Statitics

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  • Statitics
    • Quartiles
      • IQR=Q3-Q1
      • Q1 is lower quartile
      • Q2 is the median
      • Q3 is upper quartile
      • The range = Q4-Q0
      • Deciles- divide the dataset into 10 parts
      • Percentiles - divide dataset into 100 parts
      • Quartiles - divide dataset into 4 parts
    • Skewness
      • Positively skewed
        • Q3-Q2>Q2-Q1
        • Mode < median < mean
          • coefficient
            • Q3-2Q2+Q1/Q3-Q1
      • 3x(mean-median) / standard deviation
      • mean-mode/standard deviation
      • Negatively skewed
        • mean < median < mode
        • Q3-Q2 < Q2-Q1
      • Symmetric distribution
        • Q3-Q2 = Q2-Q1
        • median = mean
    • Coding
      • Mean of Y = a x mean of X +b
      • SD of Y = standard deviation of X
      • Variance of Y = a2 x variance of X
    • Discrete random variable
      • pi = 1
    • Probability
      • AUB is the union A and B
      • P(XUY) = P(X) +P(Y)- P(XnY)
      • A' means 'does not happen'
      • A|C is the intersection of events A and C
      • P(A|B) =P(AnB)/P(B)
        • P(AUB) = P(A) + P(B)

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