How do I modify proc summary output to create a table

[JenMMerc]

Good morning,

I am trying to create 3 year moving average rates from a large birth file. I have used proc summary to get the data into a format to create the rates by year 

proc summary data=ptm_denom;
  class year;
  var preterm birth;
  output out=ptmtab sum=preterm birth;
  run;
  proc print data=ptmtab;
  run;
  data ptm_rate (drop = _type_ _freq_);
  set ptmtab;
  ptmrate = (preterm/birth)*100;
  run;
proc print data=ptm_rate noobs;
var year preterm birth ptmrate;
run;

And my output looks like this:

year preterm birth ptmrate

.	3986	52025	7.66170
2007	439	5549	7.91134
2008	453	5627	8.05047
2009	453	5517	8.21098
2010	453	5298	8.55040
2011	394	5082	7.75285
2012	363	5069	7.16118
2013	368	4946	7.44036
2014	374	5031	7.43391
2015	328	4977	6.59032
2016	361	4929	7.32400

but I can't figure out how to sum and average the data and manipulate the table so my output looks like this:

	2007-2009	2008-2010	2009-2011	2010-2012	2011-2013	2012-2014	2013-2015	2014-2016
preterm
birth
ptmrate

This seems like there would be an easy solution, but I can't figure one out. Any help would be great!

[PaigeMiller]

PROC EXPAND (if you have it in your SAS license) can provide 3 year moving averages of your data.

Since your output is vertical but the table you want is horizontal, you could transpose your output, then use ARRAYs in a data step to get three year moving averages.

But just a word to the wise ... keep your final table vertical, not horizontal, it's a much easier format for SAS to work with, and much easier for people to read.