【转载】SAS INTNX详解

2010-06-13 15:30:39|  分类： 统计知识 |  标签： |举报 |字号大中小 订阅

在时间序列分析中，INTNX是比较常用的函数，用于输入时间。

形式如：INTNX(interval,start-from, increment) 。书上的用法一贯比较简单，网上搜索一下，该函数至少包括以下几种用法。

 

Example1. Some simple examples of using INTNX function:

format day week month_ year date9.;
 
day=intnx('day', '01FEB2010'd, 7); 
week=intnx('week', '01FEB2010'd, 1); 
month_=intnx('month', '01FEB2010'd, 2); 
year=intnx('year', '01FEB2010'd, 1); 

结果：

day = 08FEB2010 (+7 days)
week = 07FEB2010 (next Sunday)
month_ = 01APR2010 (next 1st day of 2nd next month)
year = 01JAN2011 (next 1st day of next year)

Example2. Multiplying and shifting intervals.

You may change the first argument (interval) by adding digits as in the example below.

format day week year date9.;
 
day=intnx('day2', '01FEB2010'd, 2); 
week=intnx('week1.3', '01FEB2010'd, 1); 
year=intnx('year1.3', '01FEB2010'd, 1); 

结果：

day = 05FEB2010 (+2 days twice)
week = 02FEB2010 (Next Tuesday)
year = 01MAR2011 (Next Year's third month (March) 1st day)

You are free to combine intervals by multiplying and shifting it. However, please be careful when contructing complex interval specifications.

 

Example3. Datetime and time formats.

The INTNX function may cope with datetime, time and date formats. The above examples are based on date format. The example below uses datetime and time formats.

format seconds minutes hours days weeks datetime20.;
format t_seconds t_minutes t_hours time9.;
 
seconds=intnx('second', '01FEB2010:00:00:00'dt, 1); 
minutes=intnx('minute', '01FEB2010:00:00:00'dt, 1); 
hours=intnx('hour', '01FEB2010:00:00:00'dt, 1); 
days=intnx('dtDay', '01FEB2010:00:00:00'dt, 1); 
weeks=intnx('dtWeek', '01FEB2010:00:00:00'dt, 1);
 
t_seconds=intnx('second', '00:00:00't, 1); 
t_minutes=intnx('minute', '00:00:00't, 1); 
t_hours=intnx('hour', '00:00:00't, 1);

结果：

seconds= 01FEB2010:00:00:01 (next second)
minutes= 01FEB2010:00:01:00 (next minute)
hours= 01FEB2010:01:00:00 (next hour)
days= 02FEB2010:00:00:00 (next day)
weeks= 07FEB2010:00:00:00 (next Sunday)
t_seconds = 00:00:01 (next second)
t_minutes = 00:01:00 (next minute)
t_hours = 01:00:00 (next hour)

and so on.

 

Example4. Alignment within the interval.

format beginning middle end sameday date9.;
 
beginning=intnx('month', '05FEB2010'd, 1, 'b'); 
middle=intnx('month', '05FEB2010'd, 1, 'm');  
end=intnx('month', '05FEB2010'd, 1, 'e'); 
sameday=intnx('month', '05FEB2010'd, 1, 's');

结果

beginning = 01MAR2010 (1st day of the next month)
middle= 16MAR2010 (middle day (16 of 31) of the next month)
end= 31MAR2010 (last day (31) of the next month)
sameday = 05MAR2010 (the same day (5) of the next month)

但是我这个程序竟然有问题，谁能解答？

data exp1;
input a1 @@;
m=_n_;
dt=intnx('hour','1jan1996:12:10:00'dt,_n_-1);
format dt DATETIME18.;

cards;
 1000.700   571.900   573.600   368.300   146.600   114.800   122.300
  389.100   571.200   647.600   754.300  1030.200   733.800   541.400
;
run;
proc print data=exp1;
run;