 



38-42 



•5885 + -097 



.■068 



6*90 ±*66 



4-30 + *46 



63*12 



6900 + 394 



2613 + 279 



37-88 



*46i3 + *ii9 



•040 



7*30 + -63 



4*i8±*45 



57'29 



3208 + 264 



1754 + 187 



54-67 



•7335 + -070 



•096 



7'73 + '69 



4 - 57 + - 49 



59-i8 



4860 + 229 



2151 + 219 



44*26 



•7207 + '072 



•070 



Place. 

 Raya 

 Pasrur 

 Sialkot 

 Zafarwal 



The places considered are entered in each table in ascending order of their mean 

 rainfalls. 



Before dealing with the correlations and regressions of each place separately, some 

 general remarks on the facts brought to light by the tables will be made. 



Thus it is remarkable that the coefficients of variation for both rainfall and crop 

 are considerably smaller for the kharif harvest than they are for the Rabi, and 

 that the crop is in both harvests less variable than the rainfall on which it depends. 

 The coefficient of variation of the rainfall of April to September might be put 

 roughly at about 37, and for the months October to March at about 60, the divergences 



