carseg

Segment shares of car sales in five categories according to the size of the car chassis, with explanatory variables.

datasets

Main properties and regression procedures using a generalization of the Dirichlet distribution called Simplicial Generalized Beta distribution. It is a new distribution on the simplex (i.e. on the space of compositions or positive vectors with sum of components equal to 1). The Dirichlet distribution can be constructed from a random vector of independent Gamma variables divided by their sum. The SGB follows the same construction with generalized Gamma instead of Gamma variables. The Dirichlet exponents are supplemented by an overall shape parameter and a vector of scales. The scale vector is itself a composition and can be modeled with auxiliary variables through a log-ratio transformation. Graf, M. (2017, ISBN: 978-84-947240-0-8). See also the vignette enclosed in the package.

Monique Graf

Simplicial Generalized Beta Regression

carseg function

A data frame with 152 observations on the following 13 variables.<dl>
 <dt>SA</dt>
<dd>Segment share in category A</dd> <dt>SB</dt>
<dd>Segment share in category B</dd> <dt>SC</dt>
<dd>Segment share in category C</dd> <dt>SD</dt>
<dd>Segment share in category D</dd> <dt>SE</dt>
<dd>Segment share in category E</dd> <dt>expend</dt>
<dd>quarterly household expenditures</dd> <dt>sent</dt>
<dd>monthly confidence indicator made up of several branches</dd> <dt>FBCF</dt>
<dd>monthly households investment</dd> <dt>PAC</dt>
<dd>binary vector indicating the incentive period</dd> <dt>PIB</dt>
<dd>Gross domestic product</dd> <dt>price</dt>
<dd>gas oil price</dd> <dt>rates</dt>
<dd>monthly short term interest rates</dd> <dt>month</dt>
<dd>sequential month number (1 to 150)</dd> 
</dl>

Format

carseg dataset — carseg

A data frame with 152 observations on the following 13 variables.<dl>
 <dt>SA</dt>
<dd>Segment share in category A</dd>

 <dt>SB</dt>
<dd>Segment share in category B</dd>

 <dt>SC</dt>
<dd>Segment share in category C</dd>

 <dt>SD</dt>
<dd>Segment share in category D</dd>

 <dt>SE</dt>
<dd>Segment share in category E</dd>

 <dt>expend</dt>
<dd>quarterly household expenditures</dd>

 <dt>sent</dt>
<dd>monthly confidence indicator made up of several branches</dd>

 <dt>FBCF</dt>
<dd>monthly households investment</dd>

 <dt>PAC</dt>
<dd>binary vector indicating the incentive period</dd>

 <dt>PIB</dt>
<dd>Gross domestic product</dd>

 <dt>price</dt>
<dd>gas oil price</dd>

 <dt>rates</dt>
<dd>monthly short term interest rates</dd>

 <dt>month</dt>
<dd>sequential month number (1 to 150)</dd>

 
</dl>

carseg: carseg dataset

Description

Usage

Arguments

Format

Details

References

Examples