A Comparison of Two Log Grading Systems
A Comparison of Two Log Grading Systems
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In our eReader you can find the full English version of the book. Read A Comparison of Two Log Grading Systems Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book A Comparison of Two Log Grading Systems
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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 .
What to read after A Comparison of Two Log Grading Systems?
You can find similar books in the "Read Also" column, or choose other free books by C S Charles S Walters to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
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 .
What to read after A Comparison of Two Log Grading Systems?
You can find similar books in the "Read Also" column, or choose other free books by C S Charles S Walters to read onlineMoreLess
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