Data step - date format and if then else condition (HEDIS measure)

[bhca60]

I am trying to get the difference in days between dates (char $10.) and merging two tables that are sorted by id.  I'm doing a HEDIS and in the end there has to be a numerator and denominator to get a percentage.  This is part of the numerator portion so I'm trying to flag all the conditions that meet what should be in the numerator:

22         GOPTIONS ACCESSIBLE;
23         DATA NUMERATOR1;
24         MERGE denom_final (in=a)  
25               numerator  (in=b) ;
26         	  DIF_DAYS=intck('day',input(ddate,yymmdd10.), input(edate,yymmdd10.));
27         	  if a;
28         	  if b then condition = "aaa" and DATEDIF <= '14' then Followup='1';
                                                                 ____
                                                                 388
                                                                 202
ERROR 388-185: Expecting an arithmetic operator.

ERROR 202-322: The option or parameter is not recognized and will be ignored.

29         	 ELSE IF CONDITION = "hhh" AND DATEDIF <= '7' THEN Followup='1';
30            	 ELSE IF CONDITION = "ccc" AND DATEDIF <= '14' THEN Followup='1';
31         	 ELSE IF CONDITION = "sss" AND DATEDIF <= '14' THEN Followup='1';
32         	 ELSE IF CONDITION = "ddd" AND DATEDIF <= '30' THEN Followup='1';
33         	 ELSE IF CONDITION = "ooo" AND DATEDIF <= '30' THEN Followup='1';
34              Denom = '1';
35         RUN;

[Reeza]

if b then condition = "aaa" and DATEDIF <= '14' then Followup='1';

This statement is incorrect, syntax wise. 

What are you trying to do here? Are both conditions required?

This may possibly be what you need:

if b  & DIF_DAYS <= 14 then do;
    Followup=1;
    condition = 'aaa';
end;

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@bhca60 wrote:

I am trying to get the difference in days between dates (char $10.) and merging two tables that are sorted by id.  I'm doing a HEDIS and in the end there has to be a numerator and denominator to get a percentage.  This is part of the numerator portion so I'm trying to flag all the conditions that meet what should be in the numerator:

22         GOPTIONS ACCESSIBLE;
23         DATA NUMERATOR1;
24         MERGE denom_final (in=a)  
25               numerator  (in=b) ;
26         	  DIF_DAYS=intck('day',input(ddate,yymmdd10.), input(edate,yymmdd10.));
27         	  if a;
28         	  if b then condition = "aaa" and DATEDIF <= '14' then Followup='1';
                                                                 ____
                                                                 388
                                                                 202
ERROR 388-185: Expecting an arithmetic operator.

ERROR 202-322: The option or parameter is not recognized and will be ignored.

29         	 ELSE IF CONDITION = "hhh" AND DATEDIF <= '7' THEN Followup='1';
30            	 ELSE IF CONDITION = "ccc" AND DATEDIF <= '14' THEN Followup='1';
31         	 ELSE IF CONDITION = "sss" AND DATEDIF <= '14' THEN Followup='1';
32         	 ELSE IF CONDITION = "ddd" AND DATEDIF <= '30' THEN Followup='1';
33         	 ELSE IF CONDITION = "ooo" AND DATEDIF <= '30' THEN Followup='1';
34              Denom = '1';
35         RUN;

---

[bhca60]

yes both conditions are required for each of the 6 conditions (aaa, ccc, hhh...etc.) and they all equal 1 because in the end they will be added up to give a number for the numerator which will then be divided by a denominator number.

[bhca60]

The Do statement seems to work as it did populate the followup=1 column but I am having issues with the dif_days column and getting a Note about it:

26 DIF_DAYS=intck('day', input(ddate,yymmdd10.), input(edate,yymmdd10.));
NOTE: Numeric values have been converted to character values at the places given by: (Line):(Column).
26:32
NOTE: Invalid argument to function INPUT at line 26 column 26.

[Reeza]

Is DIF_DAYS a different variable than DATEDIF?

You are treating DATEDIF as character (compared to '14' quotes means character).

[bhca60]

I forgot to change those to dif_days but i still get the same error even when changing it to dif_days from datedif.

[Reeza]

You have a several issues most likely.

• Missing dates is a possibility in INTCK
• Referring to variables with incorrect names
• Referring to variables with incorrect types, ie numeric versus character - '14', '7'
• Assigning variables that should be numeric character types, ie followup='1'; Why do you want followup to be a character variable? If you don't plan to do any math on this variable that's fine though.
• Incorrect syntax on an IF statement. 

Fix your mistakes one at a time and go through them in ORDER. Start with the dates and then go down, otherwise, they cause more issues later on.

[Reeza]

        DATA NUMERATOR1;
       MERGE denom_final (in=a)  
             numerator  (in=b) ;
        	  DIF_DAYS=intck('day',input(ddate,yymmdd10.), input(edate,yymmdd10.));
run;

Do it in stages. 

post the log from above to make sure it works correctly first.

[bhca60]

Below is how I came up with ddate as a variable:

if missing(input(dischdate,yymmdd10.))then ddate= input(edate,yymmdd10.);
else ddate= input(dischdate,yymmdd10.);

So now, I've been trying to get the number of days between ddate and edate since my data is a mix of inpatient and outpatient data and outpatient data does not have dischdate so the edate will replace that if blank.

[Reeza]

If that step ran correctly, then ddate is not a character variable as specified in your initial post. In that case you do not need to use the INPUT function in the INTCK function. 

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@bhca60 wrote:

Below is how I came up with ddate as a variable:

if missing(input(dischdate,yymmdd10.))then ddate= input(edate,yymmdd10.);
else ddate= input(dischdate,yymmdd10.);

So now, I've been trying to get the number of days between ddate and edate since my data is a mix of inpatient and outpatient data and outpatient data does not have dischdate so the edate will replace that if blank.

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