SURVEY PROCEDURES 



The survey of saw log receipts at sawmills was based on a list of mills prepared in the 

 latter part of 1962. That list was made as complete as possible through reviews by Forest 

 Service personnel. All listed mills were contacted by mail early in 1963 to obtain data on their 

 saw log receipts for 1962. All mills outside the three States that were considered possible 

 recipients of logs from Colorado, Wyoming, or western South Dakota were also asked to report. 

 Field sampling provided data for estimating, within acceptable error limits, the receipts of 

 sawmill operators who did not furnish mail reports (nonrespondents). 



The estimated total saw log receipts and the standard errors for those parts of the total 

 receipts for Colorado, Wyoming, and western South Dakota that were estimated by field 

 sampling nonrespondents were: 



Colorado 

 Wyoming 



Western South Dakota 



Estimated total 

 receipts 

 (M bd. ft.) 



184,645 

 116,523 

 38,958 



Standard 

 error 

 (M bd. ft.) 



±2,878 

 ±4,149 

 ±775 



Standard error 

 as percent of 

 total 



1.56 

 3.56 

 1.99 



The odds are 2 to 1 that the true totals for the States are within the estimate 

 ± the standard error. 



Similar procedures were used in the survey of round timbers received at mines in Colo- 

 rado and Wyoming during 1962. Lists of mines were compiled from a mining industry 

 directory •'•^ and nonrespondents were sampled by field contacts. The standard error of the 

 estimated portion of round mine timber receipts from Colorado timberlands was 164 cubic feet, 

 or 0.01 percent of the State total. Therefore, the odds are 2 to 1 that the actual State total is 

 1,410,677 ± 164 cubic feet. For round mine timber receipts from Wyoming, the standard error 

 for the estimated portion was 1,125 cubic feet, or 2.09 percent of the State total. Again, at 2 

 to 1 odds, the true Wyoming total lies in the range 53,845 ±1,125 cubic feet. No use of round 

 mine timbers in 1962 was reported for western South Dakota because none of the respondents or 

 field-sampled nonrespondents indicated any use of this product. 



Reports were obtained by mail and field contacts made with all plants known to have 

 received round pulpwood, commercial poles, and miscellaneous industrial wood from Colorado, 

 Wyoming, and western South Dakota in 1962; in addition, the National Forests on which these 

 products were harvested also reported. Accordingly, all these estimates are considered to be 

 without sampling error . 



Estimates of the 1962 production of posts, fuelwood, and miscellaneous farm timbers for 

 all three States were obtained from reports furnished by National Forests, State Foresters, 

 Bureau of Land Management, Bureau of Reclamation, and the Bureau of Indian Affairs, and 

 supplemented by trend estimates of farm use of these products obtained from the Bureau of the 

 Census Since this procedure precluded the calculation of a sampling error, none has been 

 assigned. 



Mining World Catalog, Survey and Directory Number, 1962, Miller Freeman Publications. 

 Census Bureau: 1959 Census of Agriculture, vol. II, General Report. 



DPSU/ 1 496- 1 3 



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