Growth 



For the area sampled, standard errors of net annual growth are: 



Growing stock Live sa wtir.ber 



Million cubic feet Percent Million board feet Percent 



All species + 33 ± 11.7 +152 +15.6 



Commodity Drain 



Estimates of commodity drain are based chiefly on a complete tabula- 

 tion of production and consumption statistics, adjusted for waste on 

 the basis of woods and mill studies. Only 23 percent of the cubic- 

 foot and 21 percent of the board-foot drain are based on sampling. 

 However, the translation of production statistics into drain intro- 

 duces an indeterminable error. 



The average annual commodity drain estimates for North Idaho are judged 

 to lie between the following limits: 



All species Growing stock 123-139 million cubic feet 

 Live sawtimber 777-841 million board feet 



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