ﺛﺮ ﺗﺪوﯾﻦ اﺳﺘﺎﻧﺪارد و ﻣﻘﺮراتﮔﺬاري ﺑﺮ ﺳﻄﺢ اﻓﺸﺎ و ﻋﻤﻠﮑﺮد در ﺷﺮﮐﺘﻬﺎي ﭘﺬﯾﺮﻓﺘﻪ ﺷﺪه در ﺑﻮرس اوراق ﺑﻬﺎدار ﺗﻬﺮان ﺑﺎ اﺳﺘﻔﺎده از ﺳﯿﺴﺘﻢ ﻣﻌﺎدﻻت ﻫﻤﺰﻣﺎن اراﺋﻪ ﻣﺪﻟﯽ ﺟﺎﻣﻊ ﺟﻬﺖ اﻧﺪازه ﮔﯿﺮي ﺳﻄﺢ اﻓﺸﺎ(

اﯾﻦ ﭘﮋوﻫﺶ راﺑﻄﻪ ﺳﻄﺢ اﻓﺸﺎي اﻃﻼﻋﺎت ﺑﺎ ﻋﻤﻠﮑﺮد ﻣﺒﺘﻨﯽ ﺑﺮ ﺣﺴﺎﺑﺪاري و ﺑﺎزار در دوره ﻗﺒﻞ و ﺑﻌﺪ از ﺗﺪوﯾﻦ اﺳﺘﺎﻧﺪارد و ﻣﻘﺮرات-ﮔﺬاري را ﮔﺰارش ﻣﯽﮐﻨﺪ. در زﻣﯿﻨﻪ ارﺗﺒﺎط ﺑﯿﻦ ﺳﻄﺢ اﻓﺸﺎ و ﻋﻤﻠﮑﺮد ﺷﺮﮐﺖﻫﺎ، در ﻣﻄﺎﻟﻌﺎت اﻧﺠﺎم ﮔﺮﻓﺘﻪ دوﮔﺎﻧﮕﯽ دﯾﺪه ﻣﯽ ﺷﻮد؛ در ﺣﺎﻟﯿﮑﻪ ﺑﺮﺧﯽ از ﻣﻄﺎﻟﻌﺎت ﺗﺎﺛﯿﺮ ﺳﻄﺢ اﻓﺸﺎ ﺑﺮ ﻋﻤﻠﮑﺮد ﺷﺮﮐﺖﻫﺎ را ﻧﺸﺎن ﻣﯽدﻫﻨﺪ، ﻣﻄﺎﻟﻌﺎت دﯾﮕﺮي ﻧﯿﺰ وﺟﻮد دارد ﮐﻪ ﺗﺎﺛﯿﺮ ﻋﻤﻠﮑﺮد ﺷﺮﮐﺖﻫﺎ ﺑﺮ ﺳﻄﺢ اﻓﺸﺎ را آزﻣﻮن ﮐﺮدهاﻧﺪ. ﻣﺸﺎﻫﺪه ﺷﻮاﻫﺪي ﻣﺒﻨﯽ ﺑﺮ ﺻﺤﺖ ﻫﺮ دو روﯾﮑﺮد ﻣﺬﮐﻮر، ﻣﯽﺗﻮاﻧﺪ ﺑﻪ ﻣﻌﻨﺎي راﺑﻄﻪاي دوﻃﺮﻓﻪ ﻣﯿﺎن اﯾﻦ دو ﻣﺘﻐﯿﺮ ﺑﺎﺷﺪ. در اﯾﻦ راﺳﺘﺎ، ﭘﮋوﻫﺶ ﭘﯿﺶ رو ﺑﻪ ﺑﺮرﺳﯽ راﺑﻄﻪ دوﻃﺮﻓﻪ ﺳﻄﺢ اﻓﺸﺎي اﻃﻼﻋﺎت و ﻋﻤﻠﮑﺮد 66 ﺷﺮﮐﺖ ﭘﺬﯾﺮﻓﺘﻪ ﺷﺪه در ﺑﻮرس اوراق ﺑﻬﺎدار ﺗﻬﺮان در ﺑﺎزه زﻣﺎﻧﯽ 1379-1377و 1392-1387 ﻣﯽﭘﺮدازد. ﺳﭙﺲ ﺳﯿﺴﺘﻢ ﻣﻌﺎدﻻت ﻫﻤﺰﻣﺎن ﺑﺎ اﺳﺘﻔﺎده از روش رﮔﺮﺳﯿﻮن دوﻣﺮﺣﻠﻪاي ﺑﺮآورد ﮔﺮدﯾﺪ. ﻧﺘﺎﯾﺞ ﺑﺮآورد ﺣﺎﮐﯽ از وﺟﻮد راﺑﻄﻪ دوﻃﺮﻓﻪ ﺑﯿﻦ ﺳﻄﺢ اﻓﺸﺎ و ﻋﻤﻠﮑﺮد ﻣﺒﺘﻨﯽ ﺑﺮ ﺣﺴﺎﺑﺪاري و ﺑﺎزار ﺷﺮﮐﺖﻫﺎي ﭘﺬﯾﺮﻓﺘﻪ ﺷﺪه در ﺑﻮرس اوراق ﺑﻬﺎدار ﺗﻬﺮان در دوره ﻗﺒﻞ و ﺑﻌﺪ از ﺗﺪوﯾﻦ اﺳﺘﺎﻧﺪارد و ﻣﻘﺮراتﮔﺬاري اﺳﺖ. ﻫﻤﭽﻨﯿﻦ ﺑﻌﺪ از ﺗﺪوﯾﻦ اﺳﺘﺎﻧﺪاردﻫﺎ و ﻣﻘﺮراتﮔﺬاري، راﺑﻄﻪ اﻓﺸﺎ و ﻋﻤﻠﮑﺮد ﻧﯿﺰ ﺗﻔﺎوت ﻣﻌﻨﯽداري ﻧﺴﺒﺖ ﺑﻪ دوره ﻗﺒﻞ از آن ﭘﯿﺪا ﮐﺮده است

This study reports of the relationship disclosure and Accounting-based performance and Market-based performance before and after important changes in economic and accounting regulation. The so far studies ،reveal a dual relationship between disclosure quality and firm performance. While some studies have examined the effects of level of disclosure on firm performance ،other studies have examined the effects of firm performance on level of disclosure. Reviewing the evidence of the validity of both approaches means that there is a bilateral (two-sided) relationship between these two variables. In this regard ،the goal of present research is to study the bilateral relationship between level of disclosure and performance of 66 companies listed on Tehran Stock Exchange (TSE) during 1998 to 2000 and 2008 to 2013.then simultaneous equations system was estimated using two-step regression. Based on the results ،there is bilateral relationship between level of disclosure and Accounting-based performance and Market-based performance of the companies listed on the TSE before and after Iimportant Changes in Economic and Accounting regulation.also increase relationship between level of disclosure and performance after Iimportant Changes in Economic and Accounting regulation.