Made available in DSpace on 2015-12-03T18:35:21Z (GMT). No. of bitstreams: 1 Tiago_Morais_de_Castro.pdf: 1342136 bytes, checksum: bf015b66106a0b404f6f9a7b695bbf36 (MD5) Previous issue date: 2012-04-20 / The study of the relevance of accounting information has come to prominence with the development of capital markets and the pursuit of timely information, quality and which are able to influence its users. As relevant accounting information, this essay adopts the concept of quality that the information owns to influence prices in the capital markets. Taking advantage of the timely convergence of brazilian accounting standards to IFRS (International Financial Reports Standards), this study aimed to determine whether the adoption of international accounting standards (IFRS) affected the relevance of accounting information of non-financial companies listed in Brazil and whether there are differences in the relevance of accounting information among the published statement sunder IFRS on a voluntary and compulsory way. The first objective examined whether there were differences in the relevance of the information through an analysis of ordinary least squares (OLS) of the financial statements of 2009 prepared in BR GAAP and IFRS, and through the analysis of panel data from the annual financial statements period 2005 to 2010. The second objective of the analysis used panel data from annual financial statements for the period 2005 to 2010, and considered as those published in voluntary IFRS for prior periods to fiscal the year of 2010. All analyzes used models of Ohlson (1995) and Barth, Cram and Nelson (2001). The models were used as dependent variables price (P) and stock returns (RET), however the results were suitable only to the dependent variable (P). The analysis indicated that there are differences in the relevance of the information of non-financial companies listed in Brazil, on its financial statements prepared in BR GAAP and IFRS. The analysis of the model of Ohlson (1995) in OLS and panel data confirmed this difference and pointed to the financial statements prepared under IFRS as the major importance. The model of Barth, Cram and Nelson (2001) in OLS also revealed differences in the relevance of the information prepared in BR GAAP and IFRS, but pointed to statements in BR GAAP as the major importance. The model of Barth, Cram and Nelson (2001) on panel data found no differences in the relevance of accounting information between BR GAAP and IFRS standards. The second objective, the results indicate that there are no differences in the relevance of accounting information between the statements prepared under IFRS on a mandatory or voluntary way, from non-financial companies listed in Brazil / O estudo da relev??ncia das informa????es cont??beis vem ganhando destaque com o desenvolvimento dos mercados de capitais e com a busca de informa????es tempestivas, de qualidade e que sejam capazes de influenciar seus usu??rios. Como informa????o cont??bil relevante, esta disserta????o adota o conceito da qualidade que a informa????o possui de influenciar os pre??os praticados nos mercados de capitais. Aproveitando o momento oportuno da converg??ncia das normas cont??beis brasileiras para as IFRS (International Financial Reports Standards), este trabalho teve por objetivo verificar se a ado????o das normas internacionais de contabilidade (IFRS) afetou a relev??ncia das informa????es cont??beis das empresas n??o financeiras listadas no Brasil e se existe diferen??a na relev??ncia das informa????es cont??beis entre as demonstra????es publicadas em IFRS de forma volunt??ria e obrigat??ria. O primeiro objetivo verificou se haviam diferen??as na relev??ncia das informa????es atrav??s de uma an??lise em M??nimos Quadrados Ordin??rios (MQO) das demonstra????es cont??beis do ano de 2009 elaboradas em BR GAAP e em IFRS; e atrav??s da an??lise de dados em painel das demonstra????es cont??beis anuais do per??odo de 2005 a 2010. O segundo objetivo utilizou da an??lise de dados em painel das demonstra????es cont??beis anuais do per??odo de 2005 a 2010, e considerou como demonstra????o cont??bil volunt??ria aquelas publicadas em IFRS para per??odos anteriores ao exerc??cio 2010. Todas as an??lises utilizaram dos modelos de Ohlson (1995) e Barth, Cram e Nelson (2001). Os modelos utilizados tinham como vari??veis dependentes o pre??o (P) e o retorno das a????es (RET), por??m, os resultados foram adequados somente com a vari??vel dependente (P). As an??lises apontaram que existem diferen??as na relev??ncia das informa????es das empresas n??o financeiras listadas no Brasil, relativo ?? suas demonstra????es cont??beis elaboradas em BR GAAP e em IFRS. A an??lise do modelo de Ohlson (1995) em MQO e dados em painel comprovaram esta diferen??a e apontaram paras as demonstra????es elaboradas em IFRS como as de maior relev??ncia. O modelo de Barth, Cram e Nelson (2001) em MQO tamb??m revelou diferen??as na relev??ncia das informa????es elaboradas em BR GAAP e IFRS, por??m apontou para as demonstra????es em BR GAAP como de maior relev??ncia. O modelo de Barth, Cram e Nelson (2001) em dados de painel n??o encontrou diferen??as na relev??ncia das informa????es cont??beis entre os padr??es BR GAAP e IFRS. Quanto ao segundo objetivo, os resultados apontam que n??o existem diferen??as na relev??ncia das informa????es cont??beis entre as demonstra????es elaboradas em IFRS de forma obrigat??ria ou volunt??ria, das empresas n??o financeiras listadas no Brasil