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Data Management Seminar, 9-12th July 2007, Hamburg
WinDEM - Merge FilesWinDEM - Merge Files
Data Management Seminar, 9-12th July 2007, Hamburg
Purpose of this Presentation
Merge WinDEM Data Files
When is it neccessary?How can it be done technically? What has to be taken into account?
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Data Management Seminar, 9-12th July 2007, Hamburg
Merge WinDEM Data Files
Example: Imagine you have entered some
students' questionnaire data of your country
in two different files:
Filename No. of cases
Puncher ID
ISGDEUF2.dbf
8 111
ISGNATF2.dbf 7 222
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Data Management Seminar, 9-12th July 2007, Hamburg
Merge WinDEM Data Files
WinDEM File
(ISGDEUF2.dbf)
Puncher ID 111
WinDEM File
(ISGNATF2.dbf)
Puncher ID 222
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Data Management Seminar, 9-12th July 2007, Hamburg
Merge WinDEM Data Files
Puncher ID 111 Puncher ID 222
WinDem File(ISGDEUF2.dbf)
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Data Management Seminar, 9-12th July 2007, Hamburg
Merge WinDEM Data Files
Merging data files is only neccessary if you entered the same type of data in more than one data file.
NOTE:
Merging data files should be done before final data cleaning.
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Data Management Seminar, 9-12th July 2007, Hamburg
How to open the Table View?Sidebar
Merge WinDEM Data Files
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Data Management Seminar, 9-12th July 2007, Hamburg
ISGDEUF2.dbf
(file to be merged)
(main file)
ISGNATF2.dbf
All students from school
8502
All students from school
8001
Merge WinDEM Data Files
The codebooks corresponding to the files must have exactly the same structure.
NOTE:
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Data Management Seminar, 9-12th July 2007, Hamburg
Merge Data Files – Process
To merge two data files in WinDEM, you need to open the CODEBOOK of the first (main) file:
ISGDEUF2.sdb
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Data Management Seminar, 9-12th July 2007, Hamburg
Merge Data Files – Process
Please select a codebook with a corresponding data file in the appropriate path.
You will get a message that informs you about the already existing data file.
Click „OK“ to proceed.
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Data Management Seminar, 9-12th July 2007, Hamburg
Merge Data Files – Process
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Select Import > WinDEM from the “Import/Export” menu
Open the data file to be merged
Data Management Seminar, 9-12th July 2007, Hamburg
The records from ISGDEUF2.dbf and ISGNATF2.dbf have been merged now.
Merge Data Files – Result
The data file ISGDEUF2.dbf now consists of 15 records (8+7).
The merged data file will automatically take the name of the open codebook (in our example ISGDEUF2.dbf).
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Data Management Seminar, 9-12th July 2007, Hamburg
Merge Data Files – Result
Once you have merged the files, the combined data file (main file) will appear as follows:
Records from main file
(ISGDEUF2.dbf)
Records from imported file
(ISGNATF2.dbf)13
Data Management Seminar, 9-12th July 2007, Hamburg
If you want to keep a copy of the original file (here: ISGDEUF2.dbf), save it (and its codebook) under a different name BEFORE you perform data merging!
Although you may have checked the individual files BEFORE merging and no problems were found, it is recomended that you repeat the check on duplicated records (Unique ID check) for the merged file!
Merge Data Files
NOTE:
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Data Management Seminar, 9-12th July 2007, Hamburg15
Thank you!Thank you!