此次，高頓小編為大家?guī)砹私y(tǒng)計的概念和市場回報講解分析：
　　PartⅠ:Statistical Concepts and Market Returns
　　Descriptive Statistics & Inferential Statistics
　　Population & Sample
　　Types of Measurement Scales
　　·Nominal Scales
　　·Ordinal Scales
　　·Interval Scales
　　·Ratio Scales
　　Frequency Distribution
 
　　·Absolute frequency & Relative frequency
　　·Cumulative frequency
　　·Histogram & Frequency polygon
　　Measures of Central Tendency
　　·Mean;Arithmetic mean;Geometric mean;Weighted mean;Harmonic mean;
　　·Harmonic mean≦geometric mean≦arithmetic mean
　　·Populatin mean(μ)and sample mean(χ)
　　·Median and Mode
　　Quantiles
　　·Median;Quartiles;Quintile;Decile;Percentile
　　·if n*percentile is a whole number,Ly=n*y/100
　　Measures of Dispersion
　　·Range=maximum value-minimum value
　　·Mean absolute deviation
　　·Variance—Population variance & Sample variance
　　·Standard Deviation:σ S
　　·Semivariance & Target Semivariance
　　Relative Disperision
　　·Coefficient of variation:relative disperision:CV=s/X
　　·Sharp Ratio=(R-Rf)/ σ
　　Chebyshev’s Inequality
　　·對于任意一組觀測值，個體落于均值周圍k個標準差之內的概率不小于1-1/k2,其中任意k﹥1.
　　Skewness
　　·Symmetrical and nonsymmetrical distributions
 
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　　·Positively skewed and negatively skewed
　　Kurtosis
　　·Excess kurtosis is measured relative to a normal distribution,which has a kurtosis of 3,Excess kurtosis=sample kurtosis-3
　　·Positive values of excess kurtosis and Negative values of excess kurtosis
　　·0 excess kurtosis indicate mesokurtic distribution
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