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<p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span style="font-size: 10pt; font-family: "Courier New";">oi pessoal..</span></p><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span style="font-size: 10pt; font-family: "Courier New";">Oi Daniel, obrigada pela ajuda, respondendo a pergunta.. sim a variável salario é numerica e a variavel instrução é fator..</span></p><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span style="font-size: 10pt; font-family: "Courier New";">será isso o problema? como mudo, o arquivo é um data.frame.</span></p><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal;"><span style="font-size: 10pt; font-family: "Courier New";"><br></span></p><p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:
normal;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span style="font-size:10.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman";
mso-fareast-language:PT-BR">reposta Daniel: Não deu certo como? O que saiu no R? A variável
salário esta adequadamente<br>
reconhecida como numérica?<br>
<span style="mso-spacerun:yes"> </span><br>
2011/5/24 carla eloize carducci <elocarducci@hotmail.com><br>
<span style="mso-spacerun:yes"> </span><br>
><span style="mso-spacerun:yes"> </span>OI PESSOAL<br>
> sou uma aprendiz<span style="mso-spacerun:yes"> </span>bem iniciante
do<span style="mso-spacerun:yes"> </span>R, preciso de ajuda com um teste de<br>
> hipótese, alguém pode me ajudar?<br>
> bom, é o seguinte: tenho um conj de dados com duas variáveis, quero fazer<br>
> um t.test para verificar se as médias dos salarios (variável numerica)<br>
> de funcionários com diferente grau de instrução (2ºgrau e superior,<br>
> variável categorica) são diferentes ou não.<br>
> tentei fazer o seguinte: meu arquivo é da apostila do prof. justiniano o<br>
> velho arquivo 'milsa'.(bem de iniciante)<br>
> # teste de hipótese: H0:salario 2grau = superior# formulei essa hipotese<br>
> #<span style="mso-spacerun:yes"> </span>H1:salario
2grau diferente superior<br>
><br>
> milsa$instrucao <- factor(milsa$instrucao, label =
c("2oGrau", "Superior"),<br>
> lev = 1:2, ord = T)<br>
> var.test(milsa$salario~milsa$instrucao)<br>
> alpha <- 0.05 # especifica valor da signific^ancia<br>
> if (var.test$p.value > alpha)<br>
> diff.test <- t.test(milsa$salario ~ milsa$instrucao,alternative =<br>
> "two.sided", var.equal = TRUE, conf.level = 1-alpha) else<br>
> diff.test <- t.test(milsa$salario ~ milsa$instrucao, alternative =<br>
> "two.sided", var.equal = FALSE,conf.level = 1-alpha)<br>
> diff.test<br>
> não deu certo, o que estou esquecendo? não acho o erro.</span></p>
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<br><br><font style="" face="Tahoma"><b>Atenciosamente</b></font><font style="" face="Tahoma">,</font><font style="" face="Tahoma"><br></font><br><font style="" face="Comic Sans MS"><b><i>Carla Eloize Carducci<br></i></b>Engº Agronoma (UFGD)<br>Msc. Ciência do Solo (UFLA)<br>Doutoranda em Ciência do Solo (UFLA)<br></font><br><br> </body>
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