26 lines
992 B
R
26 lines
992 B
R
t.test_knownvar <- function(x, y, V1, V2, m0 = 0, alpha = 0.05, 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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sigma1 <- sqrt(V1)
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sigma2 <- sqrt(V2)
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S <- sqrt((V1 / n1) + (V2 / n2))
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statistic <- (M1 - M2 - m0) / S
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p <- if (alternative == "two.sided") {
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2 * pnorm(abs(statistic), lower.tail = FALSE)
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} else if (alternative == "less") {
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pnorm(statistic, lower.tail = TRUE)
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} else {
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pnorm(statistic, lower.tail = FALSE)
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}
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LCL <- (M1 - M2 - S * qnorm(1 - alpha / 2))
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UCL <- (M1 - M2 + S * qnorm(1 - alpha / 2))
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value <- list(mean1 = M1, mean2 = M2, m0 = m0, sigma1 = sigma1, sigma2 = sigma2, S = S, statistic = statistic, p.value = p, LCL = LCL, UCL = UCL, alternative = alternative)
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# print(sprintf("P-value = %g",p))
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# print(sprintf("Lower %.2f%% Confidence Limit = %g",
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# alpha, LCL))
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# print(sprintf("Upper %.2f%% Confidence Limit = %g",
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# alpha, UCL))
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return(value)
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} |