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  • What is a Survey?

    A series of pamphlets place online by the American Statistical Association, Survey Research Methods Section. Each pamphlet deals with a different aspect of survey research and how it is done.

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  • Probability Sampling

    This website lists five different types of probability sampling, giving the advantages and disadvantages of each.

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  • The One-Sample t Test

    This section on Common Statistical Tests uses an example on faculty publications to show users how to perform a one-sample t test. The discussion includes one-tailed and two-tailed tests.

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  • Likelihood Ratio Test

    This site focuses on using the LRT to compare two competing models.

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  • Log-likelihood ratio

    This site offers an involved definition of the likelihood ratio test with examples and formulas.

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  • Kruskal-Wallis "Analysis of Variance" by Ranks

    Explains how to set up the Kruskal-Wallis test and gives the formula for the test statistic.

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  • The Beta Distribution

    This applet allows the user to adjust a (1st shape) and b (2nd shape) parmaters of the Beta distribution with a slider or manual input. The applet allows the user to fix the x and or y axes. The user immediately sees how this affects the the shape of the graph as well as the variance and the expected value. This page was formerly located at http://www.stat.vt.edu/~sundar/java/applets/BetaDensityApplet.html

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  • Chi Square Tests

    The eighth chapter of an online Introduction to Biostatistics course. Lecture notes are provided. Additionally, links for additional reading and exercises with solutions are provided.

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  • Spearman's rho

    Gives a very brief explanation of Spearman' rho and how it differs from Pearson's r.

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  • Case Teaching Notes for "Markov vs. Markov"

    Teacher instructions to accompany "Markov vs. Markov" case study found at http://ublib.buffalo.edu/libraries/projects/cases/markov/markov.html.

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