Description Objects from the Class Slots Methods Note Author(s) Examples

illustrative class for a data provider based on nlme groupedData, but with an ff back end

Objects can be created by calls of the form `new("gdManager", ...)`

.

`discrim`

:Object of class

`"ff_vector"`

a representation of the run length encoding of the grouped structure label, which changes values as we traverse records from different groups, like the ‘id’ variable often used in GEE or NLME applications`numdat`

:Object of class

`"ff_matrix"`

numerical data for modeling, stored in ff matrix format`formula`

:Object of class

`"formula"`

used to describe the nlme groupedData structure

- getGrp
`signature(gd = "gdManager", ind = "numeric")`

: ...

returns the numerical data for a specified group; ind is a sequential index.

This is very experimental. We want to extend the `data=`

pattern often used for
R modeling functions, where it is expected that an R data frame is bound to `data`

.
Instead we want to think of a data provider, that will provide numerical data for
analysis upon request. For GEE, the natural type of request is to acquire the data
for a cluster of observations. The `getGrp`

method accomplishes this.

Vince Carey <[email protected]>

1 | ```
showClass("gdManager")
``` |

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