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sign test - Wikipedia Articles

  • Sign test

    In statistics, the sign test can be used to test the hypothesis that there is "no difference in medians" between the continuous distributions of two random variables X and Y, in the situation when we can draw paired samples from X and Y. It is a non-parametric test which makes very few assumptions about the nature of the distributions under test - this means that it has very general applicability but may lack the statistical power of other tests such as the paired-samples t-test or the Wilcoxon signed-rank test.[citation needed] Contents 1 Method 2 Assumptions 3 Significance testing 4 See also 5 References Method [edit] Let p = Pr(X > Y), and then test the null hypothesis H0: p = 0.50. In other words, the null hypothesis states that given a random pair of measurements (xi, yi), then xi and yi are equally likely to be larger than the other. To test the null hypothesis, independent pairs of sample data are collected from the populations {(x1, y1), (x2, y2), . . ., (xn, yn... (see more)

  • Skewness risk

    Skewness risk in financial modeling denotes that observations are not spread symmetrically around an average value. As a result, the average and the median can be different. Skewness risk applies to any quantitative model that relies on a symmetric distribution (such as the normal distribution). Ignoring skewness risk, by assuming that variables are symmetrically distributed when they are not, will cause any model to understate the risk of variables with high skewness. Skewness risk plays an important role in hypothesis testing. The analysis of variance, the most common test used in hypothesis testing, assumes that the data is normally distributed. If the variables tested are not normally distributed because they are too skewed, the test cannot be used. Instead, nonparametric tests can be used, such as the Mann–Whitney test for unpaired situation or the sign test for paired situation. Skewness risk and kurtosis risk also have technical implications in calculation of value at risk.... (see more)

sign test - eHow Articles

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    Most states require individuals to pass tests in order to earn a driver's license. For both new drivers and new state residents, those tests generally include written ...

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    The ACT is a standardized test, like the SAT, that is used for college admissions. But it's a little different, and some people prefer it to the SAT. Other ...

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    Think carefully about which colleges, if any, you want your scores forwarded to. The organization that administers the test offers to send test scores to up to three ...

  • Video: How to Practice Sign Language | eHow

    Practice sign language in a mirror or find a deaf person to help you. Discover ways to practice sign language in this free video on the American Sign Language from a ...

  • How to Sign Up to Take the LSAT | eHow

    The Law School Admission Test (LSAT) is a graduate entrance examination required for students applying to law school. If you're one of them, here's how to sign up.

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