REPAIR PLOT

REPAIR PLOT

Graphics Command

Generates a plot of repair times where there may be multiple groups and a censoring time for each group.

In reliability studies, it is often necessary to analyze repair times. A first step in analyzing these repair times is to simply plot the repair data.

The repair data consists of the following:

1. The repair times.

2. A system id corresponding to each of the repair times.

3. If the test continued to run after the last failure time, then a censoring time needs to be included. Note that there should be at most one censoring time for each system.

   The Dataplot convention is to code the repair times as 1 and censoring times as 0.

The vertical coordinate is the system id and the horizontal coordinates are the repair/censoring times.

The appearance of the plot can be controlled by appropriate settings for the LINE and CHARACTER commands. The traces (i.e., curves) are defined as follows:

1. The first trace consists of all the repair times. For this trace, the line setting is typically set to a blank value while the character is set to some non-blank value.

2. If there are N systems, traces 2 through N+1 correspond to the repair and censoring times for each of these systems. The line settings are typically set to a non-blank value while the character settings are typically set to blank.

A typical sequence of commands to set the character and line settings would be

LINES SOLID ALL
CHARACTER BLANK ALL
LINE BLANK
CHARACTER *


The system id and censoring variables are optional. If you specify a censoring variable, a group variable must be given. If you have a single system with a censoring time, simply create a variable the same length as the response variable that has all values equal to 1. For example,

LET N = SIZE Y
LET GROUPID = 1 FOR I = 1 1 N

REPAIR PLOT <y> <x> <cens>
                        <SUBSET/EXCEPT/FOR qualification>
where <y> is a variable containing repair times;
            <x> is a variable containing the group id's;
            <cens> is a variable containing the censoring values;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.

This syntax is used to plot repair times for the case where there multiple systems, but there are no censoring times.

REPAIR PLOT <y> <x>             <SUBSET/EXCEPT/FOR qualification>
where <y> is a variable containing repair times;
            <x> is a variable containing the group id's;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.

This syntax is used to plot repair times for the case where there multiple systems, but there are no censoring times.

REPAIR PLOT <y>             <SUBSET/EXCEPT/FOR qualification>
where <y> is a variable containing repair times;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.

This syntax is used to plot repair times for the case where there is only a single system and there is no censoring time.

REPAIR PLOT Y BATCH CENSOR
REPAIR PLOT Y BATCH
REPAIR PLOT Y BATCH CENSOR SUBSET BATCH > 1

None

None

LINES	= Sets the type for plot lines.
CHARACTERS	= Sets the type for plot characters.
MEAN REPAIR FUNCTION PLOT	= Generates a mean repair function plot.
DUANE PLOT	= Generates a Duane plot.
KAPLAN-MEIER PLOT	= Generates a Kaplan-Meier plot.
PLOT	= Generates a data or function plot.

Reliability (Repairable Systems)

2006/10

 
skip 25
read tob312.dat  y  x  cens
.
tic offset units screen
tic offset 5 5
ylimits 1 3
major ytic mark number 3
minor ytic mark number 0
line blank
char *
title Repair Plot
y1label System ID
x1label System Age
title case asis
title offset 2
label case asis
.
repair plot y x cens