[EpiData-list] Manipulation of Date end hour

epidata-list at lists.umanitoba.ca epidata-list at lists.umanitoba.ca
Tue Mar 13 16:40:02 CDT 2007


I would like to know how to treat(manipulate) dates and hours at the same time.
I have a data base which I seized under Epidata Entry and who understand variables dates and the hour of entrance for the delivery and date and the hour for the delivery.
The hour I made two numeric variables, the hour and minutes.
Now how to make  to have the difference in the hour or in minutes?
The problem does not settlewhen the delivery with place the same day. But the problem when there is gap
For example:
DAR      Date of arrival      <10/01/2007>
HAR      Arrival time      13
MAR      Minute of arrival      45

DAC      Dates delivery      <12/01/2007>
HAC      Hour of delivery      02
MAC      Minutes of delivery      34

Under SPSS, the manipulation is easy, I would like to know if under Epidata Analysis we can do the same with these temporal data. Should the opposite occur it would be necessary to think of introducing this module into the final version of this magnificent software.
 
___________________________________________
  Dr Jean-Paul DIBY-KONAN
  Médecin Santé Publique
  MCM Santé de la Reproduction
  Institut Médecine Tropicale
  Kapucinessenstraat 8 B-2000 Anvers
Belgique


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Objet : EpiData-list Digest, Vol 41, Issue 7

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Today's Topics:

   1. deleted and excluded records (epidata-list at lists.umanitoba.ca)
   2. Re: deleted and excluded records (epidata-list at lists.umanitoba.ca)


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Message: 1
Date: Tue, 13 Mar 2007 08:16:27 +0100 (CET)
From: epidata-list at lists.umanitoba.ca
Subject: [EpiData-list] deleted and excluded records
To: <epidata-list at lists.umanitoba.ca>
Message-ID:
    <52289.130.226.78.129.1173770187.squirrel at webmail.webhosting.dk>
Content-Type: text/plain; charset=iso-8859-1

Continued discussion on this topic:

The suggested solution I gave could be clarified:

1. Dates before year approx. 1700-1800 give problems in Analysis now, but
obviously should not. Although as everyone probably know there is a shift
around 15xx (I do not remember the exact year).

2. The suggestion:
"SUGGESTION: Would it not be possible for Analysis to assign a standard
valid value (e.g. 01/01/1900) to any invalid dates it comes across
during the read process.  "

Will be used in the next build of analysis, since it is very easy to
implement. Obviously with a message to the user.  I think this can be done
in 5 minutes of work time in the programming, whereas the optimal solution
of showing variable/field name and record is a large job - could be 1-2
days of work, since the function controlling the date value is not knowing
neither the name of the field nor the record. But I will add the issue to
the work plan for a solution at some point.

Regarding the "excluded" versus "deleted" is also easy. The user can
control whether records deleted are read or not by:
set read deleted=on
set read deleted=off

The change works only when reading the file, so if you change re-read the
file again. e.g.
set read deleted = off
read myfile
describe age
set read deleted = on
read myfile /close
describe age             // here records marked for deletion are included.

off is default. There is an error in v1 b68 in relation to this setting,
such that if you read the file with "set read deleted=off" and then do an
"update", you will see the records marked for deletion. The error has been
found and a solution will be shown in next test release.

regards
Jens Lauritsen




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Message: 2
Date: Tue, 13 Mar 2007 09:43:23 +0200
From: epidata-list at lists.umanitoba.ca
Subject: Re: [EpiData-list] deleted and excluded records
To: epidata-list at lists.umanitoba.ca
Message-ID:
    <44e66f9b0703130043t1911363ev728eaea2e245ef85 at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Thanks for the quick response to my email.

I would just like to clarify my suggestion re "excluded" and "deleted"
records.  The issue is not about whether one can control reading
deleted records or not (as Jens' response implies).  My point was that
if one is not aware that records have been deleted, it would be more
informative on reading the dataset in Analysis if the message
specifically states that x records have been deleted (and are
therefore excluded).  Using the word "excluded" suggests that Analysis
has a problem with some values and therefore has excluded the records.
 One could spend quite some time trying to identify the problem before
realising that these are merely records that have been deleted.

On the point of deleted records, is there some way in Analysis of
identifying records which had been deleted (but which one has chosen
to include in the analysis).  In EpiInfo, there was a system variable
RECDELETED.  Also, in browse/update mode, deleted records were
identifiable by an asterisk.  This was very useful in trying to sort
out why records had been deleted.

Thanks again,
Annemieke van Middelkoop


------------------------------

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