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Processamento de tabela em R
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x | y | |
---|---|---|
20 | 1.79 | |
41.5 | 3.49 | |
100 | 5.99 | |
110 | 4.99 |
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dados <- read.csv('dados.csv') | |
dados$xy <- dados$x * dados$y | |
dados$x2 <- dados$x ^ 2 | |
dados$y2 <- dados$y ^ 2 | |
ret <- dados | |
ret <- rbind(ret, data.frame(x=sum(dados$x), y=sum(dados$y), xy=sum(dados$xy), x2=sum(dados$x2), y2=sum(dados$y2))) | |
ret <- rbind(ret, data.frame(x=mean(dados$x), y=mean(dados$y), xy=mean(dados$xy), x2=mean(dados$x2), y2=mean(dados$y2))) | |
z <- lm(dados$y ~ dados$x) | |
summary(z) | |
write.csv(ret, file='ret.csv', row.names=FALSE) | |
plot(dados$y ~ dados$x, type='p', xlab='Peso (g)', ylab='Preço (R$)') | |
abline(z) |
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