ABSTRACT
Table 1 lists four frequently used formulae called
herein empirical predictor equations.
Although these formulae are accepted in lit-
erature to predict PPV from available data, in most
cases they result in unacceptable values compared to
posterior measured ones, i.e. in nearly all cases pre-
dict erroneous values. Also these formulae actually
are obtained from setting a correlation between the
charge per delay value, the distance value and PPV
value through statistical analysis. So human interven-
tion on statistical analysis results in a predictor which
its general formula is arbitrarily chosen and inevita-
bly will predict different PPVs compared to measured
ones. However, nowadays computer based softwares
prove viable and accurate computations on which
PPV values can be obtained with maximum accuracy
in prediction results.
