Bulletin – March 2016 Equation

( X ¯ i,t X ¯ i,2008 ) β ^ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaeWaaeaada qdaaqaaiaadIfaaaWaa0baaSqaaiaadMgacaGGSaGaamiDaaqaamXv P5gsLjMCLDharyGtHj3APnxATbacfaGae8xgGijaaOGaeyOeI0Yaa0 aaaeaacaWGybaaamaaDaaaleaacaWGPbGaaiilaiaaikdacaaIWaGa aGimaiaaiIdaaeaacqWFzaIKaaaakiaawIcacaGLPaaacuaHYoGyga qcaaaa@4D2E@