vfselectvisit

Type of selection, do we want visits from <code>last</code>, from first <code>first</code>, within a <code>date</code> range, or specific visit numbers. Default is <code>last</code>

number of tests to select from <code>last</code>, <code>first</code>, or a <code>date</code> range. If <code>sel</code> is an array of indices or set to a <code>date</code> range, <code>numTests</code> is overruled. Default is <code>1</code>

numTests

when <code>sel = "date"</code> is date from (inclusive). If it is <code>NA</code>, then the data is set to <code>1900-01-01</code>. Default is <code>NA</code>

beginDate

when <code>sel = "date"</code> is date to (inclusive). If it is <code>NA</code>, then the data is set to today. Default is <code>NA</code>

endDate

select a determined amount of visits a vf-object. This is done if the interest is to select the last n visits, or the first n visits, or visits within a range, etc

A collection of tools for analyzing the field of vision.
        It provides a framework for development and use of innovative
        methods for visualization, statistical analysis, and clinical
        interpretation of visual-field loss and its change over time.
        It is intended to be a tool for collaborative research.

vfselectvisit: select visits per subject from a vf-object

Description

Usage

Arguments

Value

Examples