But Scott Zeger, the head of the department of biostatistics at Johns Hopkins, who performed the statistical analysis in the study, points out that clustered sampling is the rule rather than the exception in public-health studies, and that the patterns of deaths caused by epidemics are also very variable by location.
Hundreds of parameters were considered by each of the, variable such as site (forbes.com in our case), your geo-location, browser language, internet connection speed, browser type, along with hundreds of other data point come into play.