“ANYDATE” INFORMATS

http://www.lexjansen.com/wuss/2006/SAS_essentials/ESS-Carroll.pdf
“ANYDATE” INFORMATS
Sometimes you are very lucky in that the raw data you receive contains dates that are the same format. Sometimes you will encounter a messy data file where the dates are all different types of formats. The “anydate” informats are designed to allow you to read in a variety of date forms including:
• DATE, DATETIME, and TIME
• DDMMYY, MMDDYY, and YYMMDD
• JULIAN, MONYY, and YYQ

Using the anydate informats can be particularly useful when you are reading in data that contains a mixture of date forms and you want certain parts of the dates you are reading in. Anydate informats include:
• ANYDTDTE. Extracts the date portion
• ANYDTDTM. Extracts the datetime portion
• ANYDTTME. Extracts the time portion

Personalized Medicine: A Discussion

http://blogs.forbes.com/matthewherper/2011/02/25/personalized-medicine-a-discussion/

regular expression in SAS

www2.sas.com/proceedings/sugi29/265-29.pdf

R code to show UU' != I

U matrix as in SVD X=UDV' is only column orthogonal but not necessarily row orthogonal. U matrix, a N by p matrix, does not contain all the eigenvectors of XX', but only the first p vectors. X is also a N by p matrix, and XX' may have as many as N eigenvectors.