cocaine.def

 PRICE QUANT  QUAL  TREND 

   Obs: 56 sales of cocaine 

   PRICE = price per gram in dollars for a cocaine sale,
   QUANT = number of grams of cocaine in a given sale,
   QUAL = quality of the cocaine expressed as percentage purity,
   TREND = a time variable with 1984 = 1 up to 1991 = 8.

These data are a subset of those used in the study Caulkins, J.P. and 
R. Padman (1993), “Quantity Discounts and Quality Premia for Illicit Drugs”, 
Journal of the American Statistical Association, 88, 748-757.


    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
       PRICE |        56     75.4073    27.85159         15        130
       QUANT |        56    204.6866    338.2472        .25       1000
        QUAL |        56    52.00893    18.89312         19         95
       TREND |        56    3.910714     2.26657          1          8