ch10.def

x y z1 z2 z3 
  
  Obs:   100 observations

These data are artificial and generated from y = 1 + x + e, where x and e are N(0,1).
The z variables are also N(0,1) with

corr(x,e) = .6
corr(z1,e) = 0
corr(z2,e) = 0
corr(z1,x) = .5
corr(z2,x) = .3
corr(z3,x) = .5
corr(z3,e) = .3


    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
           x |       100    .2391607    .9566551    -1.6484    2.76628
           y |       100    1.386287    1.838819   -2.96671    6.72735
          z1 |       100    .0342066    .8931078   -2.61576    2.09323
          z2 |       100    .1205662    1.027656   -2.29936    2.10895
          z3 |       100     .062191    1.100069   -2.98265     3.1457