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The Determination of the Number of Samples Necessary to Measure Differences with Varying Degrees of Precision 1
Author(s) -
Livermore J. R.,
Neely Winston
Publication year - 1933
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1933.00021962002500090002x
Subject(s) - citation , measure (data warehouse) , library science , computer science , information retrieval , database
Since much agronomic research is concerned with the significance of the difference between two means and since it is not always possible to predict which of the means will be the greater, Wood’s original formula will be modified in order that it may be more generally applicable to any situa~ ion. The probable error of a difference (PED)is equal to the square root of the sum of the squared errors of each of the two means, as follows: PED =~/(PEA) ~ + (PEB) ~ A-B