2009年10月28日 星期三

Continuous improvement

There is room for improvement.



There is house for improvement.

There is building for improvement.

There is city for improvement.

There is GeoCities for improvement.

There is planet for improvement.

There is black hole for improvement.

There is solar system for improvement.

There is universe for improvement.

爛。

2009年10月6日 星期二

How to get rid of tables

當我看見 Standard Normal Distribution 這個美好的 Table,便想起上年已經印了一次。
今年又要印多次?(其實可以帶本書去,但係本書太大本唔方便掀。)

我當然想用計數機計。於是便找到:
http://webcal.freetzi.com/3650P/standardnormal4.htm

很好。1274148Ans - 1422484Ans2 + 7107069Ans3 -7265760Ans^4 + 5307027Ans^5 都寫得出。
一個積分函數都 expand 到變五次方程咁。(? 那是 10^x 吧)

Appendix B 是更嘔心的 Table: "Factors for Control Charts"
那些變數名是 Obfuscated 的:A_2, A_3, d_2, d_3, D_1, D_2, D_3, D_4
之後不小心找到:
http://www.technion.ac.il/docs/sas/qc/chapc/sect21.htm
這裡有些上堂也講過的。不過最大問題還是 d_2 和 d_3
之後...

http://www.technion.ac.il/docs/sas/qc/chapc/sect9.htm
http://www.technion.ac.il/docs/sas/qc/chapc/sect10.htm

想點啊大佬。