A Comparison of Two Log Grading Systems

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A Comparison of Two Log Grading Systems
C S Charles S Walters
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As shown in Table 6, the average actual lumber value for all logs was $16. 10 0. 69. The average value predicted from FPL grade yield percentages was $15. 74 0. 70. With the Purdue grading system, a mean value of $17. 25 0. 74 was predicted from grade yields, and $15. 52 0. 65 from quality indexes. Thus, although all three systems gave good estimates, the FPL system was most accurate, with the difference between mean actual value and mean predicted value being just 36 cents. This difference was... not statistically signifi- cant at the . 05 level of probability (Table 7). The difference of 58 cents between actual value and the value predicted by the Purdue quality indexes was statistically significant, however, as was the dif- ference of $1. 15 between actual value and the value predicted by Pur- due grade yields.
Table 7. Relation of Actual Value to the Predicted Values Predicted value from Correlation coefficient Difference of means Standard error of the difference I" FPL grade yields .


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