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01-31-2018 12:35 PM

Hello, I'm new to sas using the university edition and having trouble getting multiple sums of a variable. I have rainfall data from 1975 to the present with each day a numeric day of the year (365 or 366 if it's a leap year). I want to make sums of many overlapping time periods. See my code below for what I've tried.

data rainfallsummary;

set work.import;

*this determines leap year;

if (mod(year,4)=0 and(mod(year,100) ne 0 or(mod(year,100)=0 and (mod(year,400)=0)))) then leap=1; else leap=0;

*may;

if ((leap=0) and ((day>=121)and (day<=151)) )then month=5;

if ((leap=1) and ((day>=122)and (day<=152)) )then month=5;

*june;

if ((leap=0) and ((day>=152)and (day<=181)) )then month=6;

if ((leap=1) and ((day>=153)and (day<=182)) )then month=6;

*july;

if ((leap=0) and ((day>=182)and (day<=212)) )then month=7;

if ((leap=1) and ((day>=183)and (day<=213)) )then month=7;

*august;

if ((leap=0) and ((day>=213)and (day<=243)) )then month=8;

if ((leap=1) and ((day>=214)and (day<=244)) )then month=8;

*june 15 to july 15;

*if ((leap=0) and ((day>=166)and (day<=196)) )then month=6.5;

*if ((leap=1) and ((day>=167)and (day<=197)) )then month=6.5;

run;

proc means data=rainfallsummary;

class year month;

var rain;

output out=work.rainTotals sum=sum;

run;

I want to be able to get the sum of the rain during days 166 to 196 but this doesn't work with my code since I have more than one "month" for days 166 to 196.

Is there any way to solve this?

Thanks!

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Posted in reply to CalebN

01-31-2018 12:39 PM

What are the rules for the overlapping periods? This sounds like a moving sum?

If so, using an approach as outlined here is likely a better method:

http://support.sas.com/kb/25/027.html

You're also likely better off using a format to create your date ranges, than many if/then statements.

CalebN wrote:

Hello, I'm new to sas using the university edition and having trouble getting multiple sums of a variable. I have rainfall data from 1975 to the present with each day a numeric day of the year (365 or 366 if it's a leap year). I want to make sums of many overlapping time periods. See my code below for what I've tried.

data rainfallsummary;

set work.import;

*this determines leap year;

if (mod(year,4)=0 and(mod(year,100) ne 0 or(mod(year,100)=0 and (mod(year,400)=0)))) then leap=1; else leap=0;

*may;

if ((leap=0) and ((day>=121)and (day<=151)) )then month=5;

if ((leap=1) and ((day>=122)and (day<=152)) )then month=5;

*june;

if ((leap=0) and ((day>=152)and (day<=181)) )then month=6;

if ((leap=1) and ((day>=153)and (day<=182)) )then month=6;

*july;

if ((leap=0) and ((day>=182)and (day<=212)) )then month=7;

if ((leap=1) and ((day>=183)and (day<=213)) )then month=7;

*august;

if ((leap=0) and ((day>=213)and (day<=243)) )then month=8;

if ((leap=1) and ((day>=214)and (day<=244)) )then month=8;

*june 15 to july 15;

*if ((leap=0) and ((day>=166)and (day<=196)) )then month=6.5;

*if ((leap=1) and ((day>=167)and (day<=197)) )then month=6.5;

run;

proc means data=rainfallsummary;

class year month;

var rain;

output out=work.rainTotals sum=sum;

run;

I want to be able to get the sum of the rain during days 166 to 196 but this doesn't work with my code since I have more than one "month" for days 166 to 196.

Is there any way to solve this?

Thanks!

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Posted in reply to Reeza

01-31-2018 03:11 PM

If you just want to get the sum of the rain during days 166 to 196 per month per year, add where statement in Proce means procedure as:

where 166<=day<=196;

Otherwise, please provide an example output.

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Posted in reply to MINX

01-31-2018 03:14 PM - edited 01-31-2018 03:15 PM

Sums of many overlapping groupings can be done using a Multilabel format, and then running the data through PROC MEANS or PROC SUMMARY. An example of multilabel formats are shown here: http://documentation.sas.com/?cdcId=pgmmvacdc&cdcVersion=9.4&docsetId=proc&docsetTarget=p1upn25lbfo6... which seems to meet your needs as stated in your original post.

--

Paige Miller

Paige Miller

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Posted in reply to Reeza

01-31-2018 04:02 PM

I would suggest using day and year to create a SAS date value and then manipulate from there with date functions and or formats.

You do not mention anything about your range of years but a custom multilabel format could be made to make the correct group:

data work.example; input year day rain; date= datejul(year*1000+day); format date date9.; Month=month(date); datalines; 2016 1 1 2016 59 2 2016 60 3 2016 61 4 2016 123 5 2016 155 .4 2016 168 .3 2017 1 .4 2017 59 .5 2017 60 .6 2017 61 .7 2017 123 .8 2017 155 .4 2017 167 .3 ; run; proc format library=work; value custmonth (multilabel notsorted) '01Jan2016'd - '31DEC2016'd = [year8.] '01Jan2016'd - '31DEC2016'd = [mmyy8.] '16JUN2016'd - '30Jun2016'd = '6.5M2016' '01Jan2017'd - '31DEC2017'd = [year8.] '01Jan2017'd - '31DEC2017'd = [mmyy8.] '16JUN2017'd - '30Jun2017'd = '6.5M2017' ; run; proc means data=work.example; class date /mlf; format date custmonth. ; var rain; output out=work.exampletotals sum=sum; run; proc sort data=work.exampletotals; by date; run;