Multiple Correlations 



Several very interesting nmltiple correlation relationships were 

 found o 



Factors Determining Specific Gravity 



The data in table 2 confirm the conclusions stated in the section on 

 Specific Gravity on page 27 of the Research Report, that specific gravity 

 is affected by fat content and total ash. Total ash was positively cor- 

 related and fat negatively correlated to the specific gravity to an extent 

 that the combined value for R " ,93, or R^ accounted for 86 percent of the 

 variability. This value is high enough that formulas could be derived 

 predicting the third value based on any other two, if any practical purpose 

 was to be gained by such calculations. 



Factors Affecting Total Dry Solids 



The conclusion reached from inspection of figure 13 and stated on 

 page 2k of the Research Report, namely that there was little correlation 

 between the dry solids content and either the specific gravity or refrac- 

 tive index, was also confirmed by the statistical analysis, table 3« 

 There was no significant simple correlation of either one to the dry- 

 solids content, and the combination gave no appreciable improvement. The 

 R^ value was only lit percent. 



Factors Affecting Viscosity 



The next study was suggested in the hope that differences in composition 

 might explain the very great range in viscosity of the condensed solubles 

 that had been observed in the samples tested. The conclusion reached fix)m 

 the data in table h was that none of the variables tested, that is, dry 

 solids, ammonia, fat, total ash, or water insoluble matter, either indi- 

 vidually or collectively could be significantly associated with variability 

 in viscosity. 



Factors Affecting Moisture Absorption 



In a similar manner, four variables were selected for study to determine 

 their effect on the moisture absorption of the dry solubles. The data in 

 table 5 show that individually, none of them, ammonia, corrected protein, 

 fat, or total ash had a significant simple correlation coefficient, but it 

 was suggested that the improvement considering all variables is quite good. 

 The mxiltiple correlation just lacked significance at the 5-percent level, 

 and consequently, it is not of great practical value in predicting the 

 probability that a given sanqjle of condensed solubles would yield dry 

 solubles having low moisture absorption. 



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