NBDdirichlet: print.dirichlet – R documentation

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print.dirichlet

Print Dirichlet model information

Description

This function prints a 'dirichlet' object. It is a method for the generic function print of class 'dirichlet'. It prints descriptive information on the product category, brand, and the estimated Dirichlet model parameters.

Usage

## S3 method for class 'dirichlet'
print(x,...)

Arguments

`x`	An object of "dirichlet" class.
`...`	Other parameters passing to the generic function

Details

The following information is printed:

Number of brands in the category
Brand list
Brands' market shares.
Brands' penetrations.
The multiple of the base time period that indicates the study time period, and the corresponding M value.
Category penetration and category buying rate.
Estimated dirichlet model parameters: M (for base period), K, and S.

Value

NULL

Author(s)

Feiming Chen

References

The Dirichlet: A Comprehensive Model of Buying Behavior. G.J. Goodhardt, A.S.C. Ehrenberg, C. Chatfield. Journal of the Royal Statistical Society. Series A (General), Vol. 147, No. 5 (1984), pp. 621-655

Examples

cat.pen <- 0.56 # Category Penetration
cat.buyrate <- 2.6 # Category Buyer's Average Purchase Rate in a given period.
brand.share <- c(0.25, 0.19, 0.1, 0.1, 0.09, 0.08, 0.03, 0.02) # Brands' Market Share
brand.pen.obs <- c(0.2,0.17,0.09,0.08,0.08,0.07,0.03,0.02) # Brand Penetration
brand.name <- c("Colgate DC", "Macleans","Close Up","Signal","ultrabrite",
"Gibbs SR","Boots Priv. Label","Sainsbury Priv. Lab.")

dobj <- dirichlet(cat.pen, cat.buyrate, brand.share, brand.pen.obs, brand.name)
print(dobj)  # YOU WILL SEE THE FOLLOWING:

# Number of Brands in the Category = 8 
# Brand List : Colgate DC : Macleans : Close Up : Signal : ultrabrite :
#              Gibbs SR : Boots Priv. Label : Sainsbury Priv. Lab.
# Brands' Market Shares: 0.25 0.19 0.1 0.1 0.09 0.08 0.03 0.02 
# Brands' Penetration:   0.2 0.17 0.09 0.08 0.08 0.07 0.03 0.02 
# Multiple of Base Time Period: 1 , Current M = 1.456 

# Channel Penetration = 0.56 , with Shopping Rate = 2.6 
# Estimated Dirichlet Model Parameters:
# NBD: M = 1.46 ,  K = 0.78 ;  Dirichlet: S = 1.55

NBDdirichlet

NBD-Dirichlet Model of Consumer Buying Behavior for Marketing Research

v1.3

GPL-3

Authors