... cpi1 JUN90 114. 3 .2 JUL90 114. 5 .3 AUG90 116.5 131.64 SEP90 118.4 132.75 OCT90 120.8 133.56 NOV90 120.1 133.87 DEC90 118.7 133.88 JAN91 1 19. 0 134.6 9 FEB91 117.2 134.810 MAR91 116.2 ... values is forJune 199 0.data usprice;input cpi ppi @@;date = intnx( 'month', '1jun 199 0'd, _n_-1 );format date monyy7.;datalines;1 29. 9 114. 3 130.4 114. 5 131.6 116.5132.7 ... January 1, 196 0, February 1, 196 1, March 1, 196 2, and so forth, and the intervals December1, 195 9, November 1, 195 8, and so on before the base date January 1, 196 0.Similarly, the WEEK2 interval...