topic Re: How to check the sequence of occurrence in a list in SAS Enterprise Guide

How to check the sequence of occurrence in a list

avalanche — Fri, 12 Aug 2016 06:23:30 GMT

Hi everyone.

I have the following list:

CustNo. LoanType
001 Auto
001 Housing
002 Housing
002 Auto
003 Auto
003 Housing
003 Auto
004 Housing
004 Auto
004 Housing
005 Auto
005 Auto
005 Housing
006 Housing
006 Auto
006 Auto

Expected Output:

CustNo. AutoThenHousing? HousingThenAuto?
001 1 0
002 0 1
003 1 1
004 1 1
005 1 0
006 0 1

As you can see, I want to check the order of loan availment (i.e. auto first then housing? or housing first then auto?) Take note also that there are cases wherein a customer availed multiple loans like 003 and 004. For these customers, both categories are true.

Hope you can guide me on how to implement this in EG.Thanks.

Re: How to check the sequence of occurrence in a list

TomKari — Sun, 14 Aug 2016 21:43:30 GMT

Are you comfortable running some code in a code window, or do you need to completely use the EG tasks to do this?

Tom

Re: How to check the sequence of occurrence in a list

avalanche — Mon, 15 Aug 2016 00:01:14 GMT

Hi Tom. I would prefer to use EG please. Thanks.

Re: How to check the sequence of occurrence in a list

LinusH — Mon, 15 Aug 2016 04:04:20 GMT

Since it seems that the sort order is important to your expected results you want a variable to keep track on the original order. Like a date or an automatically incremental loan no.
If that's not available to you create it as a first step in your project by calling the monotonic() function in the Query builder.
For you inquiry itself, it's kinda row oriented problem. So SQL based Query Builder isn't fit for the task. So my guess you need a data step program solve this. It would probably involve stuff like RETAIN, BY, first./last.- logic and explicit OUTPUT. If these are not familiar to you consider to taking the free online training SAS Programming.

Re: How to check the sequence of occurrence in a list

TomKari — Tue, 16 Aug 2016 14:46:24 GMT

Well, I think it's possible, but it's complicated.

1. Using Query Builder, select everything from your table. Create a new advanced expression, and make the expression

monotonic()

This is an unsupported function that will add the row number to the record. Let's call it SeqNo for the rest of this example.

2. Do the following for both streams, Auto and Housing:

2.1 Select only the records for Auto

2.2 For this table, do a summarized query, keeping CustNo, the min of SeqNo, and the max of SeqNo.

2.3 Do the same two steps for Housing.

3. Create a new query on the result of 2.2, and do a full outer join to the result of 2.3, joining on CustNo. This should give you a dataset with the CustNo, min and max of SeqNo for Auto, and min and max of SeqNo for Housing.

4. With this, create a query. Create your variables Auto_then_Housing and Housing_then_Auto as advanced expressions, where you'll use a Case function to compare the variables. For Auto_then_Housing I used this:

CASE

WHEN (t1.MIN_of_SeqNo_Auto < t1.MAX_of_SeqNo_Housing) & ^missing(t1.MIN_of_SeqNo_Auto)

THEN 1

ELSE 0

END

and for Housing_then_Auto

CASE

WHEN (t1.MIN_of_SeqNo_Housing < t1.MAX_of_SeqNo_Auto) & ^missing(t1.MIN_of_SeqNo_Housing)

THEN 1

ELSE 0

END