topic Re: what kind of method is is using the Fastknn procedure? in SAS Procedures

what kind of method is is using the Fastknn procedure?

Hansdewit — Tue, 06 Aug 2019 13:04:15 GMT

I am using for project now the procedure Fastknn.

i can choose as method=APPROXIMATE | EXACT.

But the documentation doesn't describe which method it use. like as in proc distance. so my question is which distance method is Fastknn is using.

exampple:

Euclidean distance, Squared Euclidean distance, shape distance, chebychev

Re: what kind of method is is using the Fastknn procedure?

JosvanderVelden — Fri, 09 Aug 2019 10:04:53 GMT

The fastknn procedure uses euclidean distance. It is mentioned in the documentation here: https://documentation.sas.com/?docsetId=casml&docsetTarget=casml_fastknn_overview.htm&docsetVersion=8.4&locale=en

Re: what kind of method is is using the Fastknn procedure?

Hansdewit — Fri, 09 Aug 2019 11:23:05 GMT

my colleague told me as well. it was mentioned in Details of documentations. sorryabout.

P.S. Proc Fastknn is incredible fast. the procedure create for me a dataset of 159 billion rows with the distnance and make the decision of which is the nearest in only 900 seconds.