topic Creating a Distance Matrix using Squared Differences in SAS Programming

Creating a Distance Matrix using Squared Differences

cindyforest7 — Tue, 14 Oct 2014 17:23:01 GMT

Hi all,

I have created a distance matrix using the following codes:

proc distance data=C02 out=dist method=Euclid;

var interval (pass_rate);

id contract_id;

run;

The distance metric is simply an absolute value of the difference between two pass rates. Now I want to square the difference for each single cell in the matrix, how I can do that?

Any input will be appreciated.

Thanks,

Re: Creating a Distance Matrix using Squared Differences

stat_sas — Tue, 14 Oct 2014 17:51:17 GMT

proc sql;
select distinct contract_id into :c separated by ' ' from dist;
quit;

data want;
set dist;
array ct{*} &c;
do i=1 to dim(ct);
ct{i}=(ct{i})**2;
end;
run;

proc print data=want;
run;

Re: Creating a Distance Matrix using Squared Differences

PGStats — Tue, 14 Oct 2014 18:50:00 GMT

In SAS 9.4 at least, you can ask for METHOD=SQEUCLID to get squared distances. - PG