The macros below are ”home made” and not guaranteed to work well under all circumstances. If you have problems, it may be useful to start with a MINITAB worksheet which is empty in all other columns than the ones that are given as input. If you improve some of the macros, then you may well send them to the lecturer (who may put them here). If you want to edit some of the macros, it seems that WordPad in Windows is the best program to use.
MINITAB has usually a directory C:\Program
Files\MINITAB 14\Macros where it puts its own macros. If you copy one of the
macros to this directory, then you may call it by for example MTB>%TMA4275nelson.txt c1-c7
Note that if you put the macro on an address which contains blanks, then the address must be written in “quotes”, i.e. ‘ ‘ , for example
MTB> %’C:\your minitab directory\TMA4275nelson.txt’ c1-c7
You are advised to always use the quotes when using the macros (see examples
below).
More detailed description of how to use the macros is given below. You may also download the
macros from here.
Nelson-plot – User’s manual
· Download the file and put it (for example) in the directory
C:\yourdirectory\
· Let (for example) column C1 contain the observed times, in increasing order, and let C2 contain the censoring status (with 1 for lifetime and 0 for censoring time).
· Activate "Enable Commands" from the menu under "Editor" at the top of the MINITAB page. Remember to click in the “Session” window first.
· The statement
MTB> %’C:\yourdirectory\TMA4275nelson.txt’ c1-c7
will then put the results in C3-C7.
TTT-plot (noncensored data)-- User’s manual
· Download the file and put it (for example) in the directory
C:\yourdirectory\
· Let (for example) column C1 contain the observed times, in increasing order. Remember: no censoring times.
· Activate "Enable Commands" from the menu under "Editor" at the top of the MINITAB page. Remember to click in the “Session” window first.
· The statement
MTB> %’C:\ yourdirectory\TMA4275tttplot.txt’ c1-c5
will then put the results in C2-C5, in the same order as in Table 11.5/9.1 in the book.
TTT-plot og
Barlow-Proschan’s test (censored
data)— User’s manual
· Download the file and put it (for example) in the directory
C:\yourdirectory\
· Let (for example) column C1 contain the observed times, in increasing order, and let C2 contain the censoring status (with 1 for lifetime and 0 for censoring time).
· Activate "Enable Commands" from the menu under "Editor" at the top of the MINITAB page. Remember to click in the “Session” window first.
· The statement
MTB> %’C:\ yourdirectory\TMA4275barlowpro.txt’ c1-c8
will then put the results in C3-C8. The column C6 contains ”total time on test” in the times where there was a failure (i.e. where column C2 is 1). The TTT-plot is a plot of the points (C7,C8). The test statistic W in Barlow-Proschan’s test is found by adding the last column (”TTT”) and not include the 1.0.