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</div><div class="MsoNormal">Obrigado pela resposta Walmes, foi bem esclarecedora (demorei a responder porque estava sem net).</div><div class="MsoNormal"><br></div><div class="MsoNormal">At<br>
</div>
<br>Gustavo <br>
<div><br></div> <div style="font-family: times new roman, new york, times, serif; font-size: 10pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <font face="Arial" size="2"> <hr size="1"> <b><span style="font-weight:bold;">De:</span></b> Walmes Zeviani <walmeszeviani@gmail.com><br> <b><span style="font-weight: bold;">Para:</span></b> r-br@listas.c3sl.ufpr.br; Gustavo Marcatti <vgp.gustavo@yahoo.com.br> <br> <b><span style="font-weight: bold;">Enviadas:</span></b> Terça-feira, 24 de Janeiro de 2012 13:26<br> <b><span style="font-weight: bold;">Assunto:</span></b> Re: [R-br] [OFF-TOPIC] Superfície de resposta<br> </font> </div> <br><meta http-equiv="x-dns-prefetch-control" content="off"><div id="yiv67071578"><font face="trebuchet ms,sans-serif">O que se considera é que os valores das (co)variáveis independentes sejam tratados como fixo, independente de terem sido determinadas pelo
pesquisados (como doses) ou valores ocorridos na amostra (caso altura em função de peso numa amostra de pessoas). Nos modelos sempre estamos interessados na distribuição de Y|x, ou seja, respostas condicionais aos valores observados das covariáveis. Então x pode ser um conjunto de variáveis aleatórias, mas nos modelos de regressão (inclui modelos de experimento e superfície de resposta) estamos tratando como fixo e querendo saber qual E(Y|x). Casos em que x é tratado como v.a. são as técnicas multivariadas, aí se fala da distribuição conjunta das v.a., e não de Y condicional à x.<br>
<br>À disposição.<br>Walmes.<br><br clear="all"></font><span style="font-family:trebuchet ms, sans-serif;">==========================================================================</span><br style="font-family:trebuchet ms, sans-serif;">
<span style="font-family:trebuchet ms, sans-serif;">Walmes Marques Zeviani</span><br style="font-family:trebuchet ms, sans-serif;"><span style="font-family:trebuchet ms, sans-serif;">LEG (Laboratório de Estatística e Geoinformação, 25.450418 S, 49.231759 W)</span><br style="font-family:trebuchet ms, sans-serif;">
<span style="font-family:trebuchet ms, sans-serif;">Departamento de Estatística - Universidade Federal do Paraná</span><br style="font-family:trebuchet ms, sans-serif;"><span style="font-family:trebuchet ms, sans-serif;">fone: (+55) 41 3361 3573</span><br style="font-family:trebuchet ms, sans-serif;">
<span style="font-family:trebuchet ms, sans-serif;">VoIP: (3361 3600) 1053 1173</span><br style="font-family:trebuchet ms, sans-serif;"><span style="font-family:trebuchet ms, sans-serif;">e-mail: <a rel="nofollow" ymailto="mailto:walmes@ufpr.br" target="_blank" href="mailto:walmes@ufpr.br">walmes@ufpr.br</a></span><br style="font-family:trebuchet ms, sans-serif;">
<span style="font-family:trebuchet ms, sans-serif;">twitter: @walmeszeviani</span><br style="font-family:trebuchet ms, sans-serif;"><span style="font-family:trebuchet ms, sans-serif;">homepage: <a rel="nofollow" target="_blank" href="http://www.leg.ufpr.br/%7Ewalmes">http://www.leg.ufpr.br/~walmes</a></span><br style="font-family:trebuchet ms, sans-serif;">
<span style="font-family:trebuchet ms, sans-serif;">linux user number: 531218</span><br style="font-family:trebuchet ms, sans-serif;"><span style="font-family:trebuchet ms, sans-serif;">==========================================================================</span><br>
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