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    Types: TextFileVerbose
    Names: »specifik«

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>a1 STATISTICS
>a2 Introduction
This is a result of an analysis  of the statistic feature that
should be included in the DA-system.

The basic idea is that the user through a 
>ul
dialog
with the system retrieves the statistic information that he wants.

He first has to set up a
>ul
statistic frame
i.e. a frame within the statistic should be produced. The frame
includes the
>ul
period of time
of the statistic, the
>ul
set of information
used to calculate the figures.

The statistics are ordered in one of two 
>ul
modes,
the
>ul
fixed
mode and the
>ul
free
mode.

In the 
>ul
fixed
mode (default) the user
>ul
selects
some system defined standard statistics.

In the
>ul
free
mode the user
>ul
constructs
his own special statistics by means of the available
>ul
statistic primitives
i.e. the total set of calculated figures inside the given frame.

>a2 The statistic frame
>a3 Introduction
Whenever you want to make statistics on some subject you have to know
>ul
the history of the subject.
The part of the history of the subject that is
>ul
relevant
when making some statistic, we will call
>ul
the statistic frame.

The statistic frame is specified by two subjects. These are
>ul
the period of time of the history
that should be covered by the statistic and the 
>ul
set of information
(part of the information of the history) on which the figures of the
statistics are calculated.

>a3 The history of the DA-system
The DA-system includes a LOG-PROCESS, which produces a
>ul
total history of the system
on a so-called LOGFILE.

The history consists of records of information about each retrieval
from each operator position and from each operator. These records
of information are sorted in time.

>a3 Specifying the statistic frame
In order to specify the statistic frame the user has to state the
period of time and the set of information.

>a4 The period of time
The period of time is specified as a date interval and a time interval.

>ex 81.03.03 - 81.03.08
    9.00 - 12.00

designates that the period of time of the history covered by the
statistics is March 3rd - March 8th 1981 from 9.00 to 12.00.

If the date interval is omitted the actual date is assumed.

If the time interval is omitted the interval 0.00 - 24.00 is assumed.

>a4 The set of information
The figures of the statistics will be calculated on information
extracted from the part of the history specified byt the period of time.

Sometimes the whole information is not relevant. If for example a
statistic only concerning the search inquiries handled by the system
is wanted all information about other types of inquiries are 
irrelevant, or if a statistic only concerning the work done by a
special group is wanted all information about other groups are
«eof»