ANOVA to Estimate if ‘Triples’ are a Valid Subset
Function to execute a simple ANOVA to determine if the Field Duplicates are a valid subset of the regional coverage samples, and if the Field Duplicates pairs have ‘equivalent’ variability. Optionally the data may be logarithmically (base 10) transformed.
a file of regional coverage and field duplicate data.
the Replicate Status code.
by default the character string for the data file name,
if a logarithmic transformation of the data is required to meet homogeneity of variance considerations (i.e. severe heteroscedasticity) set
Any less than detection limit values represented by negative values, or zeros or other numeric codes representing blanks in the data, must be removed prior to executing this function, see
NAs in the data must also be removed prior to running the
triples.fgx function. This requires care as the data must be in complete duplicate sets.
Robert G. Garrett
Garrett, R.G., 2013. Assessment of local spatial and analytical variability in regional geochemical surveys with a simple sampling scheme. Geochemistry: Exploration, Environment, Analysis, 13(4):349-354, doi 10.1144.geochem2011-085.
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