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The notion that samples ought to be random is so firmly engrained in one's mind that it seems almost sacrilegious to object to the application of the rule in a particular case. But after all the problem surely is not whether a tract passing under the name Jones does or does not resemble, in this particular characteristics, a random sample from writings of Brown, but samples from Brown's writing dealing, so far as possible, with same sort of material in the same sort of way. The method of "selected samples" is, from this standpoint, entirely justified and perfectly correct.
PROGRAM p30_f90 IMPLICIT NONE REAL :: X,Y WRITE (*,*) 'X=' READ (*,*) X Y=((2.0*X+5.0)*X+3.0)*X+1.0 WRITE (*,*) 'Y=', Y STOP END PROGRAM p30_f90 $ gfortran -o p30 p30.f90
計量経済学やその周辺の学問体系は、マルクス経済学に由来する学び方の「輪読」や「レジメ」学習法からは何も得るものはないので注意してほしい。自分の手で実際に動かしてその仕組みを知る他はない。