▁who ▁agreed ▁to ▁particip ate ▁in ▁the ▁Harris ▁Inter active ▁online ▁research ▁panel , ▁so ▁no ▁estimates ▁of ▁theoretical ▁sampling ▁error ▁can ▁be ▁calculated . ▁Possible ▁errors ▁in ▁the ▁collection ▁and ▁analysis ▁of ▁the ▁data ▁used ▁in ▁the ▁Employee ▁Conf idence ▁Index ▁include ▁sampling ▁error , ▁coverage ▁error , ▁error ▁associated ▁with ▁non response , ▁error ▁associated ▁with ▁question ▁word ing ▁and ▁response ▁options , ▁and ▁associated ▁post - sur vey ▁weight ing ▁and ▁adjust ment ▁errors . ▁Therefore , ▁Harris ▁Inter active ▁avoid s ▁calculating ▁a ▁margin ▁of ▁error ▁for ▁the ▁Index ▁as ▁it ▁would ▁be ▁mis leading . ▁All ▁that ▁can ▁be ▁calculated ▁are ▁different ▁possible ▁sampling ▁errors ▁with ▁different ▁prob abilities ▁based ▁on ▁pure , ▁un weight ed , ▁random ▁samples ▁with ▁ 1 0 0 % ▁response ▁rates . ▁These ▁are ▁only ▁theoretical ▁because ▁no ▁published ▁pol ls ▁come ▁close ▁to ▁this ▁ideal . ▁G lass door ▁and ▁other ▁employee ▁confidence ▁publications ▁use ▁Harris ▁Inter active ▁to ▁collect ▁and ▁compile ▁their ▁results ▁as ▁well ▁so ▁these ▁survey ▁conditions ▁are ▁rep licated ▁across ▁much ▁of ▁the ▁industry . ▁The ▁Cons umer ▁Conf idence ▁Index ▁published ▁by ▁the ▁Conference ▁Board ▁closely ▁follows ▁the ▁method ology ▁used ▁by ▁the ▁United ▁States ▁Census . ▁ ▁App lications ▁ ▁The ▁work force ▁data ▁that ▁the ▁Index ▁revel s ▁has ▁been ▁available ▁online ▁since ▁ 2 0 0 4 , ▁and ▁is ▁used ▁by ▁industry ▁publications , ▁news ▁companies , ▁h iring ▁man agers , ▁employees , ▁and ▁students . ▁The ▁index ▁can ▁also ▁be