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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Desempenho de analistas sell-side no mercado de a??es brasileiro

Lima J?nior, Melquiades Pereira de 12 December 2014 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-01T21:25:41Z No. of bitstreams: 1 MelquiadesPereiraDeLimaJunior_TESE.pdf: 1014796 bytes, checksum: 8ce87a88d5871d6d3df9340f8239cdf0 (MD5) / Approved for entry into archive by Elisangela Moura (lilaalves@gmail.com) on 2016-02-01T23:58:30Z (GMT) No. of bitstreams: 1 MelquiadesPereiraDeLimaJunior_TESE.pdf: 1014796 bytes, checksum: 8ce87a88d5871d6d3df9340f8239cdf0 (MD5) / Made available in DSpace on 2016-02-01T23:58:30Z (GMT). No. of bitstreams: 1 MelquiadesPereiraDeLimaJunior_TESE.pdf: 1014796 bytes, checksum: 8ce87a88d5871d6d3df9340f8239cdf0 (MD5) Previous issue date: 2014-12-12 / O objetivo desta pesquisa foi analisar o comportamento de analistas Sell-Side e propor uma classifica??o de analistas, considerando o desempenho das previs?es de pre?os e reco- menda??es (vender-manter-comprar) no mercado de a??es brasileiro. Para isso, o primeiro passo foi analisar o consenso dos analistas para entender a import?ncia dessa medida co- letiva no mercado; o segundo foi analisar os analistas individualmente para compreender como melhoram suas an?lises no tempo. Terceiro foi compreender como s?o as principais metodologias de classifica??o utilizadas em mercados mundiais. Por ?ltimo, propor uma forma de classifica??o que possa refletir os aspectos anteriores discutidos. Para investigar as hip?teses propostas no estudo foram utilizados modelos lineares em painel, para cap- tar elementos no tempo. Os dados das previs?es de pre?os e recomenda??es de analistas individualmente e em consenso, no per?odo de 2005 a 2013 foram obtidos da plataforma Bloomberg. Os principais resultados foram: (i) desempenho superior das previs?es e recomenda??es do consenso, em compara??o com as an?lises individuais; (ii) a associa??o do n?mero de analistas emitindo recomenda??es com a melhoria da acur?cia possibilita supor que esse quantitativo pode estar associado ao aumento da for?a do consenso e, consequentemente, a acur?cia; (iii) o efeito de ancoragem dos analistas nas revis?es do consenso faz com que suas previs?es sejam viesadas, sobreavaliando os ativos; (iv) os analistas necessitam ter maior cautela em momentos de turbul?ncia econ?mica, obser- vando tamb?m mercados externos como o norte-americano. Pois, essas varia??es podem provocar altera??es nos vieses entre otimismo e pessimismo; (v) efeitos provenientes de mudan?as no vi?s, como o aumento do pessimismo, podem provocar o aumento excessivo do n?mero de recomenda??es de compra. Nesse caso, os analistas podem devem ter mais cautela na realiza??o das an?lises, principalmente na coer?ncia entre a recomenda??o e o pre?o previsto; (vi) a experi?ncia do analista com o setor econ?mico do ativo e com o ativo contribui para a melhoria das previs?es, por?m, a experi?ncia geral mostrou ind?cios contr?rios; (vii) o otimismo associado a essa experi?ncia geral, com o passar do tempo, mostra um comportamento semelhante a um excesso de confian?a, podendo provocar re- du??o da acur?cia; (viii) o efeito conflitante da experi?ncia geral entre a acur?cia e o retorno observado mostra ind?cios de que, com o passar do tempo, o analista apresenta efeitos semelhantes ao de apego sobre o ativo, o que acarretaria em uma an?lise conflitu- osa entre recomenda??es e previs?es; (ix) apesar do foco em menos setores contribuir para a qualidade da acur?cia, o mesmo n?o ocorre com o foco em ativos. Ent?o, ? poss?vel que os analistas possam ter ganhos de escala quando cobrem mais ativos dentro do mesmo setor; e por ?ltimo, (x) foi poss?vel elaborar uma proposta de classifica??o de analistas que pondere tanto retornos como a consist?ncia dessas previs?es, chamado de Coeficiente de An?lise. Esse ranking resultou melhores resultados, considerando o retorno/desvio Padr?o. / The purpose of this study was to analyze the behavior of Sell-Side analysts and analysts propose a classification, considering the performance of the price forecasts and recom- mendations (sell-hold-buy) in the Brazilian stock market. For this, the first step was to analyze the consensus of analysts to understand the importance of this collective interven- tion in the market; the second was to analyze the analysts individually to understand how improve their analysis in time. Third was to understand how are the main methods of ranking used in markets. Finally, propose a form of classification that reflects the previous aspects discussed. To investigate the hypotheses proposed in the study were used linear models for panel to capture elements in time. The data of price forecasts and analyst recommendations individually and consensus, in the period 2005-2013 were obtained from Bloomberg R ? . The main results were: (i) superior performance of consensus recommen- dations, compared with the individual analyzes; (ii) associating the number of analysts issuing recommendations with improved accuracy allows supposing that this number may be associated with increased consensus strength and hence accuracy; (iii) the anchoring effect of the analysts consensus revisions makes his predictions are biased, overvaluating the assets; (iv) analysts need to have greater caution in times of economic turbulence, noting also foreign markets such as the USA. For these may result changes in bias between optimism and pessimism; (v) effects due to changes in bias, as increased pessimism can cause excessive increase in purchase recommendations number. In this case, analysts can should be more cautious in analysis, mainly for consistency between recommendation and the expected price; (vi) the experience of the analyst with the asset economic sector and the asset contributes to the improvement of forecasts, however, the overall experience showed opposite evidence; (vii) the optimism associated with the overall experience, over time, shows a similar behavior to an excess of confidence, which could cause reduction of accuracy; (viii) the conflicting effect of general experience between the accuracy and the observed return shows evidence that, over time, the analyst has effects similar to the endowment bias on assets, which would result in a conflict analysis of recommendations and forecasts ; (ix) despite the focus on fewer sectors contribute to the quality of accuracy, the same does not occur with the focus on assets. So it is possible that analysts may have economies of scale when cover more assets within the same industry; and finally, (x) was possible to develop a proposal for classification analysts to consider both returns and the consistency of these predictions, called Analysis coefficient. This ranking resulted better results, considering the return / standard deviation.

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