35 lines
785 B
R
35 lines
785 B
R
t.test_multiple <- function(x, y, m0=0, alternative = "two.sided") {
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M1 <- mean(x)
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M2 <- mean(y)
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n1 <- length(x)
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n2 <- length(y)
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S <- sqrt((var(x) / n1) + (var(y) / n2))
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statistic <- (M1 - M2 - m0) / S
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p <- if (alternative == "two.sided") {
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2 * pt(q=abs(statistic), df=n1+n2-2, lower.tail=FALSE)
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} else if (alternative == "less") {
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pt(q=statistic, df=n1+n2-2, lower.tail = TRUE)
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} else {
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pt(q=statistic, df=n1+n2-2, lower.tail = FALSE)
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}
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value <- list(mean1 = M1, mean2 = M2, df=n1+n2-2, m0 = m0, statistic = statistic, p.value = p, alternative = alternative)
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return(value)
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}
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#dwie próby zależne
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load("Cisnienie.RData")
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attach(Cisnienie)
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t.test(x=Po, y=Przed, alternative='less')
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t.test_multiple(x=Po, y=Przed, alternative='less')
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