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<div class="MsoNormal">Prezados membros,</div><div class="MsoNormal"><br></div>Peço a ajuda de vocês para o seguinte problema:<span style="mso-spacerun:yes"> </span>Eu tenho uma planilha
com dois fatores (“espécie” e “sexo”) e uma <span style="mso-spacerun:yes"> </span>variável contínua (“tamanho”). Quero analisar se
existe diferença no tamanho de machos e fêmeas para cada espécie. Assim,
preciso fazer um teste T para cada espécie. <span style="mso-spacerun:yes"> </span>O problema é que eu tenho 288 espécies (uma
planilha de 6638 linhas) e, portanto, fazer um subset para cada espécie não me parece uma solução muito boa (e provavelmente não é!). <div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;" class="MsoNormal"><br></div><div class="MsoNormal">Eu queria fazer um teste T para cada nível do fator "especie".<span style="mso-spacerun:yes"> </span>Alguém tem alguma
ideia de como eu poderia fazer isso sem precisar fazer um subset para cada
espécie? <br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;" class="MsoNormal"><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;" class="MsoNormal">A princípio eu achei que isso seria fácil (e provavelmente seja), no entanto o meu pouco conhecimento sobre o R não está me ajudando. <br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;" class="MsoNormal"><br></div>
<div class="MsoNormal">Eu estou enviando um exemplo hipotético do formato da minha
planilha:</div><div class="MsoNormal"><br></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US">especie<-rep(c("a","b","c"),each=6)</span></div>
<div class="MsoNormal"><span style="mso-ansi-language:EN-US" lang="EN-US">sexo<-rep(c("f","m"),
each = 3, len = 18)</span></div>
<div class="MsoNormal">tamanho<-c(1.5,1.6,1.8,1.3,1.1,1.2,2.5,2.7,2.6,2.1,2.2,2.1,3.5,3.6,3.7,3.1,3.3,3.2)</div>
<div class="MsoNormal">data<-data.frame(especie,sexo,tamanho)</div>
<div class="MsoNormal"> </div>
<div class="MsoNormal">Um abraço a todos e obrigado pela atenção.</div>
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<![endif]--><div><span></span></div><div> </div><div><font face="arial"><span style="font-weight:bold;">Marcelo Costa<br></span></font><br><font face="arial"><br></font></div></div></body></html>