PROBABILITY DISTRIBUTION CHARTS

Select Distribution

3

WEI

ACCEPT

Weibull

PDF, Reliability, Unreliability, Hazard Rate, Cumulative Hazard Rate

GROUP DATA

Average

3.71997

Sample Standard Deviation

2.1074167

Optimal Number of Groups [Sturges' Rule]

7.6438562

Number of Groups

8

Total Number of Observations

100

RESIDUAL LIFETIME

Residual Lifetime Percentile

50.0%

Median Residual Lifetime

3.4230769

Standard Error of Median Residual Lifetime

0.1923077

GOOGNESS OF FIT

Probability Distribution Function

WEI

P

Location Parameter μ

0.0344217

P

Scale Parameter σ

4.1272319

P

Shape Parameter β

1.9377593

Number of Parameters Estimated m [m ≤ n]

3

Total Number of Parameters n

3

Chi-Square Σ(Oi-Ei)2/Ei

5.295442

Degrees of Freedom df

4

Test χ2

9.487729

Accept / Reject

ACCEPT

Chi-Square Rank

2

The marker P identifies the probability distribution's parameters.

Legend

SYMBOL

VARIABLE

T1=T

Start of Interval [Age at Start of Mission]

T2=T+t

End of Interval

t=T2-T1

Duration of Interval [Mission Time]

τ=(T1+T2)/2

Interval Midpoint

i

Group

H

Histogram

f(τ)

Probability Density Function at Midpoint

R(T)

Reliability [Survival or Cumulative Proportion Surviving] at T

R(T+t)

Reliability [Survival or Cumulative Proportion Surviving] at T+t

Q(T)

Unreliability [Failure or Cumulative Proportion Terminating] at T

Q(T+t)

Unreliability [Failure or Cumulative Proportion Terminating] at T+t

λ(τ)

Hazard Rate at Midpoint

Mi

Median Residual Lifetime

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