สถิติเบื้องต้นง่ายๆ ที่จะทำให้คุณเข้าใจการวิเคราะห์มากขึ้น (ตอนที่ 1)

Population and Sample

2.??????? ???????????????

– Mean ???? ????????? ?????????????????????????????????????????? ????

9, 3, 1, 8, 3, 6

????????? = (9 + 3 + 1 + 8 + 3 + 6) / 6 = 5

– Median ???? ??????? ??? ?????????????????????????????????????? ????????????????????????????????? ????

9, 3, 1, 8, 3, 6

???????????? 1, 3, 3, 6, 8, 9 ?????????????????????? 3 ??? 6 ?????? 4.5

– Mode ???? ??????? ??? ??????????????????????????????? ????

9, 3, 1, 8, 3, 6

??????? ??? 3

Range ???? ????? ????????????????????????????????????????? ??? ?????? ????

9, 3, 1, 8, 3, 6

????? ??? 9?1 =8

Variance ???? ??????????????????????????????????????????????????????????????????????????????????? 2

Standard deviation ???? ????????????????????????????????????????????????????? ??? ?????? 2 ????????????

Example

??????????????? ???????????????????????????????????????????????????????????????? ??????????????????????????????????????????????????????????????????????????? ???? ????????? ?????????????????? ?????????????? ???????????????????????????????????????????????????????????????????????????????????????????????????? ???? ????????????????????? ???? Value at Risk ???????

?????????????????????????????????????????????? ??????????????????????

????? ??????? A B C ????????????????????????????? ????????????????????????????????????????

Z-Score ???? ????????????

Z ??? ????? standardized ??????????????????????????????????????????????????????????????

??? ??????????? = 0 ?????????????????????? = 1 ????????????????????

Z-Score Equation

????????????????????????????????????????????????? ??????????????

Standard Normal Distribution

?.????????????????????????????????? ??????????????????????????? Outlier ???? ?????????????????? ????????????

????????????? 95% ??? ???????????? -2SD ??? 2SD ???????????????????????????????? = 55???????????????????????? = 7??????????? ???????????????????????? 95% ????????? 41?69 ???????????? ??????????????????????? 41 ??? ????????????????? 5% ??????????????????????????????? 69 ????????? ??? ???????? Top ?????????????????????? ??? 95% ???????????????????????? ??? Z ?????????????????? -3 ??? +3????????????????????????????????????? ???????????????????

Example

?.??????????????? ?????????????????????? ????????????????? ????????????????????? ???????????? ???? ?????????? Normal Distribution ??????????????????? ??????????????? Big Data ?????????????????????? Clean ?????? ??????? Analysis ?????????????? ??????????????????? ??????????? ??????????????????? ??? ???????????????????? Data Expert ?????????? ??????????????????????? ?????????????????????

#BigData#DataScience#Optimization#ProductivityImprovement#Coraline ???????????????? Data Science and Data Modeling??????????????????????????

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