Choice observations of yogurt purchases by 100 households

Data from Jain et al. (1994) containing 2,412 choice observations from a series of yogurt purchases by a panel of 100 households in Springfield, Missouri, over a roughly two-year period. The data were collected by optical scanners and contain information about the price, brand, and a "feature" variable, which identifies whether a newspaper advertisement was shown to the customer. There are four brands of yogurt: Yoplait, Dannon, Weight Watchers, and Hiland, with market shares of 34%, 40%, 23% and 3%, respectively.

data(yogurt)

Format

Variable	Description
id	individual identifiers
obsID	identifier for unique choice observation
alt	alternative in each choice observation
choice	dummy code for choice (1 or 0)
price	price of yogurt
feat	dummy for whether a newspaper advertisement was shown to the customer (1 or 0)
brand	yogurt brand: "yoplait", "dannon", "hiland", or "weight" (for weight watcher)

Source

Raw data downloaded from the package mlogit v0.3-0 by Yves Croissant archive

References

Dipak C. Jain, Naufel J. Vilcassim & Pradeep K. Chintagunta (1994) A Random-Coefficients Logit Brand-Choice Model Applied to Panel Data, Journal of Business & Economic Statistics, 12:3, 317-328, doi:10.1080/07350015.1994.10524547

Examples

data(yogurt)

head(yogurt)
#> # A tibble: 6 × 7
#>      id obsID   alt choice price  feat brand  
#>   <dbl> <int> <int>  <dbl> <dbl> <dbl> <chr>  
#> 1     1     1     1      0  8.1      0 dannon 
#> 2     1     1     2      0  6.10     0 hiland 
#> 3     1     1     3      1  7.90     0 weight 
#> 4     1     1     4      0 10.8      0 yoplait
#> 5     1     2     1      1  9.80     0 dannon 
#> 6     1     2     2      0  6.40     0 hiland