vPPENDIX ADEQUACY OF DATA 



663 



'able 84. — Sampling errors ^ of estimates of private commercial forest land, number of private ownerships, 

 operating area, and area by productivity class, by size class of ownership, section, and region. United 

 States and Coastal Alaska — Contmiied 



MEDIUM AND LARGE OWNERSHIPS (5,000 ACRES AND LARGER) 



Section and region 



Commer- 

 cial forest 



land 



area 



Number 

 of private 

 owner- 

 ships 2 



Operating 

 area 



Productivity class ' 





Upper 



Medium 



Lower 



Xorth: 



New England 



Percent 

 0.5 



1. 4 

 . 5 



2. 4 

 



Percent 

 

 

 

 

 



Percent 

 2. 1 

 6.4 

 2. 7 

 6.9 

 



Percent 



1. 3 



7. 6 



2. 5 



8. 4 

 



Percent 

 6.7 



10. 4 



11. 1 

 11. 4 







Percent 

 7 1 



'Middle Atlantic- _ .._ . ._. . . 



33 3 



Lake States _ _ . 



8 9 



Central States . . _ . 



22 3 



Plains -__ . . _. 











All regions 



.5 







1. 9 



1.6 



4.7 



21. 1 



21.4 



5. 5 



21 5 







routh: 



South Atlantic . ___ . _____ 



1. 7 



1.7 



. 6 





 

 



4.0 

 5.3 

 2. 6 



3. 8 



4. 8 

 2. 5 



23. 7 

 12 9 



Southeast 



West Gulf . _ 







All regions 



. 9 







2. 9 



2.7 



10. 



15. 1 



West: 



Pacific Northwe.st 



1. 5 



2.8 







7.3 





 

 

 



3.2 



6.4 











2. 8 



6. 4 











17.0 



24. 4 











42 



California _ _____ _._ 







Northern Rocky Mountain _ _ _ 







Southern Rocky Mountain 







All regions 



1.2 







2. 1 



2. 2 



5. 9 



16 3 







\11 sections, United States __ _ _____ 



. 6 

 





 



1. 9 

 



1. 9 

 



5.0 

 



11 7 



Coastal Alaska 











'Jnited States and Coastal Alaska _ 



.6 







1. 9 



1.9 



5.0 



11. 7 







ALL PRIVATE OWNERSHIPS 



.\ortli: 



New England 



Middle Atlantic 



Lake States _ _ _ 



2. 1 

 5.2 

 4. 5 

 4. 1 

 15. 9 





2.9 

 8.4 

 6. 

 8.7 

 43. 1 



2. 4 

 10. 3 



7. 2 

 12. 2 



0) 



6.6 

 10. 5 

 13.2 

 13. 7 



0) 



18. 1 

 37. 1 

 17 3 



Central States _ 



26. 2 



Plains 



38.0 



All regions 



2. 1 





3.2 



3. 9 



5. 2 



14. 7 



South: 



South Atlantic 



Southeast 



West Gulf 



4.7 

 2. 5 

 5. 1 





6.3 

 4.6 



4. 4 



7.8 

 5.6 

 5.3 



12. 6 

 10. 6 



7.7 



19. 5 

 10. 4 

 12 5 







All region.s 



2.2 





3.0 



3.7 



6. 2 



7.7 



West: 



Pacific Northwest 



1.8 

 4.2 

 5. 3 



7. 4 





2. 9 

 6. 2 

 3.6 

 9. 8 



2. 9 



6.7 



2.3 



13. 5 



8. 1 

 16.9 



6.7 

 18.7 



17 4 



California 



Northern Rocky Mountain 



Southern Rocky Mountain 





30. 

 10.2 



4.7 



All regions 



1.8 





2.2 



2.5 



5. 1 



9 7 







All sections, United States __ 



1. 4 

 





2. 

 



2.7 

 



3.6 

 



5. 9 



Coastal Alaska 









United States and Coastal Alaska 



1. 4 





2. 



2.7 



3. 6 



5. 9 







• Sampling error in terms of one standard error. 



' No sampling error for ownerships of 5,000 acres and 

 >ore because complete ownership lists were available and 

 .lerefore sampling error was nil. 

 '" Large sampling errors frequently apply to a small 



aa or percentage in the productivity class. Sampling 



error of 40 percent applicable to 5 percent of operating 

 area indicated in low productivity, for example, indicates 

 range of ± (5 x .40)= ±2. The odds are 2 to 1 that the 

 true percentage in the class would therefore fall in the 

 range 3 to 7 percent. 



^ Estimates too crude for use on a State basis. 



/ 



439296 0—58- 



-43 



