<div dir="ltr">Se a seus dados tiverem zeros ocasionais, você poderia tentar substitui-los por uma costante de valor pequeno como .5.<div><br></div><div>Daniel</div></div><div class="gmail_extra"><br clear="all"><div><div dir="ltr">
<div style="font-family:Calibri,sans-serif"><font face="Verdana"><span style="font-family:arial">\begin{signature}</span><br style="font-family:arial"><span style="font-family:arial"> Daniel Marcelino</span><br style="font-family:arial">
<span style="font-family:arial">☁ </span><a href="mailto:dm.silva@umontreal.ca" style="font-family:arial" target="_blank">dm.silva@umontreal.ca</a><span style="font-family:arial"> </span><br style="font-family:arial"><span style="font-family:arial">☎ 1+(514) 343-6111 #3799</span></font></div>
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<font face="Verdana"><span style="font-family:arial">✎ </span></font><span style="font-family:arial;font-size:small">Canada Research Chair in Electoral Studies</span></div><div style="font-family:Calibri,sans-serif"><font face="Verdana"><span style="font-family:arial"> Université de Montréal</span></font></div>
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<font face="Verdana"><span style="font-family:arial"><br></span></font></div><div style="font-family:Calibri,sans-serif"><font face="Verdana"><span style="font-family:arial">"Small steps towards a much better world"</span></font></div>
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<br><br><div class="gmail_quote">2013/11/27 Daniel Marcelino <span dir="ltr"><<a href="mailto:dmarcelino@live.com" target="_blank">dmarcelino@live.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Ana, a <span>mensagem</span> é <span>clara</span>. Os valores precisam ser positivos >0. <div>
<br></div><div>Daniel</div></div><div class="gmail_extra"><br clear="all"><div><div dir="ltr"><div style="font-family:Calibri,sans-serif"><font face="Verdana"><span style="font-family:arial">\begin{signature}</span><br style="font-family:arial">
<span style="font-family:arial"> Daniel Marcelino</span><br style="font-family:arial"><span style="font-family:arial">☁ </span><a href="mailto:dm.silva@umontreal.ca" style="font-family:arial" target="_blank">dm.silva@umontreal.ca</a><span style="font-family:arial"> </span><br style="font-family:arial">
<span style="font-family:arial">☎ 1<a href="tel:%2B%28514%29%20343-6111%20%233799" value="+5143436111" target="_blank">+(514) 343-6111 #3799</a></span></font></div><div style="font-family:Calibri,sans-serif"><font face="Verdana"><span style="font-family:arial"> Skype: <span><span><span>d.</span></span></span><span><span><span>marcelino</span></span></span> </span></font></div>
<div style="font-family:Calibri,sans-serif"><font face="Verdana"><span style="font-family:arial">✎ </span></font><span style="font-family:arial;font-size:small">Canada Research Chair in Electoral Studies</span></div><div style="font-family:Calibri,sans-serif">
<font face="Verdana"><span style="font-family:arial"> Université de Montréal</span></font></div><div style="font-family:Calibri,sans-serif"><font face="Verdana"><span style="font-family:arial"> C.P. 6128 succursale Centre-ville</span></font></div>
<div style="font-family:Calibri,sans-serif"><font face="Verdana"><span style="font-family:arial"> Montreal, QC, H3C 3J7</span></font></div><div style="font-family:Calibri,sans-serif"><font face="Verdana"><span style="font-family:arial"> Canada</span><br style="font-family:arial">
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<font face="Verdana"><span style="font-family:arial">"Small steps towards a much better world"</span></font></div></div></div>
<br><br><div class="gmail_quote"><div><div class="h5">2013/11/26 ana paula coelho madeira <span dir="ltr"><<a href="mailto:apcmadeira@hotmail.com" target="_blank">apcmadeira@hotmail.com</a>></span><br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div class="h5">
<div><div dir="ltr"><div><span>Boa tarde pessoal,</span></div><div> </div><span><div> Tenho uma variável resposta constituída de comprimento de raízes, porém tenho muitos valores zero (a planta não desenvolveu a raiz). Tentei fazer uma transformação de box-cox para tentar normalizar os dados, porém quando fiz:</div>
<div> </div><div>boxcox(MVR ~ FTR, data = dados, lambda = seq(-1, 1, 0.1))</div><div><br>Error in boxcox.default(MVR ~ FTR, data = dados, lambda = seq(-1, 1,0.1)) : <br> response variable must be positive</div><div> </div>
<div>Isso ocorre devido ao excesso de zeros? Alguma sugestão de como modelar os dados?</div><div>Desde já agradeço</div><span><font color="#888888"><div> </div><div>Ana Paula<br></div><div><br> </div></font></span></span><div>
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