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# загружаем данные | |
dat <- read.csv("https://allatambov.github.io/psms/chip_n_dale_new.csv") | |
# строим диаграмму рассеяния | |
plot(dat$tech, dat$reaction, pch=16) | |
abline(reg = lm(dat$reaction ~ dat$tech), col = "red") | |
# считаем коэффициент корреляции Пирсона | |
cor(dat$tech, dat$reaction) | |
# еще одна диаграмма рассеяния | |
plot(dat$cheer, dat$grump, pch=16) | |
plot(dat$cheer, dat$grump, pch=16, ylim=c(0, 105)) | |
abline(reg = lm(dat$grump ~ dat$cheer), col = "red") | |
# устойчивость корреляции | |
cor(dat$cheer, dat$grump) | |
dat2 <- subset(dat, dat$grump < 105) | |
cor(dat2$cheer, dat2$grump) | |
# посчитаем по определению | |
sx <- sd(dat2$cheeze) | |
sy <- sd(dat2$cheer) | |
cov(dat2$cheeze, dat2$cheer) / (sx * sy) | |
# проверка гипотезы о корреляции | |
cor.test(dat2$cheeze, dat2$cheer) |
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