Description Usage Arguments Details Value Author(s) See Also Examples

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`

.

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`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

`intervalGRaverage`

, `intervalGRdiff`

, `splitContGRdiff`

, `splitSplines`

, `calcLagged`

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