The GANTT Procedure

Example 8.3 Marking Holidays

This example uses the widget manufacturing project introduced in Chapter 4, The CPM Procedure. The data sets used in this example are the same as those used in Example 4.8 to illustrate holiday processing in PROC CPM. The WIDGET data set describes the project in AON format. The variable TASK identifies the activity and the variables SUCC1, SUCC2, and SUCC3 identify the successors to TASK. The variable DAYS defines the duration of an activity. Another data set, HOLIDAYS, defines the holidays that need to be taken into account when scheduling the project. Although the HOLIDAYS data set contains three variables HOLIDAY, HOLIFIN, and HOLIDUR, the HOLIDUR variable is not used in this example. Thus, the Christmas holiday starts on December 24, 2003, and finishes on December 26, 2003. PROC CPM schedules the project to start on December 1, 2003, and saves the schedule in a data set named SAVEH. This data set is shown in Output 8.3.1.

Next, the GANTT procedure is invoked with the specification of HOLIDATA= HOLIDAYS in the PROC GANTT statement and the HOLIDAY= and HOLIEND= options in the CHART statement, causing the Christmas and New Year holidays to be marked on the chart. The resulting Gantt chart is shown in Output 8.3.2. Note that the procedure marks the duration of the holiday with the pattern corresponding to the seventh PATTERN statement. (See the section Graphics Examples for a list of the pattern statements used in the examples.)

options ps=60 ls=80;

title h=2 'Gantt Example 3';
title2 'Marking Holidays';

/* Activity-on-Node representation of the project */
data widget;
   format task $12. succ1-succ3 $12. ;
   input task & days succ1 & succ2 & succ3 & ;
   datalines;
Approve Plan   5  Drawings      Study Market  Write Specs
Drawings      10  Prototype     .             .
Study Market   5  Mkt. Strat.   .             .
Write Specs    5  Prototype     .             .
Prototype     15  Materials     Facility      .
Mkt. Strat.   10  Test Market   Marketing     .
Materials     10  Init. Prod.   .             .
Facility      10  Init. Prod.   .             .
Init. Prod.   10  Test Market   Marketing     Evaluate
Evaluate      10  Changes       .             .
Test Market   15  Changes       .             .
Changes        5  Production    .             .
Production     0  .             .             .
Marketing      0  .             .             .
;

data holidays;
   format holiday holifin date7.;
   input holiday & date7. holifin & date7. holidur;
   datalines;
24dec03  26dec03  4
01jan04  .        .
;

* schedule the project subject to holidays;
proc cpm data=widget holidata=holidays
         out=saveh date='1dec03'd ;
   activity task;
   succ     succ1 succ2 succ3;
   duration days;
   holiday  holiday / holifin=(holifin);
   run;

* sort the schedule by the early start date ;
proc sort;
   by e_start;
   run;

* print the schedule;
proc print data=saveh;
   var task days e_start e_finish l_start l_finish
       t_float f_float;
   run;

Output 8.3.1 Schedule Data Set SAVEH

Gantt Example 3

Marking Holidays

Obs	task	days	E_START	E_FINISH	L_START	L_FINISH	T_FLOAT	F_FLOAT
1	Approve Plan	5	01DEC03	05DEC03	01DEC03	05DEC03	0	0
2	Drawings	10	06DEC03	15DEC03	06DEC03	15DEC03	0	0
3	Study Market	5	06DEC03	10DEC03	09JAN04	13JAN04	30	0
4	Write Specs	5	06DEC03	10DEC03	11DEC03	15DEC03	5	5
5	Mkt. Strat.	10	11DEC03	20DEC03	14JAN04	23JAN04	30	30
6	Prototype	15	16DEC03	03JAN04	16DEC03	03JAN04	0	0
7	Materials	10	04JAN04	13JAN04	04JAN04	13JAN04	0	0
8	Facility	10	04JAN04	13JAN04	04JAN04	13JAN04	0	0
9	Init. Prod.	10	14JAN04	23JAN04	14JAN04	23JAN04	0	0
10	Evaluate	10	24JAN04	02FEB04	29JAN04	07FEB04	5	5
11	Test Market	15	24JAN04	07FEB04	24JAN04	07FEB04	0	0
12	Marketing	0	24JAN04	24JAN04	13FEB04	13FEB04	20	20
13	Changes	5	08FEB04	12FEB04	08FEB04	12FEB04	0	0
14	Production	0	13FEB04	13FEB04	13FEB04	13FEB04	0	0

* plot the schedule;
proc gantt holidata=holidays data=saveh;
   chart / holiday=(holiday) holiend=(holifin);
   id task;
   run;

Output 8.3.2 Marking Holidays on the Gantt Chart