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Evaluation of Simple Quantile Estimation Functions for Modeling Forest Diameter Distributions in Even-Aged Stands of Interior Douglas-fir Item Info

The method of percentiles usually involves simultaneously solving equations for probability distribution parameters as functions of sample-based estimates of the appropriate quantiles. Eight simple distribution-free methods for estimating quantiles from sample-based order statistics were evaluated empirically using even-aged Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco) diameter distributions from the Inland Northwest. Two methods, calculated by weighting adjacent order statistics. consistently gave the best results for both the Weibull and Johnson's So distributions. Certain distributional shapes were also evaluated to determine if they influenced the quantile estimation method. Although some influence was detected. the best methods were usually best across all categories.

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Title:
Evaluation of Simple Quantile Estimation Functions for Modeling Forest Diameter Distributions in Even-Aged Stands of Interior Douglas-fir
Creator:
Newberry, J.D.; Moore, J.A.; Zhang, L.
Date Created (ISO Standard):
1993-03-29
Description:
The method of percentiles usually involves simultaneously solving equations for probability distribution parameters as functions of sample-based estimates of the appropriate quantiles. Eight simple distribution-free methods for estimating quantiles from sample-based order statistics were evaluated empirically using even-aged Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco) diameter distributions from the Inland Northwest. Two methods, calculated by weighting adjacent order statistics. consistently gave the best results for both the Weibull and Johnson's So distributions. Certain distributional shapes were also evaluated to determine if they influenced the quantile estimation method. Although some influence was detected. the best methods were usually best across all categories.
Subjects:
research (document genres) statistics
Location:
North and Central Idaho; Eastern Washington; Western Montana; Northeastern Oregon
Publisher:
Canadian Journal of Forest Research
Source:
Newberry, J.D., J.A. Moore, L. Zhang. 1993. Evaluation of simple quantile estimation functions for modeling forest diameter distributions in even-aged stands of interior Douglas-fir. Can. J. For. Res. Vol. 23:2376-2382
Source Identifier:
Eval_Simple_Quantile_Est_Functions_Modeling_Forest_Diam_Dist_in_Even-Aged_Stands_Interior_DF_CanJFR_023_1993
Type:
text
Format:
application/pdf

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Preferred Citation:
"Evaluation of Simple Quantile Estimation Functions for Modeling Forest Diameter Distributions in Even-Aged Stands of Interior Douglas-fir", Idaho Forestry Research Collection, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/forestryresearch/items/forestryresearch883.html
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Educational use includes non-commercial use of text and images in materials for teaching and research purposes. Digital reproduction rights granted by University of Idaho Library. For other uses beyond educational use, please contact University of Idaho Library Special Collections and Archives Department at libspec@uidaho.edu.
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