mathematics and statistics
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CitationCarande, V., & Jameson, D. A. (1986). Combination of weight estimates with clipped sample data. Journal of Range Management, 39(1), 88-89.
PublisherSociety for Range Management
JournalJournal of Range Management
AbstractWeight estimation is a common procedure to determine range forage production. In this method clipped samples are used to train an observer, to make periodic checks on observer performances, and to compute estimated/clipped conversion factors. The clipped sample data are then discarded. This is in contrast to a double sampling procedure where both clipped values and estimated values are used in computation of sample variance. However, if both estimated values and clipped plots are taken at random, they can be combined to compute sample means and variances by using techniques appropriate to combining data of different variances. The efficiency of the combined sample appears to be greater than that of formal double sampling and also has the advantage that plots clipped for training and checking can also be used as part of the sample.