(12C) Weibull Distribution Parameter Calculation
02-19-2020, 09:19 AM (This post was last modified: 03-01-2020 12:12 PM by Gamo.)
Post: #1
 Gamo Senior Member Posts: 573 Joined: Dec 2016
(12C) Weibull Distribution Parameter Calculation

Procedure: Clear Statistic Register on each new problem

f [∑]
n [R/S] display Data Count
Enter Data [R/S] display 1, 2, 3,....,n
0 [R/S] display β [R/S] ϴ // input 0 "Activate Final Calculations"

β value type of failure meaning
β < 1 infant mortality high probability of failing at early stages
β =1 random failures failures are independent of time
1 < β < 4 early wear out can be due to generic failure modes, such as corrosion
β > 4 rapid wear out steep curve with fast wear out at some point

Example: f [∑] [FIX] 2
Xi: 34, 60, 75, 95, 119, 158 (hours to failure)
(Xi's must be entered in incresing order.)
n=6
β=1.95
ϴ=104.09

f [∑]
6 [R/S] display 6.00
34 [R/S] display 1.00
60 [R/S] display 2.00
75 [R/S] display 3.00
95 [R/S] display 4.00
119 [R/S] display 5.00
158 [R/S] display 6.00

Program:
Code:
 01 STO 7 02  1 03 STO 0 04 X<>Y 05 R/S 06 X=0 07 GTO 28 08 LN 09 RCL 0 10  . 11  3 12  - 13 RCL 7 14  . 15  4 16  + 17  ÷ 18  1 19 STO+0 20 X<>Y 21  - 22 1/x 23 LN 24 LN 25 X<>Y 26 ∑+ 27 GTO 05 28  1 29  ŷ,r 30  0 31  ŷ,r  32 X<>Y 33 R↓ 34  - 35 LSTx 36 X<>Y 37 R/S 38  ÷ 39 CHS 40 e^x 41 GTO 00

Remark:
This program used the [L.R.] function on
program line between 28 - 35

Gamo 2/2020
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