Shared units/coupling

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Shared units/coupling
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Task Find shared references among papers
Use this file which is in upper-lower case and
only one author initial to somewhat reduce
spelling variants
Run Analyze/Shared units/coupling/Shared units
Note to reduce n of coupled pairs you may set min
number of shared units to be printed in the Min
number box.
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The cou-file has shared references in 1st column
and doc numbers in 2nd and 3rd
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Assume you want to add labels to the doc numbers.
If author names (they often are many on each
papers and they need to be standardized)1. Make
a new outfile based on AU-field2. Run Edit
out-files/Convert Upper Lower Case/Good for
author cited author in out-file3. Run Edit
out-files/Keep only authors 1st initial4.
Select the 1st-file and then double click here,
indicate the source of labels to add.
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5. Select the cou-file6. Run Add data
classify/Add labels to freq-docnr-docnr
pairs/making freq-label-label7. Answer Yes to
swap (no direction here!)8. Answer Yes to delete
self-related pairs (if you wish!)9. Answer Yes
to delete pairs with overlapping sets (if you
wish!)
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Now, the cdd-file has authors names instead of
doc numbers for the pairs as defined in the
previous steps (7, 8 , 9)
Next, run Analyze/Add frequencies to sum all
shared references for a given pair (that may
occur several times)
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The cit-file has it!
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Run Edit out-files/Sort numeric/descending by
first column, and you will get this!
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NoteBefore mapping with Pajek you could reduce
the pairfile to the most productive authors. Put
the names in the list, type a new filename in the
box Type new file name here. Select the
pair-file and run Analyze/Select pairs from
pairlist.
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Note For normalization purposes you can add
number of references to the cou-file1. Make an
out-file bases on the NR-field (number of
references)2. Put the out-file in Type new file
name here3. Select the cou-file and run Add data
classify/Add labels to freq-docnr-docnr/making
freq-docnr-label-docnr-label4. This will make
the ad2-file and open it in Excel and calculate
Saltons index as a normalized measure of
coupling strength, e.g. for the first pair
69/(157132)1/2