Variations in differences between target web site data values and corresponding average and bounding web site data values over time determines {HEAD ~ improvement} and success of {TAIL ~ the target web site} 
of
Variations in differences between target web site data values and corresponding average and bounding web site data values over time determines { HEAD ~ improvement } and success of { TAIL ~ the target web site }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL