all ized ▁knowledge , ▁while ▁more ▁applied , ▁could ▁be ▁maintained ▁or ▁even ▁increase ▁after ▁fluid ▁ability ▁begins ▁to ▁decl ine ▁with ▁age , ▁a ▁concept ▁used ▁in ▁the ▁National ▁Ad ult ▁Reading ▁Test ▁( N ART ). ▁C att ell ▁constructed ▁a ▁number ▁of ▁ability ▁tests , ▁including ▁the ▁Com pre h ensive ▁Ab ility ▁B atter y ▁( C AB ) ▁that ▁provides ▁measures ▁of ▁ 2 0 ▁primary ▁ab ilities , ▁and ▁the ▁Culture ▁Fair ▁Int elligence ▁Test ▁( CF IT ) ▁which ▁was ▁designed ▁to ▁provide ▁a ▁completely ▁non - ver bal ▁measure ▁of ▁intelligence ▁like ▁that ▁now ▁seen ▁in ▁the ▁R aven ' s . ▁The ▁Culture ▁Fair ▁Int elligence ▁S cal es ▁were ▁intended ▁to ▁minim ize ▁the ▁influence ▁of ▁cultural ▁or ▁educational ▁background ▁on ▁the ▁results ▁of ▁intelligence ▁tests . ▁ ▁In ▁regard ▁to ▁statistical ▁method ology , ▁in ▁ 1 9 6 0 ▁C att ell ▁founded ▁the ▁Society ▁of ▁Mult ivari ate ▁Ex perimental ▁Psych ology ▁( S ME P ), ▁and ▁its ▁journal ▁Mult ivari ate ▁Be havior al ▁Research , ▁in ▁order ▁to ▁bring ▁together , ▁encou rage , ▁and ▁support ▁scient ists ▁interested ▁in ▁multi - vari ate ▁research . ▁He ▁was ▁an ▁early ▁and ▁frequent ▁user ▁of ▁factor ▁analysis ▁( a ▁statistical ▁procedure ▁for ▁finding ▁underlying ▁factors ▁in ▁data ). ▁C att ell ▁also ▁developed ▁new ▁factor ▁analyt ic ▁techniques , ▁for ▁example , ▁by ▁invent ing ▁the ▁sc ree ▁test , ▁which ▁uses ▁the ▁curve ▁of ▁lat ent ▁roots