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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 | The hepatitis C virus nonstructural protein 4B is all integral endoplasmic reticulum membrane protein显示文摘 | Hugle T F Fehrmann E Bieck M | 2001 | Virology2001，284，1： | 1 |
| 3 | Evidence based selection of housekeeping genes显示文摘 | de Jonge H J Fehrmann R S de Bont E S Hofstra R M Gerbens F Kamps W A de Vries E G van der Zee A G te Meerman G J ter Elst A | | 0，，： | 1 |
| 4 | Five years' results from a long-term field experiment on carbendazim resistance of Pseudocercosporella herpotrichoides ( Fron ) Deighton 显示文摘 | FEHRMANN H HORSTEN J SIEBRASSE G | 1982 | Crop Protection1982，1，2： | 1 |
| 5 | Evidence based selection of housekeeping genes显示文摘 | De Jonge H J M Fehrmann R S N De Bont E S J M | 2007 | PLoS ONE2007，2，9： | 1 |
| 6 | Vascular endothelial growth factor and its receptor as drug targets in hematological malignancies显示文摘 | Kessler T Fehrmann F Bieker R | 2007 | Curr Drug Targets2007，8，3： | 1 |
| 7 | Human papillomaviruses: targeting differentiating epithelial cells for malignant transformation显示文摘 | Fehrmann F Laimins LA | 2003 | Oncogene2003，22，33： | 1 |
| 8 | A new spectrophotometric method for the determination of ferrous iron in the presence of ferric iron 显示文摘 | HERRERA L RUIZ P AGUILLON J C FEHRMANN A | 1989 | Journal of Chemical Technology and Biotechnology1989，44，3： | 1 |
| 9 | Human papillomavirus type 31 E5 protein supports cell cycle progression and activates late viral functions upon epithelial differentiation显示文摘 | Fehrmann F Klumpp DJ Laimins LA | 2003 | J Virol2003，77，5： | 1 |
| 10 | Diels-Alder-Reaktionen(Ⅳ): Untersuchungen über die mischdimerisierung von cyclopentadien mit butadien-(1, 3)显示文摘 | Fehrmann W Hampel M Pritzkow W R?llig M | 1975 | Journal für Praktische Chemie1975，317，6： | 1 |
| 11 | Comparison of linear and mixed-effect regression models and a k-nearest neighbour ap- proach for estimation of single-tree biomass 显示文摘 | Fehrmann L Lehtonen A Kleinn C | 2008 | Canadian Journal of Forest Research2008，38，1： | 1 |
| 12 | Association of retinal vasculitis (Eales' disease) and Meniere-like vestibulocochlear symptoms显示文摘 | Wagner W Fehrmann A | 1990 | Eur Arch Otorhinol1990，263，： | 1 |
| 13 | Human papillomaviruses: targeting differentiating epithelial cells for malignant transformation 显示文摘 | Laimins LA | 2003 | Onccgene2003，22，33： | 1 |
| 14 | Profiling studies in ovarian cancer: a review显示文摘 | Fehrmann RS Li XY Van Der Zee AG | 2007 | Oncologist2007，12，8： | 1 |
| 15 | The hepatitis C virus nonstructural protein 4B is an integral endoplasmic reticulum membrane protein显示文摘 | Hugle T Fehrmann F Bieck E | 2001 | Virology2001，284，1： | 1 |
| 16 | Activity and deac- tivation of sulphated TiO2- and ZrO2-based V, Cu, and Fe oxide catalysts for NO abatement in alkali containing flue gases 显示文摘 | Kustov A L Rasmussen S B Fehrmann R | 2007 | Ap- plied Catalysis B : Environmental2007，76，12： | 1 |
| 17 | The hepatitis C virus nonstructural protein 4B is all integra/ endoplasmic reticulum membrane protein显示文摘 | Hugle TF Fehrmann E Bieck M | 2001 | Virology2001，284，1： | 1 |
| 18 | Human papillomaviruses:targeting differentiating epithelial cells for malignant transformation显示文摘 | Fehrmann F LaiminsLA | 2003 | Oncogene2003，22，33： | 1 |
| 19 | Effects of Field Application of Tebuconazole on Yield, Thousand Grain Weight and the Mycotoxin Content of Fusarium-infected Wheat Grain显示文摘 | HARNDORK S FEHRMANN H BECK R | 2000 | Journal of Phytopathology2000，148，： | 1 |
| 20 | Vanadia supported on zeolites for SCR of NO by ammonia显示文摘 | Putluru S S R Riisager A Fehrmann R | 2010 | Appl Cat B:En- viron2010，97，： | 1 |
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