| タイトル | Missing observations in multiyear rotation sampling designs |
| 本文（外部サイト） | http://hdl.handle.net/2060/19830004235 |
| 著者（英） | Gbur, E. E.; Sielken, R. L., Jr. |
| 著者所属（英） | Texas A&M Univ. |
| 発行日 | 1982-06-01 |
| 言語 | eng |
| 内容記述 | Because Multiyear estimation of at-harvest stratum crop proportions is more efficient than single year estimation, the behavior of multiyear estimators in the presence of missing acquisitions was studied. Only the (worst) case when a segment proportion cannot be estimated for the entire year is considered. The effect of these missing segments on the variance of the at-harvest stratum crop proportion estimator is considered when missing segments are not replaced, and when missing segments are replaced by segments not sampled in previous years. The principle recommendations are to replace missing segments according to some specified strategy, and to use a sequential procedure for selecting a sampling design; i.e., choose an optimal two year design and then, based on the observed two year design after segment losses have been taken into account, choose the best possible three year design having the observed two year parent design. |
| NASA分類 | EARTH RESOURCES AND REMOTE SENSING |
| レポートNO | 83N12505
E83-10022
IT-T2-04323
NASA-CR-167700 |
| 権利 | No Copyright |
|
