Turn on suggestions

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for

- Home
- /
- Programming
- /
- SAS Procedures
- /
- Re: Sum column based on row count

Options

- RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Mute
- Printer Friendly Page

- Mark as New
- Bookmark
- Subscribe
- Mute
- RSS Feed
- Permalink
- Report Inappropriate Content

Posted 08-22-2017 02:51 PM
(1000 views)

Hello,

I have searched all over and can't seem to find an answer for this. For each row, I am attempting to sum the values of the next x rows (3 in the example below) for each item.

Example: Item 1, row count for aggregation = 3, next 3 rows countain 10 in each row which equals a sum of 30. It only sums for the item that corresponds to the row that the sum calculation is on (similar to a group by).

The example below is far simpler than my real data which contains different values for sales for each row.

I am assuming that this would be an iterating do until loop of some sort but I can't seem to think of a strategy. Thanks for all of your insight!

Item | Sales | SumRolling |

1 | 10 | 30 |

1 | 10 | 30 |

1 | 10 | 30 |

1 | 10 | 30 |

1 | 10 | 30 |

1 | 10 | 30 |

1 | 10 | 20 |

1 | 10 | 10 |

2 | 20 | 60 |

2 | 20 | 60 |

2 | 20 | 60 |

2 | 20 | 60 |

2 | 20 | 60 |

2 | 20 | 40 |

2 | 20 | 20 |

2 REPLIES 2

- Mark as New
- Bookmark
- Subscribe
- Mute
- RSS Feed
- Permalink
- Report Inappropriate Content

Do you have SAS ETS? If so, a CONVERT statement is your best bet.

If not, the quickest way, IMO is to reverse the data, use the LAG function and then reverse the data order again. Assuming you can do the re-ordering yourself, here's how the data step may look.

```
data want;
by item sales;
l1=lag(sales);
l2=lag2(sales);
l3=lag3(sales);
if first.item then count=1; else count+1;
if count > 3 then do;
sum = sum(l1, l2, l3);
end;
run;
```

- Mark as New
- Bookmark
- Subscribe
- Mute
- RSS Feed
- Permalink
- Report Inappropriate Content

Secure your spot at the must-attend AI and analytics event of 2024: SAS Innovate 2024! Get ready for a jam-packed agenda featuring workshops, super demos, breakout sessions, roundtables, inspiring keynotes and incredible networking events.

Register by March 1 to snag the Early Bird rate of just $695! Don't miss out on this exclusive offer.

** **

What is Bayesian Analysis?

Learn the difference between classical and Bayesian statistical approaches and see a few PROC examples to perform Bayesian analysis in this video.

Find more tutorials on the SAS Users YouTube channel.