This is a very basic question.
1) I am not able to automatically calculate the number of hours from the calculate option. I have input date and time and entered it into the calculate option but it is not giving me the correct answer. e.g. I have input date of injury and time of injury; and date of presentation and time of presentation. I need to calculate the number of hours of delay in presentation. I am not able to do that.
2) Is it possible to change the time option and exclude the seconds?
Thank you,
With regards,
Madhurita
Dear all
When comparing two datasets with Epidata Manager (double entry) I receive the error: "index out of bounds 108". Does somebody know what this means?
Thank you very much, Nicole
Dr. med. Nicole Bender
Senior Research Fellow
Evolutionary Morphology and Adaptation Group
Institute of Evolutionary Medicine (IEM)
University of Zurich
Winterthurerstrasse 190
CH-8057 Zurich, Switzerland
Office Y42 G86b
Phone +41 44 635 05 31, Fax: +41 44 635 57 02
nicole.bender(a)iem.uzh.ch
http://www.iem.uzh.ch/en/people/admin/Nicole-Bender.html
Dear Jens, It is heartening to see the Epidata Analysis development progressing. Our favourite “qes/chk/rec” file systm seems fading on the horizon. Our old applications are still functional in Classic Epidata Entry. It is comparatively easy to upgrade to the new”epx” file if one is using the FLAT file. However, the relational “rec” files cannot be upgraded to the new ”epx” file. There was a line written in the mail that one can read “rec” file but not write it in the new Epidata Analysis. Hence I request you to kindly preserve the read and merge (rec files) commands in the new Epidata Analysis.The Command and Function Reference Guide 2.1 is fairly exhaustive. Command “Merge” is perhaps not introduced in the prototype version, hence not mentioned in the Command and Function Reference Guide.It is possible to generate by the available Graphics in the Epidata Analysis ver 2.2.3 (build 187) by command syntax generated by using “Diaglogue boxes”. Available options in the graphical output are excellent. However some tweaking is still required to get the final graph. PGMs is a wonderful feature with infinite possibilities. Gratitude to Epidata team for the sustained effort .With regards,Dr. Shavinder Singh
Exciting News
Today we have released a test version of the rewritten analysis, which
for the first time approaches functionality resembling the final first
version to be released later.
You may download the test version from http://www.epidata.dk/testing.php
Please notice that it is still premature to use the new analysis for
production every day use, but we urge users to challenge the new
analysis. You could for instance replicate data-management procedures
you do with ordinary Classic Analysis v2.2. rel 3 (Build 187)
The intention is to release the new analysis for production when the
following has been developed: A: all functionality for data management
(new projects, new variables, labels and editing of these). B: append
and merge. C: basic reporting - e.g. for logfile overview
Already now you may test many of these aspects. After download and
unzipping (files are provided in zipped archives) you will see the
commands and syntax documentation.
We attempt to maintain the same syntax that you know, but to allow for
the modernization some changes are needed: e.g. read and write epx, csv
and dta files ; work on all operating systems (Linux, Mac, Windows) ;
accept UTF-8; extend with special functions; sort data; manage encrypted
data. You can read rec files, but not write them. Use epx for saving data.
We also aim for standardization across commands. E.g. number of decimals
in output is always !Dx, where x is the number of decimals 0,1,2 etc.
For data analysis these commands are implemented: count , means, freq,
Some changes: use := instead of = . Put texts in " " . End all command
lines with ;. Selection works on a single block. Options are mentioned
with ! instead of /.
Some enhancements: A copy of all executed commands is saved
(commandlog.pgm). Recent pgm in editor filelist. Multiple pgm sorting
ascending and descending and more. See datasets (F2) in a project. Open
encrypted files.
A frequency table of v17:
freq v17 !vl !cum ; // would show labels and values plus
cumulative percentage.
To do the same table among those younger than 40 with no decimals.
select (age < 40) do freq v17 !vl !d0;
To remove all observations with age above 68. Use the command drop:
select (age> 68) do drop data;
A new construct is a loop, e.g. :
new global integer i ;
for i:=1 to 5 do ? "This is a number counting: " + i ;
Which can be used to show means or frequencies for subgroups of another
variable:
new global integer i ;
for i:= 1 to 5 do select (area = i) do means age !by:=sex !t;
Please challenge function within WHAT is already implemented. Also
notice that output format is still rather crude. Rest assured more will
come during autumn. But do remember that you should NOT use production
data - work on copies of real data.
Please also discuss function and problems on this list.
Best wishes for fruitful testing
Torsten Christiansen
Jens Lauritsen
EpiData Association, Denmark