computer.def

acc mem mul r year

  OBS: 82 observations from 1960-65
  
	acc  	= the average time to retrieve information from memory (access)
	mem  	= a measure of the memory of the computer
	mul  	= average time for multiplication, microseconds
	r 	= monthly rental price, in thousands
	year 	= year

Data Source: based on work published by Chow (1967) and investigated further by Berndt (1991).
             
    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
         acc |        82    756.5878    3272.535         .5      25600
         mem |        82    935.0024    1918.829        7.2      14080
         mul |        82    4830.445    23169.91          1     200000
           r |        82    15.33744    22.64702        .68        160
        year |        82    62.81707    1.678683         60         65