takefirst

Takes all rows of a data frame up to and including the first occurrence of a supplied criteria for grouped data.

Streamlines the process of transitioning between data formats commonly used in survival analysis. Functions convert longitudinal data between formats used as input for survival models as well as support overall preparation. Users are able to focus on model building rather than data wrangling.

Charles Ingulli

wlsd

Wrangling Longitudinal Survival Data

takefirst function

<dl> <dt>data</dt>
<dd>A data frame with relevant columns.</dd> <dt>id</dt>
<dd>A character string of the identification vector name defining groups in <code>data</code>.</dd> <dt>criteria.column</dt>
<dd>The name as a character string of the column in <code>data</code> where the criteria is located.</dd> <dt>criteria</dt>
<dd>The value of the cutoff for subsetting.</dd></dl>

Arguments

Subset observations for grouped data based on first occurrence of a criteria value — takefirst

<dl>

 <dt>data</dt>
<dd>A data frame with relevant columns.</dd>

 <dt>id</dt>
<dd>A character string of the identification vector name defining groups in <code>data</code>.</dd>

 <dt>criteria.column</dt>
<dd>The name as a character string of the column in <code>data</code> where the criteria is located.</dd>

 <dt>criteria</dt>
<dd>The value of the cutoff for subsetting.</dd>

</dl>

takefirst: Subset observations for grouped data based on first occurrence of a criteria value

Description

Usage

Value

Arguments

Details

Examples