Created
October 30, 2025 14:45
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Razao de chances e teste de fisher
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| link = 'https://github.com/DATAUNIRIO/dados_para_aula/raw/refs/heads/main/csv/Titanic.csv' | |
| link2 ='https://github.com/DATAUNIRIO/dados_para_aula/raw/refs/heads/main/csv/students.csv' | |
| titanic = read.delim2(link,sep = ";") | |
| estudantes = read.csv(link2) | |
| table(estudantes$Sex,estudantes$Major) | |
| library(forcats) | |
| estudantes$Novo_Major = fct_lump(estudantes$Major, n = 3) | |
| table(estudantes$Sex,estudantes$Novo_Major) | |
| probabilidade_mulher = 7/(1+7+6+5) | |
| probabilidade_homem = 9/(8+9+3+9) | |
| homem = 9/(8+3+9) | |
| mulher = 7/(1+6+5) | |
| mulher/homem | |
| #------------------------------------------------------------------------------ | |
| estudantes$estatistica = ifelse(estudantes$Novo_Major=="statistics",1,0) | |
| modelo = glm(estatistica ~ Sex, binomial(link = "logit"), data = estudantes) | |
| summary(modelo) | |
| exp(-0.2595) | |
| 1/exp(-0.2595) | |
| #---------------------------------------------------------------------------- | |
| ### Tabela para o teste | |
| M <- as.table(rbind(c(762, 468), c(484, 477))) | |
| ### Rótulos para tabela | |
| dimnames(M) <- list(sexo = c("Feminino", "Masculino"), | |
| partido = c("PT", "PL")) | |
| fmpt =((762+484)*(762+468))/2191 | |
| mspt =((762+484)*(477+484))/2191 | |
| fmpl =((762+468)*(477+468))/2191 | |
| mspl =((477+484)*(477+468))/2191 | |
| teste = chisq.test(M) | |
| teste$expected | |
| #### Gráfico | |
| library("gplots") | |
| balloonplot(t(M), main ="Partido", xlab ="", ylab="", | |
| label = FALSE, show.margins = FALSE) |
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