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

VariableDescription
idindividual identifiers
obsIDidentifier for unique choice observation
altalternative in each choice observation
choicedummy code for choice (1 or 0)
priceprice of yogurt
featdummy for whether a newspaper advertisement was shown to the customer (1 or 0)
brandyogurt 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