quad_roots

Compute the roots of a quadratic equation

methods

survey

Functions and datasets to support Valliant, Dever, and Kreuter (2018), <doi:10.1007/978-3-319-93632-1>, "Practical Tools for Designing and Weighting Survey Samples". Contains functions for sample size calculation for survey samples using stratified or clustered one-, two-, and three-stage sample designs, and single-stage audit sample designs. Functions are included that will group geographic units accounting for distances apart and measures of size. Other functions compute variance components for multistage designs and sample sizes in two-phase designs. A number of example data sets are included.

Richard Valliant

PracTools

Designing and Weighting Survey Samples

Frauke Kreuter

George Zipf

Jill A. Dever

quad_roots function

<dl> <dt>a</dt>
<dd>coefficient of the quadratic term</dd> <dt>b</dt>
<dd>coefficient of the linear term</dd> <dt>c</dt>
<dd>coefficient of the constant term</dd></dl>

Arguments

Compute the roots of a quadratic equation — quad_roots

<dl>

 <dt>a</dt>
<dd>coefficient of the quadratic term</dd>

 <dt>b</dt>
<dd>coefficient of the linear term</dd>

 <dt>c</dt>
<dd>coefficient of the constant term</dd>

</dl>

quad_roots: Compute the roots of a quadratic equation

Description

Usage

Value

Arguments

Details

Examples