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  • Statics2
    作者: other | 发布时间: 2020-11-01 20:26:11 | 点击量: 60
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    1.3 Measurement for average level

        Numerical characteristics:

            Average level

            Variation

    1.3.1 Arithmetic mean

        Useful when the histogram looks symmetric.

        Denote the observed values of the individuals

        with x1, x2,... xn, the arithmetic mean

        x= (x1+x2+...xn) /n


    1.3.2 Geometric mean

        it is useful when the histogram of the logarithms is 

        close to symmetric.


    1.3.3 Median

        when the histogram shows skew, the median can

        be applied to measure the average level

        median = the value in the middle

        when n is odd,

        when n is even,


    25 percentile P25:

    75 percentile P75:

    P2.5

    P97.5



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