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<div class="moz-cite-prefix">Resumiu tudo.<br>
<br>
Passei por isto este semestre DIVERSAS VEZES.<br>
<pre class="moz-signature" cols="72">[]s
Leonard de Assis
<a class="moz-txt-link-freetext" href="http://about.me/ldeassis">http://about.me/ldeassis</a></pre>
Em 20/11/2012 19:08, Benilton Carvalho escreveu:<br>
</div>
<blockquote
cite="mid:CAO-arWMuXhs64YjOBFRxW_16E8YEwjBPJNr7AMZ+-4-KcMf78w@mail.gmail.com"
type="cite">Infelizmente, estar publicado nao implica em estar
correto. Por isso, a importancia do estatistico local.
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">2012/11/20 Alexandre Santos <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:alexandresantosbr@yahoo.com.br"
target="_blank">alexandresantosbr@yahoo.com.br</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div
style="font-size:10pt;font-family:arial,helvetica,sans-serif">
<div
style="font-family:arial,helvetica,sans-serif;font-size:10pt;text-align:left"
align="center">
<span style="background-color:transparent">Obrigado
Benilton,</span></div>
<div
style="font-family:arial,helvetica,sans-serif;font-size:10pt;text-align:left"
align="center"><span
style="background-color:transparent"><br>
</span></div>
<div
style="font-family:arial,helvetica,sans-serif;font-size:10pt;text-align:left"
align="center"><span
style="background-color:transparent"> Mas o
modelo parece estar correto, estou seguindo a
metodologia empregada por Farhad et al. 2011 pag 2.,
Equação 1. (Foraging behavior of Praon Volucre ....
doi: 10.1155/2011/868546).</span></div>
<div
style="font-family:arial,helvetica,sans-serif;font-size:10pt;text-align:left"
align="center"><span
style="background-color:transparent"><br>
</span></div>
<div
style="font-family:arial,helvetica,sans-serif;font-size:10pt;text-align:left"
align="center">
<span style="background-color:transparent"> Achei
um erro no meu CMR que ficaria:</span></div>
<div
style="font-family:arial,helvetica,sans-serif;font-size:10pt;text-align:left"
align="center"><span
style="background-color:transparent"><br>
</span></div>
<div
style="font-style:normal;font-size:13px;background-color:transparent;font-family:arial,helvetica,sans-serif">
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">> #</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">>
###################################################################################################</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">>
#Regressão logística entre a proporção de
herbivoros predados e a densidade de herbivoros
oferecidos</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">> #</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">>
pred<-c(1,2,2,3,1,4,2,3,2,3,5,6,5,5,3,7,7,6,2</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">+
,3,15,12,14,12,11,11,11,13,13,13,18,14,27,26</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">+
,17,18,20,22,10,15,29,30,36,40,23,50,30,40,29,52)##Número
de herbívoros predados</span></div>
<div class="im">
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">>
dens<-sort(rep(2^(2:6),10))#### Densidade de
herbivoros oferecidos</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">> ##</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">>
##Regressão pred/dens =
exp(P0+P1*N+P2*N^2+P3*N3)/1+
exp(P0+P1*N+P2*N^2+P3*N3)</span></div>
</div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">>
p.model1<-glm(pred/dens~dens+I(dens^2)+I(dens^3),family="binomial")</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">Mensagens
de aviso perdidas:</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">In
eval(expr, envir, enclos) : #sucessos não-inteiro
em um glm binomial!</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">>
summary(p.model1)</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"><br>
</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">Call:</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">glm(formula
= pred/dens ~ dens + I(dens^2) + I(dens^3), family
= "binomial")</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"><br>
</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">Deviance
Residuals: </span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"> Min
1Q Median 3Q Max </span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">-0.85240
-0.17292 -0.05812 0.19453 1.10008 </span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"><br>
</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">Coefficients:</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">
Estimate Std. Error z value Pr(>|z|)</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">(Intercept)
-5.744e-01 1.231e+00 -0.467 0.641</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">dens
2.238e-01 2.244e-01 0.997 0.319</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">I(dens^2)
-8.846e-03 9.018e-03 -0.981 0.327</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">I(dens^3)
8.671e-05 9.154e-05 0.947 0.344</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"><br>
</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">(Dispersion
parameter for binomial family taken to be 1)</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"><br>
</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"> Null
deviance: 8.1347 on 49 degrees of freedom</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">Residual
deviance: 6.8751 on 46 degrees of freedom</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">AIC:
67.087</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"><br>
</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">Number of
Fisher Scoring iterations: 4</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"><br>
</span></div>
<div
style="font-style:normal;font-size:13px;font-family:arial,helvetica,sans-serif"><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">> #</span></div>
<div
style="font-style:normal;font-size:10pt;font-family:arial,helvetica,sans-serif"><br>
</div>
<div
style="font-style:normal;font-size:10pt;font-family:arial,helvetica,sans-serif">Mas
é exatamente o seu exemplo que eu procurava, pois eu
queria os coeficientes de P0, P1, P2 e P3, seguindo
sua ajuda:</div>
<div
style="font-style:normal;font-size:10pt;font-family:arial,helvetica,sans-serif"><br>
</div>
<div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">>
naoPred<-dens-pred</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">>
p.model2<-glm(cbind(pred, naoPred)~poly(dens,
3, raw=TRUE), family='binomial')</span></div>
<div>
<span
style="font-family:arial,helvetica,sans-serif;font-size:13px">>
summary(p.model2)</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"><br>
</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">Call:</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">glm(formula
= cbind(pred, naoPred) ~ poly(dens, 3, raw =
TRUE), </span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">
family = "binomial")</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"><br>
</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">Deviance
Residuals: </span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">
Min 1Q Median 3Q Max </span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">-3.2393
-0.9997 -0.0732 0.9515 4.2567 </span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"><br>
</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">Coefficients:</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">
Estimate Std. Error z
value Pr(>|z|) </span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">(Intercept)
-8.399e-01 4.949e-01 -1.697
0.089672 . </span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">poly(dens,
3, raw = TRUE)1 2.688e-01 7.444e-02 3.611
0.000305 ***</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">poly(dens,
3, raw = TRUE)2 -1.055e-02 2.755e-03 -3.828
0.000129 ***</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">poly(dens,
3, raw = TRUE)3 1.033e-04 2.681e-05 3.853
0.000117 ***</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">---</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">Signif.
codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1
‘ ’ 1 </span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"><br>
</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">(Dispersion
parameter for binomial family taken to be 1)</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"><br>
</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">
Null deviance: 148.29 on 49 degrees of
freedom</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">Residual
deviance: 121.77 on 46 degrees of freedom</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">AIC:
280.61</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"><br>
</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">Number
of Fisher Scoring iterations: 4</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px"><br>
</span></div>
<div><span
style="font-family:arial,helvetica,sans-serif;font-size:13px">>
#</span></div>
<div
style="font-style:normal;font-size:10pt;font-family:arial,helvetica,sans-serif"><br>
</div>
<div
style="font-style:normal;font-size:10pt;font-family:arial,helvetica,sans-serif"><br>
</div>
<div
style="font-style:normal;font-size:10pt;font-family:arial,helvetica,sans-serif">Obrigado
pelas dicas e correções,</div>
<div
style="font-style:normal;font-size:10pt;font-family:arial,helvetica,sans-serif"><br>
</div>
<div
style="font-style:normal;font-size:10pt;font-family:arial,helvetica,sans-serif"><br>
</div>
<div
style="font-style:normal;font-size:10pt;font-family:arial,helvetica,sans-serif">Alexandre</div>
</div>
<div
style="font-style:normal;font-size:10pt;font-family:arial,helvetica,sans-serif"><br>
</div>
<div class="hm HOEnZb">
<div
style="font-style:normal;font-size:10pt;font-family:arial,helvetica,sans-serif"><br>
</div>
</div>
</div>
<div class="hm HOEnZb"> </div>
<div
style="font-family:arial,helvetica,sans-serif;font-size:10pt">
<div class="hm HOEnZb"> </div>
<div style="font-family:'times new roman','new
york',times,serif;font-size:12pt">
<div class="hm HOEnZb">
<div dir="ltr"> <font face="Arial">
<hr size="1"> <b><span
style="font-weight:bold">De:</span></b>
Benilton Carvalho <<a
moz-do-not-send="true"
href="mailto:beniltoncarvalho@gmail.com"
target="_blank">beniltoncarvalho@gmail.com</a>><br>
<b><span style="font-weight:bold">Para:</span></b>
r-br <<a moz-do-not-send="true"
href="mailto:r-br@listas.c3sl.ufpr.br"
target="_blank">r-br@listas.c3sl.ufpr.br</a>>;
Alexandre Santos <<a moz-do-not-send="true"
href="mailto:alexandresantosbr@yahoo.com.br"
target="_blank">alexandresantosbr@yahoo.com.br</a>>
<br>
<b><span style="font-weight:bold">Enviadas:</span></b>
Terça-feira, 20 de Novembro de 2012 16:30<br>
<b><span style="font-weight:bold">Assunto:</span></b>
Re: [R-br] Dúvida em summary em regressão
logística<br>
</font> </div>
</div>
<div>
<div class="h5"> <br>
<div>
<div>Seu exemplo nao e' reproduzivel e seu
modelo nao esta' correto.</div>
<div><br>
</div>
<div>Consulte seu estatistico local para
esclarecimentos mais detalhados.</div>
<div><br>
</div>
<div>Uma regressao logistica modela a
probabilidade de sucesso dado um conjunto de
covariaveis. No seu caso, "sucesso" (para o
predador) parece ser o herbivoro ser
predado.</div>
<div><br>
</div>
<div>Dito isso, se "naoPred" fosse o numero de
herbivoros que nao foram predados, a
especificacao do seu modelo seria</div>
<div><br>
</div>
<div>glm(cbind(pred, naoPred)~poly(dens, 3,
raw=TRUE), family='binomial')</div>
<div><br>
</div>
<div>Se vc usar a representacao na escala
probalistica (note que faltam uns parenteses
na sua representacao):</div>
<div><br>
</div>
<div>Prob(Sucesso) =
exp(P0+P1*N+P2*N^2+P3*N^3)/(1+exp(P0+P1*N+P2*N^2+P3*N^3))</div>
<div><br>
</div>
<div>o resultado do summary (os coeficiences)
mostrado(s) representa(m) respectivamente
P0, P1, P2 e P3.</div>
<div><br>
</div>
<div>b</div>
<div><br>
<br>
<div>2012/11/20 Alexandre Santos <span
dir="ltr"><<a moz-do-not-send="true"
rel="nofollow"
href="mailto:alexandresantosbr@yahoo.com.br"
target="_blank">alexandresantosbr@yahoo.com.br</a>></span><br>
<blockquote style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div>
<div
style="font-size:10pt;font-family:arial,helvetica,sans-serif">
<div align="center">
<div style="text-align:left"><span
style="background-color:transparent">Boa tarde Pessoal,</span></div>
<div style="text-align:left"><span
style="background-color:transparent"> Estou ajustando uma
regressão logística e me
deparei com a seguinte dúvida:</span></div>
<div style="text-align:left"><span
style="background-color:transparent"> </span></div>
<div><font face="arial, helvetica,
sans-serif">###################################################################################################</font></div>
<div><font face="arial, helvetica,
sans-serif">#Regressão
logística entre a proporção
de herbívoros predados e a
densidade
de herbívoros oferecidos</font></div>
<div><font face="arial, helvetica,
sans-serif">#</font></div>
<div><font face="arial, helvetica,
sans-serif">pred<-c(1,2,2,3,1,4,2,3,2,3,5,6,5,5,3,7,7,6,2</font></div>
<div><font face="arial, helvetica,
sans-serif">,3,15,12,14,12,11,11,11,13,13,13,18,14,27,26</font></div>
<div><font face="arial, helvetica,
sans-serif">,17,18,20,22,10,15,29,30,36,40,23,50,30,40,29,52)##Número
de herbívoros predados</font></div>
<div><font face="arial, helvetica,
sans-serif">dens<-sort(rep(2^(2:6),10))####
Densidade de herbivoros
oferecidos</font></div>
<div><font face="arial, helvetica,
sans-serif">##</font></div>
<div><font face="arial, helvetica,
sans-serif">##Regressão
pred/dens =
exp(P0+P1*N+P2*N^2+P3*N3)/1+
exp(P0+P1*N+P2*N^2+P3*N3)</font></div>
<div><font face="arial, helvetica,
sans-serif">p.model1<-glm(pred/par~dens+I(dens^2)+I(dens^3),family="binomial")</font></div>
<div><font face="arial, helvetica,
sans-serif">summary(p.model1)</font></div>
<div><font face="arial, helvetica,
sans-serif">#</font></div>
<div
style="font-style:normal;font-size:13px;background-color:transparent;font-family:arial,helvetica,sans-serif"><font
face="arial, helvetica,
sans-serif"><br>
</font></div>
<div
style="font-style:normal;font-size:13px;background-color:transparent;font-family:arial,helvetica,sans-serif"><font
face="arial, helvetica,
sans-serif"><br>
</font></div>
<div><font face="arial, helvetica,
sans-serif">Minha dúvida é se
o coeficiente linear que
aparece no summary esta
transformado em
exp(x)/1+exp(x)</font></div>
<div>
<font face="arial, helvetica,
sans-serif">ou trata-se do
valor sem transformação?</font></div>
<div><font face="arial, helvetica,
sans-serif"><br>
</font></div>
<div><font face="arial, helvetica,
sans-serif">Obrigado,</font></div>
<span><font color="#888888">
<div
style="font-style:normal;font-size:13px;background-color:transparent;font-family:arial,helvetica,sans-serif"><font
face="arial, helvetica,
sans-serif"><br>
</font></div>
<div
style="font-style:normal;font-size:13px;background-color:transparent;font-family:arial,helvetica,sans-serif"><font
face="arial, helvetica,
sans-serif">
<pre>--
======================================================================
Alexandre dos Santos
Proteção Florestal
IFMT - Instituto Federal de Educação, Ciência e Tecnologia de Mato Grosso - Campus Cáceres
Avenida dos Ramires, s/n
Bairro: Distrito Industrial
Cáceres - MT CEP: 78.200-000
Fone: <a moz-do-not-send="true" rel="nofollow">(+55) 65 8132-8112</a> (TIM) <a moz-do-not-send="true" rel="nofollow">(+55) 65 9686-6970</a> (VIVO)
<a moz-do-not-send="true" rel="nofollow" href="mailto:e-mails:alexandresantosbr@yahoo.com.br" target="_blank">e-mails:alexandresantosbr@yahoo.com.br</a>
<a moz-do-not-send="true" rel="nofollow" href="mailto:alexandre.santos@cas.ifmt.edu.br" target="_blank">alexandre.santos@cas.ifmt.edu.br</a>
======================================================================</pre>
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<pre wrap="">_______________________________________________
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