precision {gmGeostats} | R Documentation |
Precision calculations
Description
Precision calculations
Usage
precision(x, ...)
## S3 method for class 'accuracy'
precision(x, ...)
Arguments
x |
an object from which precision is to be computed |
... |
generic functionality, not used |
Value
output depends on input and meaning of the function (the term precision
is highly polysemic)
Methods (by class)
-
accuracy
: Compute precision and goodness for accuracy curves, after Deutsch (1997), using the accuracy curve obtained withaccuracy()
. This returns a named vector with two values, one forprecision
and one forgoodness
.Mean accuracy, precision and goodness were defined by Deutsch (1997) for an accuracy curve
, where
are a sequence of nominal confidence of prediction intervals and each
is the actual coverage of an interval with nominal confidence
. Out of these values, the mean accuracy (see
mean.accuracy()
) is computed aswhere the indicator
is 1 if the condition is satisfied and 0 otherwise. Out of it, the area above the 1:1 bisector and under the accuracy curve is the precision
which only takes into account those points of the accuracy curve where
. To consider the whole curve, goodness can be used
See Also
Other accuracy functions:
accuracy()
,
mean.accuracy()
,
plot.accuracy()
,
validate()
,
xvErrorMeasures.default()
,
xvErrorMeasures()