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| 1 | Comparison of estimators of variance for forest inventories with systematic sampling-results from artificial populations显示文摘Background:Large area forest inventories often use regular grids(with a single random start)of sample locations to ensure a uniform sampling intensity across the space of the surveyed populations.A design-unbiased estimator of variance does not exist for this design.Oftentimes,a quasi-default estimator applicable to simple random sampling(SRS)is used,even if it carries with it the likely risk of overestimating the variance by a practically important margin.To better exploit the precision of systematic sampling we assess the performance of five estimators of variance,including the quasi default.In this study,simulated systematic sampling was applied to artificial populations with contrasting covariance structures and with or without linear trends.We compared the results obtained with the SRS,Matern’s,successive difference replication,Ripley’s,and D’Orazio’s variance estimators.Results:The variances obtained with the four alternatives to the SRS estimator of variance were strongly correlated,and in all study settings consistently closer to the target design variance than the estimator for SRS.The latter always produced the greatest overestimation.In populations with a near zero spatial autocorrelation,all estimators,performed equally,and delivered estimates close to the actual design variance.Conclusion:Without a linear trend,the SDR and DOR estimators were best with variance estimates more narrowly distributed around the benchmark;yet in terms of the least average absolute deviation,Matern’s estimator held a narrow lead.With a strong or moderate linear trend,Matern’s estimator is choice.In large populations,and a low sampling intensity,the performance of the investigated estimators becomes more similar. | Steen Magnussen Ronald EMcRoberts Johannes Breidenbach Thomas Nord-Larsen Göran Ståhl Lutz Fehrmann Sebastian Schnell | 2020 | Forest Ecosystems2020，7，2： | 2 |
| 2 | Therapeutic guidelines for the treatment of bone metastasis: a report from the American College of Radiology Appropriateness Criteria Expert Panel on Radiation Oncology 显示文摘 | Janjan N Lutz ST Bedwinek JM | 2009 | J Palliat Med2009，12，5： | 1 |
| 3 | Plasma levels of macrophage migration inhibitory factor are elevated in patients with severe sepsis显示文摘 | Lutz Lehmann Uwe Novender Stefan Schroeder Torsten Pietsch Tilman von Spiegel Christian Putensen Andreas Hoeft Frank Stüber | 2001 | Intensive Care Medicine2001，，8： | 1 |
| 4 | A Review of hypofractionated palliative radiotherapy显示文摘 | Lutz ST Chow EL Hartsell WF | | 0，，： | 1 |
| 5 | Results of high dose thoracic irradiation incorporating beam's eye view display in non-small cell lung cancer: a retrospective analysis显示文摘 | Huauka MB Turrisi AT Lutz ST | 1993 | Int J Radiat Oncol Biol Phys1993，27，： | 1 |
| 6 | Results of high-dose thoracic irradiation incorporating beam,s eye view display in non-small cell lung cancer: a retrospective multivariate analysis显示文摘 | Hazuka MB Turrisi AT Lutz ST | 1993 | Int J Radiat Oncol Biol Phys1993，27，2： | 1 |
| 7 | Cognitive development in benign focal epilepsies of childhood 显示文摘 | Metz - Lutz MN Kleitz C de St - Martin A | 1999 | Dev Neurosci1999，21，35： | 1 |
| 8 | ACR appropriateness criteria spinal bone metastases 显示文摘 | LOSS LUTZ ST CHANG EL | 2013 | J Palliat Med2013，16，1： | 1 |
| 9 | A multiplex real-time PCR assay for rapid detection and differentiation of 25 bacterial and fungal pathogens from whole blood samples显示文摘 | Lutz Eric Lehmann Klaus-Peter Hunfeld Thomas Emrich Gerd Haberhausen Heimo Wissing Andreas Hoeft Frank Stüber | 2008 | Medical Microbiology and Immunology2008，，3： | 1 |
| 10 | Result of high-dose thoracic irradiation incorporting beam,seye view display in non-small cell lung cancer:a retrospective multivariate analysis显示文摘 | Huzaka MB Turrisi AT Lutz ST | 1993 | Int J Radiat Oncol Biolphys1993，27，： | 1 |
| 11 | ACR Appropriateness Criteria spinal bone metastases显示文摘 | Expert Panel on Radiation Oncology-Bone Metastases Lo SS Lutz ST | 2013 | J Palliat Med2013，16，1： | 1 |
| 12 | Result of high-dose thoracic irradiation ineorporting beam,seye view display in nonsmall cell lung cancer:a retrospective multivariate analysis显示文摘 | Huzaka MB Turilai AT Lutz ST | 1993 | Int J Radiat Oncol Biolphys1993，27，3： | 1 |
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