# splitContGRdiff

##### Adds the growth rates calculated continuously over time for subsets
of a response to a `data.frame`

Uses `AGRdiff`

, `PGR`

and
`RGRdiff`

to calculate growth rates continuously
over time for subsets of the values of `response`

and
stores the results in `data`

. The subsets are those values
with the same levels combinations of the factors listed in
`INDICES`

.

##### Usage

```
splitContGRdiff(data, responses, INDICES,
which.rates = c("AGR","PGR","RGR"), suffices.rates=NULL,
times.factor = "Days")
```

##### Arguments

- data
A

`data.frame`

containing the columns for which growth rates are to be calculated.- responses
A

`character`

giving the names of the columns in`data`

for which growth rates are to be calculated.- INDICES
A

`character`

giving the name(s) of the`factor`

(s) that define the subsets of`response`

for which growth rates are to be calculated continuously. If the columns corresponding to`INDICES`

are not`factor`

(s) then they will be coerced to`factor`

(s). The subsets are formed using`by`

.- which.rates
A

`character`

giving the growth rates that are to be calculated. It should be a combination`"AGR"`

,`"PGR"`

and`"RGR"`

.- times.factor
A

`character`

giving the name of the column in`data`

containing the factor for times at which the data was collected. Its levels will be used in calculating growth rates and should be numeric values stored as characters.- suffices.rates
A

`character`

giving the characters to be appended to the names of the responses to provide the names of the columns containing the calculated growth rates. The order of the suffices in`suffices.rates`

should correspond to the order of the elements of`which.rates`

. If`NULL`

, the values of`which.rates`

are used.

##### Value

A `data.frame`

containing `data`

to which has been
added a column for the differences between the `times.factor`

,
if it is not already in `data`

, and
columns with growth rates. The name of the column for `times.factor`

differences will be the `times.factor`

with `".diff"`

appended and,
for each of the growth-rate columns will
be the value of `response`

with one of `".AGR"`

, `".PGR"`

or `"RGR"`

or the corresponding value from `suffices.GR`

appended.

##### See Also

##### Examples

```
# NOT RUN {
data(exampleData)
longi.dat <- splitContGRdiff(longi.dat, response="Area.smooth",
INDICES = "Snapshot.ID.Tag", which.rates=c("AGR", "RGR"))
# }
```

*Documentation reproduced from package growthPheno, version 1.0-13, License: GPL (>= 2)*