gdManager-class: Class "gdManager"

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

Description

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

Objects from the Class

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

Slots

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

Methods

getGrp

signature(gd = "gdManager", ind = "numeric"): ...

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

Note

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.

Author(s)

Vince Carey <[email protected]>

Examples

1
showClass("gdManager")

geeni documentation built on May 2, 2019, 4:48 p.m.