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<body><div style="font-family:Arial;">Acredito já ter citado estudo mencionando que os intervalos de confiança da tração de prevalência com a regressão Poisson ficam excessivamente estreitos. No SAS e no Stata a solução mais facilmente acessível é a estimação sanduíche da variância, mas no R a solução mais fácil é usar a distribuição quasi-Poisson.</div>
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<div id="sig4487139"><div id="signature" class="signature"><a href="http://lattes.cnpq.br/9234772336296638" title="Currículo Lattes">Leonardo Ferreira Fontenelle</a><br></div>
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<div>Em Sex 22 abr. 2016, às 09:54, Emerson Cotta Bodevan escreveu:<br></div>
<blockquote type="cite"><div dir="ltr"><div><div><div><div style="font-family:Arial;">Oi Mauricio, bom dia.<br></div>
</div>
<div style="font-family:Arial;">Era isso mesmo. Mudando para 0 e 1, rodou perfeitamente.<br></div>
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<div style="font-family:Arial;">Muito obrigado a todos que ajudaram de alguma forma.<br></div>
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<div style="font-family:Arial;">Att.,<br></div>
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<div><div style="font-family:Arial;"> </div>
<div><div><div dir="ltr"><div style="font-family:Arial;"> </div>
<div style="text-align:left;"><i><b>Emerson</b></i><br></div>
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<div defang_data-gmailquote="yes"><div style="font-family:Arial;">Em 21 de abril de 2016 18:01, Mauricio Cardeal <span dir="ltr"><<a href="mailto:mcardeal2010@gmail.com">mcardeal2010@gmail.com</a>></span> escreveu:<br></div>
<blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex;" defang_data-gmailquote="yes"><div bgcolor="#FFFFFF"><div style="font-family:Arial;">Emerson, tente colocar a variável dependente como numérica e com
    códigos numéricos 1 e 0. <br></div>
<div style="font-family:Arial;"><span><span class="colour" style="color:rgb(136, 136, 136)"> Mauricio Cardeal<br> UFBA</span></span></div>
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<div>Em 19/04/2016 22:00, Emerson Cotta
      Bodevan escreveu:<br></div>
<blockquote type="cite"><div dir="ltr"><div><div><div><div><div><div><div><div><div style="font-family:Arial;">Prezados...<br></div>
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<div style="font-family:Arial;">Executei o comando sugerido pelo Mauricio<br></div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> <b>mod1<-glm(PoliFar~ClassEco+Educ,family="poisson"(link="log"),data=dmha2)</b><br></div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> e estou encontrando a seguinte mensagem de erro<br></div>
<div style="font-family:Arial;"> <b><br> Error in if (any(y < 0)) stop("negative
                        values not allowed for the 'Poisson' family") :
                        valor ausente onde TRUE/FALSE necessário<br> Além disso: Warning message:<br> In Ops.factor(y, 0) : ‘<’ not meaningful for
                        factors</b></div>
<div style="font-family:Arial;"> </div>
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<div style="font-family:Arial;">Meus dados estão no seguinte formato: (<b>data frame
                    dmha2</b>):<br></div>
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</div>
<div style="font-family:Arial;"><b>ClassEco     Educ     PoliFar</b><br></div>
</div>
<div style="font-family:Arial;"><b>A                 0-2         S</b><br></div>
</div>
<div style="font-family:Arial;"><b>D-E              3-5         N<br> B                 12+         S</b></div>
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<div><b>A                 6-8          S</b><br></div>
<div style="font-family:Arial;"><b>C                 9-11         N</b><br></div>
</div>
<div style="font-family:Arial;"><b>D-E              0-2          S<br> </b> </div>
<div><div><div><div><div><div style="font-family:Arial;"><b>...                 ...          ...</b><br></div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> Vocês sabem o que está errado?<br></div>
<div style="font-family:Arial;"> </div>
</div>
<div>Att.,<br></div>
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<div><div><div dir="ltr"><div style="font-family:Arial;"> </div>
<div style="text-align:left;"><i><b>Emerson</b></i><br></div>
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<div defang_data-gmailquote="yes"><div style="font-family:Arial;">Em 19 de abril de 2016 19:03, Emerson
          Cotta Bodevan <span dir="ltr"><<a href="mailto:bodevan.ec@gmail.com">bodevan.ec@gmail.com</a>></span> escreveu:<br></div>
<div style="font-family:Arial;"> </div>
<blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex;" defang_data-gmailquote="yes"><div dir="ltr"><div><div style="font-family:Arial;">Obrigado Mauricio.<br></div>
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<div><div style="font-family:Arial;">Vou executar aqui.<br></div>
<div style="font-family:Arial;"> </div>
</div>
<div>Att.,<br></div>
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<div><div style="font-family:Arial;"> </div>
<div><div><div dir="ltr"><div style="font-family:Arial;"> </div>
<div style="text-align:left;"><i><b>Emerson</b></i><br></div>
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<div defang_data-gmailquote="yes"><div style="font-family:Arial;">Em 19 de abril de 2016
                      19:01, Mauricio Cardeal <span dir="ltr"><<a href="mailto:mcardeal2010@gmail.com"></a><a href="mailto:mcardeal2010@gmail.com">mcardeal2010@gmail.com</a>></span> escreveu:<br></div>
<div style="font-family:Arial;"> </div>
<blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex;" defang_data-gmailquote="yes"><div bgcolor="#FFFFFF"><div style="font-family:Arial;">Emerson,
                          você pode tentar assim:<span><br> <br> modelo=glm(variavel dependente ~ variaveis
                            independentes,family="poisson"(link="log"))<br> exp(modelo$coefficients)<br> summary(modelo)<br> <br> </span> Para os intervalos de confiança use a
                          função confint:</div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> exp(confint(modelo)) # 95% CI for
                          exponentiated coefficients<span><span class="colour" style="color:rgb(136, 136, 136)"><br> <br> Mauricio Cardeal<br> UFBA</span></span> </div>
<div><div><div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> </div>
<div>Em 19/04/2016 18:37, Emerson Cotta
                                Bodevan escreveu:<br></div>
<blockquote type="cite"><div dir="ltr"><div><div><div><div><div style="font-family:Arial;">Olá Marco!<br></div>
<div style="font-family:Arial;"> </div>
</div>
<div style="font-family:Arial;">Obrigado pela dica. Depois de
                                        ler as referências e sugestões,
                                        vi que (apesar de minha resposta
                                        ser dicotômica) , como meu
                                        estudo é transversal, o melhor é
                                        usar a Regressão de Poisson com
                                        variância Robusta.<br></div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> </div>
</div>
<div style="font-family:Arial;">A dica do Maurício Cardeal.
                                      Agora... como construo o IC da
                                      Razão de Prevalência?<br></div>
<div style="font-family:Arial;"> </div>
</div>
<div style="font-family:Arial;"> </div>
</div>
<div style="font-family:Arial;">Agradeço a todos.<br></div>
<div style="font-family:Arial;"> </div>
</div>
<div><div style="font-family:Arial;"> </div>
<div><div><div dir="ltr"><div style="font-family:Arial;"> </div>
<div style="text-align:left;"><i><b>Emerson</b></i><br></div>
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</div>
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<div defang_data-gmailquote="yes"><div style="font-family:Arial;">Em 19 de
                                    abril de 2016 17:22, Marco Nunes <span dir="ltr"><<a href="mailto:nunes.ma@outlook.com"></a><a href="mailto:nunes.ma@outlook.com">nunes.ma@outlook.com</a>></span> escreveu:<br></div>
<div style="font-family:Arial;"> </div>
<blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex;" defang_data-gmailquote="yes"><div><div dir="ltr"><div style="font-family:Arial;">Olá Emerson<br></div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> O uso da razão de prevalência
                                          na regressão logística já foi
                                          reapondido.<br></div>
<div style="font-family:Arial;"> Para o cálculo de razão de
                                          prevalência (assim como risco
                                          relatico e razão de odds
                                          também) utilizo o pacote
                                          "epiR".<br></div>
<div style="font-family:Arial;"> Encaminho um tutorial abaixo.<br></div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> # Exemplo de utilização do
                                          epi.2by2 para calculo da razão
                                          de prevalencia<br></div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> library(epiR)<br></div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> dat <-
                                          matrix(c(13,2163,5,3349), nrow
                                          = 2, byrow = TRUE)<br></div>
<div style="font-family:Arial;"> rownames(dat) <- c("DF+",
                                          "DF-")<br></div>
<div style="font-family:Arial;"> colnames(dat) <- c("FUS+",
                                          "FUS-")<br></div>
<div style="font-family:Arial;"> dat<br></div>
<div style="font-family:Arial;"> epi.2by2(dat = as.table(dat),
                                          method = "cross.sectional",
                                          conf.level = 0.95, units =
                                          100,  homogeneity =
                                          "breslow.day", outcome =
                                          "as.columns")<br></div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> Prof. Dr. Marco Antonio Prado
                                          Nunes<br></div>
<div style="font-family:Arial;"> Departamento de Medicina/UFS<br></div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> </div>
<div><div style="font-family:Arial;"><hr>Date: Sat, 9 Apr 2016
                                            15:49:02 -0300<br></div>
<div style="font-family:Arial;"> From: <a href="mailto:bodevan.ec@gmail.com"></a><a href="mailto:bodevan.ec@gmail.com">bodevan.ec@gmail.com</a><br></div>
<div style="font-family:Arial;"> To: <a href="mailto:r-br@listas.c3sl.ufpr.br"></a><a href="mailto:r-br@listas.c3sl.ufpr.br">r-br@listas.c3sl.ufpr.br</a><br></div>
<div style="font-family:Arial;"> Subject: Re: [R-br] Razão de
                                            prevalência <br></div>
<div><div><div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> </div>
<div dir="ltr"><div><div><div style="font-family:Arial;">Obrigado César.<br></div>
<div style="font-family:Arial;"> </div>
</div>
<div style="font-family:Arial;">Vou verificar.<br></div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> </div>
</div>
<div style="font-family:Arial;">Abraço,<br></div>
<div style="font-family:Arial;"> </div>
</div>
<div><div style="font-family:Arial;"> </div>
<div><div><div dir="ltr"><div style="font-family:Arial;"> </div>
<div style="text-align:left;"><i><b>Emerson</b></i><br></div>
</div>
</div>
</div>
<div style="font-family:Arial;"> </div>
<div><div style="font-family:Arial;">Em 8 de abril de
                                                    2016 14:30, Cesar
                                                    Rabak <span dir="ltr"><<a href="mailto:cesar.rabak@gmail.com"></a><a href="mailto:cesar.rabak@gmail.com">cesar.rabak@gmail.com</a>></span> escreveu:<br></div>
<div style="font-family:Arial;"> </div>
<blockquote style="border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex;"><div dir="ltr"><div style="font-family:Arial;">Olá
                                                        Emerson, <br></div>
<div> </div>
<div>Embora a
                                                          referência
                                                          apresentada
                                                          pelo Leonardo
                                                          seja recente e
                                                          interessante,
                                                          pode acontecer
                                                          que devido a
                                                          exigências do
                                                          veículo que
                                                          você
                                                          publicará,
                                                          orientação ou
                                                          chefia, o
                                                          cálculo tenha
                                                          que seguir com
                                                          a RL regular
                                                          para os IC da
                                                          RP.<br></div>
<div> </div>
<div>Nesse caso,
                                                          recomendo a
                                                          leitura de um
                                                          artigo mais
                                                          "clássico" e
                                                          que tem boas
                                                          referências e
                                                          código e R: <a href="http://www.scielo.br/pdf/csp/v31n3/0102-311X-csp-31-03-00487.pdf"></a><a href="http://www.scielo.br/pdf/csp/v31n3/0102-311X-csp-31-03-00487.pdf">http://www.scielo.br/pdf/csp/v31n3/0102-311X-csp-31-03-00487.pdf</a><br></div>
<div> </div>
<div>HTH<br></div>
<div>--<br></div>
<div>Cesar Rabak<br></div>
</div>
<div><div style="font-family:Arial;"> </div>
<div><div><div>2016-04-07
                                                          15:21
                                                          GMT-03:00
                                                          Emerson Cotta
                                                          Bodevan <span dir="ltr"><<a href="mailto:bodevan.ec@gmail.com"></a><a href="mailto:bodevan.ec@gmail.com">bodevan.ec@gmail.com</a>></span>:<br></div>
</div>
<blockquote style="border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex;"><div><div><div dir="ltr"><div><div><div><div><div style="font-family:Arial;">Prezados,
                                                          boa tarde.<br></div>
<div style="font-family:Arial;"> </div>
</div>
<div style="font-family:Arial;">Estou usando
                                                          regressão
                                                          logística,
                                                          tendo como
                                                          resposta a
                                                          ocorrência ou
                                                          não de uma
                                                          doença comum
                                                          (alta
                                                          prevalência).<br></div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> </div>
</div>
<div style="font-family:Arial;">Como calcular
                                                          a<b>razão de
                                                          prevalência</b> e seus
                                                          intervalos de
                                                          confiança?
                                                          Estudo
                                                          transversal.<br></div>
<div style="font-family:Arial;"> </div>
</div>
<div style="font-family:Arial;">Algum pacote
                                                          adequado?<br></div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> </div>
</div>
<div style="font-family:Arial;">Agradeço
                                                          qualquer
                                                          ajuda.<span><span class="colour" style="color:rgb(136, 136, 136)"><br clear="all"> </span></span></div>
<div><div><div><div><div><div><div><div><div><div dir="ltr"><div style="font-family:Arial;"> </div>
<div style="text-align:left;"><span><span class="colour" style="color:rgb(136, 136, 136)"><i><b>Emerson</b></i></span></span><br></div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div style="font-family:Arial;"> </div>
</div>
<div style="font-family:Arial;"> </div>
</div>
</div>
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<div style="font-family:Arial;"> <a href="mailto:R-br@listas.c3sl.ufpr.br">R-br@listas.c3sl.ufpr.br</a><br></div>
<div style="font-family:Arial;"> <a href="https://listas.inf.ufpr.br/cgi-bin/mailman/listinfo/r-br">https://listas.inf.ufpr.br/cgi-bin/mailman/listinfo/r-br</a><br></div>
<div style="font-family:Arial;"> Leia o guia de postagem (<a href="http://www.leg.ufpr.br/r-br-guia"></a><a href="http://www.leg.ufpr.br/r-br-guia">http://www.leg.ufpr.br/r-br-guia</a>)
                                      e forneça código mínimo
                                      reproduzível.<br></div>
</blockquote></div>
<div style="font-family:Arial;"> </div>
</div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> </div>
<pre>_______________________________________________
R-br mailing list
<a href="mailto:R-br@listas.c3sl.ufpr.br">R-br@listas.c3sl.ufpr.br</a>
<a href="https://listas.inf.ufpr.br/cgi-bin/mailman/listinfo/r-br">https://listas.inf.ufpr.br/cgi-bin/mailman/listinfo/r-br</a>
Leia o guia de postagem (<a href="http://www.leg.ufpr.br/r-br-guia">http://www.leg.ufpr.br/r-br-guia</a>) e forne�a c�digo m�nimo reproduz�vel.<br></pre></blockquote><div style="font-family:Arial;"> </div>
</div>
</div>
</div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;">_______________________________________________<br></div>
<div style="font-family:Arial;"> R-br mailing list<br></div>
<div style="font-family:Arial;"> <a href="mailto:R-br@listas.c3sl.ufpr.br">R-br@listas.c3sl.ufpr.br</a><br></div>
<div style="font-family:Arial;"> <a href="https://listas.inf.ufpr.br/cgi-bin/mailman/listinfo/r-br">https://listas.inf.ufpr.br/cgi-bin/mailman/listinfo/r-br</a><br></div>
<div style="font-family:Arial;"> Leia o guia de postagem (<a href="http://www.leg.ufpr.br/r-br-guia"></a><a href="http://www.leg.ufpr.br/r-br-guia">http://www.leg.ufpr.br/r-br-guia</a>)
                        e forneça código mínimo reproduzível.<br></div>
</blockquote></div>
<div style="font-family:Arial;"> </div>
</div>
</div>
</div>
</div>
</blockquote></div>
<div style="font-family:Arial;"> </div>
</div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;"> </div>
<pre>_______________________________________________
R-br mailing list
<a href="mailto:R-br@listas.c3sl.ufpr.br">R-br@listas.c3sl.ufpr.br</a>
<a href="https://listas.inf.ufpr.br/cgi-bin/mailman/listinfo/r-br">https://listas.inf.ufpr.br/cgi-bin/mailman/listinfo/r-br</a>
Leia o guia de postagem (<a href="http://www.leg.ufpr.br/r-br-guia">http://www.leg.ufpr.br/r-br-guia</a>) e forne�a c�digo m�nimo reproduz�vel.<br></pre></blockquote><div style="font-family:Arial;"> </div>
</div>
</div>
</div>
<div style="font-family:Arial;"> </div>
<div style="font-family:Arial;">_______________________________________________<br></div>
<div style="font-family:Arial;"> R-br mailing list<br></div>
<div style="font-family:Arial;"> <a href="mailto:R-br@listas.c3sl.ufpr.br">R-br@listas.c3sl.ufpr.br</a><br></div>
<div style="font-family:Arial;"> <a href="https://listas.inf.ufpr.br/cgi-bin/mailman/listinfo/r-br">https://listas.inf.ufpr.br/cgi-bin/mailman/listinfo/r-br</a><br></div>
<div style="font-family:Arial;"> Leia o guia de postagem (<a href="http://www.leg.ufpr.br/r-br-guia">http://www.leg.ufpr.br/r-br-guia</a>) e forneça código mínimo reproduzível.<br></div>
</blockquote></div>
</div>
<div><u>_______________________________________________</u><br></div>
<div>R-br mailing list<br></div>
<div><a href="mailto:R-br@listas.c3sl.ufpr.br">R-br@listas.c3sl.ufpr.br</a><br></div>
<div><a href="https://listas.inf.ufpr.br/cgi-bin/mailman/listinfo/r-br">https://listas.inf.ufpr.br/cgi-bin/mailman/listinfo/r-br</a><br></div>
<div>Leia o guia de postagem (<a href="http://www.leg.ufpr.br/r-br-guia">http://www.leg.ufpr.br/r-br-guia</a>) e forneça código mínimo reproduzível.<br></div>
</blockquote><div style="font-family:Arial;"> </div>
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