엔류의 CFA 노트: <Lv1, R2, M 2.1> Organizing Data

Reading 2 : <Organizing, Visualizing, and Describing Data>

{ Skewness, Kurtosis, Correlation }

<Module 2.1> : Organizing data

▷ LOS 2.a

▷ LOS 2.b

    - One Dimensional Array

    - Two Dimensional Array (Data Table) 

 

▷ LOS 2.c

    - Frequency Distribution

    - Data table, as a Tabular presentation of statistical data 

    - Interval ↔ Classes

    - Relative Frequency ↔ Absolute Frequency

             ↓

      Absolute Frequency를 전체 횟수로 나누어서 상대비율을 나타낸 것.

    - Cumulative absolute frequency, cumulative relative frequency

 

▷ LOS 2.d : Contingency table

    - Joint frequencies ↔ Marginal frequencies

    - Joint Relative Frequencies =  Joint frequencies / total number of values

       ⚠️ Joint Relative Frequencies ≠ Joint frequencies

    - Contingency table  ⊃ Confusion Matrix

    - Chi-square test statistic 카이제곱 검정 → X² 검정