Difference between revisions of "Sample design"
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*'''When a satisfying stratification of the domain(s) has been obtained, the total number of sample stands are decided''' | *'''When a satisfying stratification of the domain(s) has been obtained, the total number of sample stands are decided''' | ||
| − | This is called the sample size-definition part. First, a defined number of sample stands will be allocated to each stratum (e.g., proportional to the volume). You could and probably should re-distribute the sample stands over the different strata, with a higher sampling intensity in strata with more valuable forests and where forest management decisions are supposed to be more difficult. The term and parameter "Representative Area", with a value calculated as ''Productive forest land area in current stratum/Sample size (number of sampled stands) in current stratum'', might be found a bit confusing. ''A scale factor with a unit (hectares)? With the same value for all sampled stands in a stratum (despite they probably will have different areas)?'' Don't worry, as long as the sampling of stands is done PPS, and size is | + | (nothing more, nothing less). |
''NB: There should be at least three sample stands in each stratum. Moreover, aviod extreme differences in the representative area of different strata.'' | ''NB: There should be at least three sample stands in each stratum. Moreover, aviod extreme differences in the representative area of different strata.'' | ||