Graduate Thesis Or Dissertation
 

The use of objective sampling procedures in estimating Oregon filbert production

Pubblico Deposited

Contenuto scaricabile

Scarica il pdf
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/g158bm602

Descriptions

Attribute NameValues
Alternative Title
Creator
Abstract
  • In an attempt to improve the mid-season forecast of filbert production, objective measure techniques were started in 1955 on an experimental basis. In the following years an adjusted ratio estimate was used to forecast the filbert production. The purpose of this study was to review the different assumptions and consider different estimating models. Following a survey of the entire producing area in the Pacific Northwest, a probability sample of trees from 350 orchards was selected. Counts of nuts and defects and nut weights were taken from the sample trees in July of each year to provide data for a forecast of the fall harvest. A subsample of nuts was sized and the size distribution of the nuts examined. A sample of harvested nuts was taken to determine the average nut weights and the defects for each size class. Results showed that little precision can be gained by geographical stratification. Direct expansion estimates are more precise and yield smaller deviations from the actual production than ratio estimates. The estimates met the objective of a sampling error less than five percent of the production estimate. Larger than expected deviation of the estimates from the actual production can be accounted for by the failure to forecast the changes between survey and harvest time. Examination of size distribution indicates that the estimated percent defects cannot be used alone for forecast the losses after sampling time, because a portion of the good nuts will not be harvested or will be lost during the handling procedures if they are too small to be classified as commercial. Other non-sampling errors are also discussed, but these errors can be minimized by better supervision of the sampling procedures. It is believed that future investigations should be focused on understanding changes which take place after a sampling time to improve the production estimates. There is little need for further improvement of the precision of the estimates, because the estimates met the objective of a sampling error less than five percent of the production estimate.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Dichiarazione dei diritti
Publisher
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 5.0 was used for pdf compression and textual OCR.
Replaces

Le relazioni

Parents:

This work has no parents.

In Collection:

Elementi

Thumbnail Titolo Data caricata Visibilità Azioni
file details HuszarCharlesK1967_Redacted.pdf 2017-08-16 Pubblico Scaricare