OUT= Schedule Data Set
The Schedule data set always contains the variables in the
Activity data
set that are listed in the TAILNODE, HEADNODE,
ACTIVITY,
SUCCESSOR,
DURATION, and ID statements.
If the INTPER= option is specified in
the PROC CPM statement, then the values of the DURATION variable in the
Schedule data set are obtained by multiplying the corresponding values
in the Activity data set by intper. Thus,
the values in the Schedule data set are
the durations used by PROC CPM to compute the schedule.
If the procedure is used without specifying a RESOURCEIN=
data set and only the unconstrained schedule is obtained, then
the Schedule data set contains six new variables named
E_START, L_START, E_FINISH, L_FINISH, T_FLOAT, and F_FLOAT.
If a resource-constrained schedule is obtained, however, the
Schedule data set contains two new variables
named S_START and S_FINISH; the
T_FLOAT and F_FLOAT variables are omitted. You can request the omission
of the E_START and E_FINISH variables by specifying NOE_START and
the omission of the L_START and L_FINISH variables by specifying
NOL_START in the RESOURCE statement.
The variables listed in the RESOURCE statement are also
included in the Schedule data set; to omit them, use the
NORESOURCEVARS option in the RESOURCE statement. If the DELAYANALYSIS
option is specified, the Schedule data set also includes the
variables R_DELAY, DELAY_R and SUPPL_R.
If resource driven durations or resource calendars are in effect,
the start and finish times shown in the Schedule data set are computed
as the minimum of the start times for all resources for that activity
and the maximum of the finish times for all resources for that
activity, respectively. For details see the "Resource-Driven Durations and Resource Calendars" section.
If an ACTUAL statement is specified, the Schedule data set also contains
the four variables: A_START, A_FINISH, A_DUR, and STATUS.
The format of the schedule variables in this data set (namely,
A_START, A_FINISH, E_START, E_FINISH, L_START, and so on)
is consistent with the format of the
DATE= specification and the INTERVAL= option in the PROC CPM statement.
Each observation in the Schedule
data set is associated with an activity. The variables in the data
set have the following meanings.
- A_DUR
-
specifies the actual duration of the activity.
This variable is included in the
Schedule data set only if the ACTUAL statement is used. The value for this
variable is missing unless the
activity is completed and may be different from
the duration of the activity as specified by the DURATION variable.
It is based on the values of the progress variables. See
the "Progress Updating" section for further details.
- A_FINISH
-
specifies the actual finish time of the activity,
either as specified in the
Activity data set or as computed by PROC CPM on the basis of the progress
variables specified. This variable is included in the Schedule data set
only if the ACTUAL statement is used.
- A_START
-
specifies the actual start time of the activity, either as specified in the
Activity data set or as computed by PROC CPM on the basis of the
progress variables specified. This variable is included in the Schedule
data set only if the ACTUAL statement is used.
- E_FINISH
-
specifies the completion time if the activity is started at the early
start time.
- E_START
-
specifies the earliest time the activity can be started.
This is the maximum of the
maximum early finish time of all predecessor activities and any lower
bound placed on the start time of this activity by the alignment
constraints.
- F_FLOAT
-
specifies the free float time, which is
the difference between the early finish time of the
activity and the minimum early start time of the activity's immediate
successors. Consequently, it is the maximum delay that can be tolerated
in the activity without affecting the scheduling of a successor
activity.
- L_FINISH
-
specifies the latest completion time of the activity. This is
the minimum of the
minimum late start time of all successor activities and any upper
bound placed on the finish time of the activity by the alignment
constraints.
- L_START
-
specifies the latest time the activity can be started. This is computed from the
activity's latest finish time.
- S_FINISH
-
specifies the resource-constrained finish time of the activity.
If resources are insufficient and the procedure cannot schedule
the activity, the value is set to missing, unless the FILLUNSCHED option
is specified.
- S_START
-
specifies the resource-constrained start time of the activity.
If resources are
insufficient and the procedure cannot schedule
the activity, the value is set to missing, unless the FILLUNSCHED
option is specified.
- STATUS
-
specifies the current status of the activity. This is a character
valued variable.
Possible values for the
status of an activity are Completed, In
Progress, Infeasible or Pending;
the meanings are self-evident. If the project is
scheduled subject to resource constraints, activities
that are Pending are
classified as Pending or
Infeasible depending on whether
or not PROC CPM is able to determine
a resource-constrained schedule for the
activity.
- T_FLOAT
-
specifies the total float time, which is the
difference between the activity late finish time and early
finish time. Consequently, it is the maximum delay that can
be tolerated in performing the activity and still complete
the project on schedule. An activity is said to be on the critical
path if T_FLOAT=0.
If activity splitting is allowed during resource-constrained
scheduling, the Schedule data set may contain more than one observation
corresponding to each observation in the Activity data set. It will
also contain the variable SEGMT_NO, which is explained in
the "Activity Splitting" section.
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.
