W x j   = ℐ j  W ′  x j   = ℐ j  ln ⁡ ( f x j    p x     )        ( 3 )    MathType@MTEF@5@5@+=feaafiart1ev1aaatCvAUfKttLearuWrP9MDH5MBPbIqV92AaeXatLxBI9gBamrtHrhAL1wy0L2yHvtyaeHbnfgDOvwBHrxAJfwnaebbnrfifHhDYfgasaacH8akY=wiFfYdH8Gipec8Eeeu0xXdbba9frFj0=OqFfea0dXdd9vqai=hGuQ8kuc9pgc9s8qqaq=dirpe0xb9q8qiLsFr0=vr0=vr0dc8meaabaqaciaacaGaaeqabaWaaeGaeaaakeaaimaacqWFwe=vdaWgaaWcbaGaemiEaGNaemOAaOgabeaakiabg2da9iab=brijnaaBaaaleaacqWGQbGAaeqaaOGaf8NfXFLbauaadaWgaaWcbaGaemiEaGNaemOAaOgabeaakiabg2da9iab=brijnaaBaaaleaacqWGQbGAaeqaaOGagiiBaWMaeiOBa42aaeWaaeaadaWcaaqaaiabdAgaMnaaBaaaleaacqWG4baEcqWGQbGAaeqaaaGcbaGaemiCaa3aaSbaaSqaaiabdIha4bqabaaaaaGccaGLOaGaayzkaaGaaCzcaiaaxMaadaqadaqaaiabiodaZaGaayjkaiaawMcaaaaa@571D@