options crt;  ? 11e2
in mroz;   ? contains PRIN and LWW1 if 11e1 has been run

title 'Exercise 2, part (a) - checking WHRS';
select lfp=0;
msd(terse) whrs;

title 'Exercise 2, part (a) - truncated regression';
select 1;
olsq whrs c kl6 k618 wa we lww1 prin;

title 'Exercise 2, part (b) - uncompensated elasticities';
frml e1 ewage = lww1/1500;
frml e2 eprin = prin*1000/1500;
analyz e1 e2;