May 2008 - EpiData-list - University of Manitoba Mailing Lists

If..then
by epidata-list＠lists.umanitoba.ca 10 Jun '08

10 Jun '08

Hi, might be easy question, i am trying to write condition under check file to write value of 9 in 2 places if one cell equal to NA (code below), it does not work (and no error message), any tips? AFTER ENTRY IF v64=NA THEN LET V65=9 & V66=9 & goto V67 ENDIF Thank you in advance best regards ziad

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Re: EpiData-list Digest, Vol 55, Issue 19 Missing values is not NA
by epidata-list＠lists.umanitoba.ca 29 May '08

29 May '08

Dear friend Ziad, NA is common expression to identify missing values. If you are working with R or S-Plus then NA is NA. That means that all functions or commands that you want to specify NA, the expression is also NA. However, in Stata or Epidata entry the NAs are epecified by dots (.) and sometimes by empty quotes (" ") depending if the variable of interest is formated as numeric or text. So, my guess is that your check command will work fine if do like this... AFTER ENTRY IF v64=. THEN LET V65=9 & V66=9 & goto V67 ENDIF END Best regards, Pedro Emmanuel > Today's Topics: > > 1. If..then (epidata-list(a)lists.umanitoba.ca) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 28 May 2008 08:47:34 -0700 > From: epidata-list(a)lists.umanitoba.ca > Subject: [EpiData-list] If..then > To: epidata-list(a)lists.umanitoba.ca > Message-ID: > <897a5cf60805280847u3b99c66ak6f49e3855b879141(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > Hi, > might be easy question, i am trying to write condition under check > file to write value of 9 in 2 places if one cell equal to NA (code > below), it does not work (and no error message), any tips? > > AFTER ENTRY > IF v64=NA THEN > LET V65=9 & V66=9 & goto V67 > ENDIF > > > Thank you in advance > best regards > ziad > > > ------------------------------ > > ________________________________________ > EpiData-list(a)lists.umanitoba.ca > http://lists.umanitoba.ca/mailman/listinfo/epidata-list > > > End of EpiData-list Digest, Vol 55, Issue 19 > ******************************************** >

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re: If..then
by epidata-list＠lists.umanitoba.ca 28 May '08

28 May '08

Just split in three lines: after entry IF v64=NA THEN LET V65=9 V66=9 goto V67 ENDIF regards Jens Lauritsen EpiData Association

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Epidata Analysis and diagnostic test accuracy analysis
by epidata-list＠lists.umanitoba.ca 27 May '08

27 May '08

Hi all, I did look at epidata website but for any unknown reasean I could not find the pdf manual of EpiData analysis. I use a lot the epidata entry but neve tryed before the analysis. I would like to know if any of you could tell me if EpiData analysis has resources to analyse diagnostic test accuracy such as sensitivity, specificity (and theses estimates in different prevalences), estimate the area under the ROC curve, draw ROC curves, compare ROC curves form different tests? I also did try to download/install the software and look for theses abilaties, but here at the institute where I work none of the users are coputers administrator (security reasons) and install "non standart softwares" is just not that simple! Thanks a lot in advance! -- Abraço forte e que a força esteja com você, Pedro Emmanuel

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Re: [EpiData-list] Program simulated data in EpiData (Analysis)
by epidata-list＠lists.umanitoba.ca 25 May '08

25 May '08

Greetings SK, [This may be a repeat -- first posting didn't seem to get through] I like to use a little program by Christian Maas to generate data, Random file generator from: http://www.chmaas.handshake.de/delphi/freeware/freeware.htm The command line version can be run from a BAT file containing a statement such as: RndFileC.exe /R=50000 /Z=YYYY/MM/DD /N=4 /F=1,@ /C=15 /F=1,, /B /C=1 /S=14 /B /C=1 /S=14 /F=1,@ /Y=1945,2003 data.txt For example, this generates 50,000 records with the given date format and range, plus other fields. Then import into EpiData. I prefer to set up the EpiData files, enter a few records, and then export them to a CSV file; then make sure you use the same format to generate the random records to import back into EpiData. I have use Maas's program to generate 8,000,000 records (but not this number for EpiData; this was data to analyze using gawk in GNU/Linux). The sort program is real nice, too. Hope this helps, Pete Geddes geddes(a)ix.netcom.com ----- Original Message --------------- Subject: [EpiData-list] Program simulated data in EpiData (Analysis) From: epidata-list(a)lists.umanitoba.ca Date: Sun, 25 May 2008 09:38:58 -0400 To: epidata-list(a)lists.umanitoba.ca > >Dear All > >I was wondering if EpiData Analysis could do simulations: here is what I am contemplating doing; I have created a database of admissions/discharges from a hospital using a standardized register and using EpiData as the software for data entry and ana;ysis. I wish to populate the fields (15 in total, of various types: boolean, categorical with k values, numeric, and date fields) I have created with say N=5,000 observations. The reason I wish to do this is to show the stakeholders (in this case Hospital Managers and Unit Heads) that one could use simple yet effective data entry and analysis software (like EpiData) to monitor and evaluate hospital-based programs. I wanted them to see EpiData in action with the simulated data--starting with EpiData Entry and then with Analysis. > > > >Can simulation be done in Analysis? or should I prepare the dataset with Stata or SAS and then import in EpiData--I am not sure how to do this, but I will search around to see how to get it done? > > > >Thanks, > >SK >

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How to: Simulation with EpiData Analysis
by epidata-list＠lists.umanitoba.ca 25 May '08

25 May '08

Simulation for entry is not that easy. But some tests have been done with "recording software". The results of this could be uploaded if there is an interest. Simulation for analysis is rather simple. The simplest way is: close * generate x empty observations, e.g. 1000: generate 1000 * then generate the variables: e,g, integer sex: gen i sex = 1 if recnumber > 499 then sex = 0 .... continue with other variables. * look also in the help file for: random functions. The extended way is to use the user specified commands. For explanation of this see: The documentation page or the direct download link at: http://www.epidata.dk/php/downloadc.php?file=cmd_command_epidata_analysis.p… Kind regards Jens Lauritsen EpiData Association

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Program simulated data in EpiData (Analysis)
by epidata-list＠lists.umanitoba.ca 25 May '08

25 May '08

Dear All I was wondering if EpiData Analysis could do simulations: here is what I am contemplating doing; I have created a database of admissions/discharges from a hospital using a standardized register and using EpiData as the software for data entry and ana;ysis. I wish to populate the fields (15 in total, of various types: boolean, categorical with k values, numeric, and date fields) I have created with say N=5,000 observations. The reason I wish to do this is to show the stakeholders (in this case Hospital Managers and Unit Heads) that one could use simple yet effective data entry and analysis software (like EpiData) to monitor and evaluate hospital-based programs. I wanted them to see EpiData in action with the simulated data--starting with EpiData Entry and then with Analysis. Can simulation be done in Analysis? or should I prepare the dataset with Stata or SAS and then import in EpiData--I am not sure how to do this, but I will search around to see how to get it done? Thanks, SK

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Default values in boolean fields
by epidata-list＠lists.umanitoba.ca 22 May '08

22 May '08

The simplest solution for default values is to use the chk command "Defaultvalue" Further explanation is shown in the help file. eg qes: v1 my boolean variable <y> v2 ....... etc chk v1 defaultvalue 0 end regards Jens Lauritsen

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improvised checkboxes
by epidata-list＠lists.umanitoba.ca 21 May '08

21 May '08

I understand that epiData does not have checkboxes as such. Therefore the boolean fieldtype is suggested. In order to save time when entering data for certain variables, I would like to have epiData automatically write N, if nothing is entered. Otherwise all dummy variables are created as missing, unless I type "0" or "N" in each field. Is there a way to do this automatically? I already tried MISSINGVALUE N or MISSINGVALUE 0 and AFTER RECORD IF saaadr = . THEN saaadr=0 ENDIF END but unfortunately with no result. Thanks in advance for any suggestion. Marius _________________________________________________________________ News, entertainment and everything you care about at Live.com. Get it now! http://www.live.com/getstarted.aspx

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Alyshia Landry is out of the office.
by epidata-list＠lists.umanitoba.ca 16 May '08

16 May '08

I will be out of the office starting 05/16/2008 and will not return until 05/20/2008. If you require immediate assistance, please contact Celina Sousa at extension 5300. Thank-you and have a nice weekend, Alyshia

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