Data values for the set of metrics for the field web sites can also be obtained from other publicly available information/sources in the web, such a from {HEAD ~ public ad placement keyword suggestion tools} for {TAIL ~ search engines}, by way of example 
for
Data values for the set of metrics for the field web sites can also be obtained from other publicly available information / sources in the web , such a from { HEAD ~ public ad placement keyword suggestion tools } for { TAIL ~ search engines } , by way of example
OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH