292 



HARRIS, KIRKPATRICK, BLAKESLEE, WARNER AND CARD 



The errors, shown in table 3, range from 23.2 to 28.1 eggs or from 14, 

 to 17.8 percent. 



Similar results for the square root of mean square deviation are give 

 in table 4 which shows that prediction from the sum of two-consecutivi 



Id 12 /4 18 18 20 II 24 IS 28 30 32 34 3i 38 4J 42 44 46 48 SO i? 54 SI 



DIAGRAM 6. Tests of prediction of annual production from the combined record of tv 

 consecutive months. Tests of February-to-May production. 



months production gives a square root of mean square deviation rangir 

 from 30.4 to 36.5 eggs or from 19.3 to 23.1 percent of the annual productic 

 Thus it is clear that the annual egg record of a bird may be predict 

 with a high degree of accuracy from the combined egg record of any 

 consecutive months. 



