书本上的，但是运行不出结果data sasuser.example1_9;
input rate@@;
time=intnx('month','01mar2007'd,_n_-1);
format time monyy5.;
cards;
7.7390 7.7247 7.6330 7.5753;
proc print data=sasuser.example1_9;
run;
结果显示:
OTE: Copyright (c) 1999-2000 by SAS Institute Inc., Cary, NC, USA.
NOTE: SAS (r) Proprietary Software Release 8.1 (TS1M0)
      Licensed to UNIVERSITY OF CALIFORNIA/BERKELEY CAMPUS, Site 0029107011.
NOTE: This session is executing on the WIN_PRO  platform.



NOTE: SAS initialization used:
      real time           1:11.48
      cpu time            1.09 seconds

1    data sasuser.example1_9;
2    input rate@@;
3    time=intnx('month','01mar2007'd,_n_-1);
4    format time monyy5.;
5    cards;

NOTE: The data set SASUSER.EXAMPLE1_9 has 0 observations and 2 variables.
NOTE: DATA statement used:
      real time           0.45 seconds
      cpu time            0.06 seconds


NOTE: SCL source line.
6    7.7390 7.7247 7.6330 7.5753;
     ------
     180

ERROR 180-322: Statement is not valid or it is used out of proper order.

7    proc print data=sasuser.example1_9;
8    run;

NOTE: No observations in data set SASUSER.EXAMPLE1_9.
NOTE: PROCEDURE PRINT used:
      real time           0.26 seconds
      cpu time            0.01 seconds