GrowthRates | R Documentation |
Calculates either the Absolute Growth Rate (AGR), Proportionate Growth
Rate (PGR) or Relative Growth Rate (RGR) between pairs of time points,
the second of which is lag
positions before the first.
in x
.
AGRdiff(x, time.diffs, lag=1)
PGR(x, time.diffs, lag=1)
RGRdiff(x, time.diffs, lag=1)
x |
A |
time.diffs |
a |
lag |
A |
The AGRdiff is calculated as the difference between a pair of values divided by the time.diffs
.
The PGR is calculated as the ratio of a value to a second value which is lag
values
ahead of the first in x
and the ratio raised to the
power of the reciprocal of time.diffs
.
The RGRdiff is calculated as the log
of the PGR and so is equal to the difference between
the logarithms of a pair of values divided by the time.diffs
.
The differences and ratios are obtained using calcLagged
with lag = 1
.
A numeric
containing the growth rates which is the same length as x
and in which the first lag
values NA
.
Chris Brien
byIndv4Intvl_GRsAvg
, byIndv4Intvl_GRsDiff
, byIndv4Times_GRsDiff
, byIndv4Times_SplinesGRs
,
calcLagged
data(exampleData)
longi.dat$PSA.AGR <- with(longi.dat, AGRdiff(PSA, time.diffs = DAP.diffs))
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