Included in the embodiments, is {TAIL ~ a method} for realizing a storage efficient solution of {HEAD ~ the least squares calculation} 
Included in the embodiments , is { TAIL ~ a method } for realizing a storage efficient solution of { HEAD ~ the least squares calculation }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD