780 



MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



[Vol. XV. 



Table 324. — Correlations between examination alpha and reported schooling. 



Camp. 



Cody (alpha group) 



Do 



Do 



Hancock (alpha group) . 



Do 



Hancock (alpha group, two 

 previous groups combined). 



Sixteen camps (alpha group) . 



Do. 

 Do. 

 Do. 

 Do. 



Meade (unselected) 



Nine camps (unselected). 



Group. 



Oklahoma roeru.ts, October Casual 

 Camp. 



Minnesota recruits, October Casual 

 Camp. 



Recruits from Colorado, New Mex- 

 ico, Oklahoma, and Texas. 



Companies A and B, Third Provi- 

 sional Regiment Ordnance Train- 

 ing Camp. 



Company B, Ordnance Supply 

 School. 



Company B, Ordnance Supply 

 School, and Companies A and B, 

 Third Provisional Regiment, Ord- 

 nance Training Camp. 



Principal Hollerith sample, Groups 

 I, II, and III, native bom. 



Same , foreign 



Same, northern negroes 



Same, southern negroes 



Same, officers 



Three hundred and fourth Ammu- 

 nition Train, native-born and 

 foreign men. 



Draft groups, native-born sample, 

 Group X. 



Range. 



Grade IV to college 4; alpha raw, 



to 170. 

 Grade IV to college 4; alpha raw, 



to 185. 

 Grade I to high school 4; alpha 



weighted, to 330. 

 Grade IV to college 4; alpha 



weighted, to 380. 



High school 1 to college 7; alpha 



weighted, 100-380. 

 Grade IV to college 7; alpha 



weighted, to 380. 



None to college 8; alpharaw,0to205. 



None to college 6; alpha raw, Oto 205. 

 None to college 6; alpha raw , to 185. 

 None to college 4; alpha raw, to 105. 

 Grade VIII to college 12: alpha raw, 



to 205. 

 None to college 4: alpha, to 350 



None to college, 4; alpha, to 360. 



Number 

 of cases. 



506 



707 



3,946 



252 



237 

 4S9 



51,620 



4,162 

 2,850 

 1,709 

 12,586 



262 

 653 



0.67 

 .65 

 .60 

 .67 



.26 

 .73 



.53 

 .59 

 .59 

 .25 



.75 



The term "alpha group" in this table indicates, as has been said, that the men considered 

 too illiterate to take alpha had already been eliminated (Cody, basis fourth grade school ; Han- 

 cock, basis ability to read and write fairly, or sixth grade schooling). From the Meade group 

 termed "unselected," no elimination at all had been made; from the unselected group of 653, 

 men of foreign birth had been eliminated. 



It is obvious in looking over these correlations that they vary chiefly with the heterogeneity 

 of the group — the range both of schooling and of alpha scores which is involved. It is for this 

 reason that the coefficient for officer groups is always small. 



The correlation plots of the Hollerith samplings appear in tables 281 to 287; that of the 

 unselected group of 653 men from nine camps in table 325. It will be noted that of the men 

 who fall below the average score in examination alpha (raw 60-64, weighted 120-129 score 

 groups) very few go to college, less than 1 per cent of those below average in the white draft 

 groups (i. e., less than one-half per cent of the total number) and about 1£ per cent of those 

 below average (i. e., three-fourths of 1 per cent of the total number) in the negro draft groups. 

 This fact appears clearly in the plot for the unselected group of 653, where only a single individual 

 (a dental student) of the 348 men who fall below the average alpha score has ever been to college; 

 the same is true without exception of the Hancock group. Moreover, of this 348 who fall below 

 the average alpha score, only 4 were graduated from high school; only 10 others ever attended 

 high school. The theory that native intelligence is one of the most important conditioning 

 factors in continuance in school is certainly borne out by this accumulation of data. 

 Table 325. — Correlation between alpha raiu total and reported schooling. Group X: Native-born draft, nine camps. 



r- +0.75 



