Created
February 20, 2018 03:49
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Funções para avaliar a normalidade dos dados
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#Função realiza o qqplot com "envelope" | |
#Envelope | |
envelope<-function(x){ | |
n <- length(x) | |
nsim <- 100 # Número de simulações | |
conf <- 0.95 # Coef. de confiança | |
# Dados simulados ~ normal | |
dadossim <- matrix(rnorm(n*nsim, mean = mean(x), sd = sd(x)), nrow = n) | |
dadossim <- apply(dadossim,2,sort) | |
# Limites da banda e média | |
infsup<-apply(dadossim,1,quantile, probs = c((1 - conf) / 2,(1 + conf) / 2)) | |
xbsim <- rowMeans(dadossim) | |
faixay <- range(x, dadossim) | |
qq0 <- qqnorm(x, main = "", xlab = "Quantis teóricos N(0,1)", pch = 20, ylim = faixay) | |
eixox <- sort(qq0$x) | |
lines(eixox, xbsim) | |
lines(eixox, infsup[1,], col = "red") | |
lines(eixox, infsup[2,], col = "red") | |
} |
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normalidade<-function(x){ | |
t1 <- ks.test(x, "pnorm",mean(x), sd(x)) # KS | |
t2 <- lillie.test(x) # Lilliefors | |
t3 <- cvm.test(x) # Cramér-von Mises | |
t4 <- shapiro.test(x) # Shapiro-Wilk | |
t5 <- sf.test(x) # Shapiro-Francia | |
t6 <- ad.test(x) # Anderson-Darling | |
t7<-pearson.test(x) # Pearson Test of Normality | |
testes <- c(t1$method, t2$method, t3$method, t4$method, t5$method,t6$method,t7$method) | |
valorp <- c(t1$p.value, t2$p.value, t3$p.value, t4$p.value, t5$p.value,t6$p.value,t7$p.value) | |
resultados <- cbind(valorp) | |
rownames(resultados) <- testes | |
print(resultados, digits = 4) | |
} |
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