Statistics

Mean: 평균,

SE 0f Mean: 평균의 표준오차,

Standard Deviation (StDev): 표준편차,

Variance: 분산,

Central Tendency: 중심경향성

Range: 범위 (Maximum - Minimum)

IQR (Interquartile Range): 사분위간 범위 (Q3-Q1)

Minimum: 최소값

First Quartile: 1사분위수 (Q1), 25%

Median: 중앙값, 50%

Third Quartile: 3사분위수 (Q3), 75%

Maximum: 최대값

Sum: 합

Mode: 최빈값, frequency가 높은 수

Histogram: 히스토그램, 실제적 특성파악

Distribution: 분포,        잠재적 특성파악

Normal Distribution: 정규분포,

Standard Normal Distribution: 표준정규분포, ,  

Z Transformation:Z변화(표준화):

Central Limit Theorem: 중심극한정리, n이 커질수록 정규분포 에 가까워짐

Probability Density: 확률밀도함수, f(x) = P(X=x)

Cumulative Probability: 누적확률, F(x) = P(X≤x)

Inverse Cumulative Probability: 해당 x

Calc > Probability Distribution > Normal, Binomial

Expectation, Expected Value: 기대값, ,

Continuous Data (Variable Data): 연속형(계량형) 데이터

Discrete Data(Attribute Data): 이산형(계수형) 데이터

6Sigma

1.5 Sigma => 4.5Sigma = 3.4ppm (=3.45E-6)

Gage Repeatability & Reproducibility Study

계량형 Gage R&R: Stat > Quality Tools > Gage Study > Gage R&R Study (Crossed)

계수형 Gage R&R: Stat > Quality Tools > Attribute Agreement Analysis

평가기준:

Accepatable - %Contribution:[<1%], %Study Variationor[<10%], %Tolerance[>10]

Reject -          %Contribution:[>10%], %Study Variationor[>30%], %Tolerance[<4]