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Abbreviation: |
RD |
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Command Format: |
RD Sn |
REMOVE DUPLICATES is the
most frequently used duplicate detection command. The RD command creates a set
of unique records, in which only one record from each set of duplicate
citations is retained. The format for the command is
RD Sn RD entered without a set number defaults to the last
set created.
When duplicate records are
identified, records are chosen for retention based on the order in which the
files were entered in the BEGIN command. For example, if the command BEGIN
154,72 is entered, records from File 154, MEDLINE® are given
priority over records from File 72, EMBASE®. You can change this
order of priority with the SET FILES command.
The records in the RD set
are in accession number order. Since the SORT command only works with
publication year (PY) and publication date (PD) in OneSearch, you can use the IDENTIFY
DUPLICATES (ID) command to obtain a set that is approximately sorted by title
(initial articles are ignored). Simply use the ID command with the set that
resulted from the RD command, as shown in the second group of records in the
following example.
Duplicates can be removed
from a single file, as well as from multiple files. You can also use the RD
command with the FROM option to remove duplicates FROM particular files (e.g.,
RD S3 FROM 6,8).
Records in a set created
with the RD command can be used in later search statements.
Note: If you apply the RD command to a
search that includes one or more files that do not offer duplicate detection, a
system message notifies you of that fact. The system then processes the
remaining files that do offer duplicate detection. All records from the
unsupported file(s) are retained in the RD set. Enter the HELP DUP command
online to display a list of files that do not offer duplicate detection.
• To REMOVE DUPLICATES
from a search done in OneSearch, using ID to SORT by title:
?show files;display sets File 154:MEDLINE(R) 1985-1997/Aug W3 (c) format only 1997 Dialog Corporation File 72:EMBASE 1985-1997/Jun W4 (c) 1997 Elsevier Science B.V. Set Items Description S1 643 ASPIRIN AND DIABET? S2 101 S1/ENG,1996:1997 Set Items Description --- ----- ----------- ?rd s2 ...examined 50 records (50) ...examined 50 records (100) ...completed examining records S3 70 RD S2 (unique items) ?type s3/6/all 3/6/1 (Item 1 from file: 154) 09118702 97319150 In experimental diabetes the decrease in the eye of lens carnitine levels is an early important and selective event. 3/6/2 (Item 2 from file: 154) 09109902 97243938 Outcome of unstable angina in patients with diabetes mellitus. 3/6/3 (Item 3 from file: 154) 09100806 97211065 Progression of distal symmetric polyneuropathy during diabetes mellitus: clinical, neurophysiological, haemorheological changes and self-rating scales of patients. . . . ?id s3 ...examined 50 records (50) ...completed examining records S4 70 ID S3 (sorted in duplicate order) ?type s4/6/1-4 4/6/1 (Item 1 from file: 154) 08896349 97077072 AL0671, a new potassium channel opener, inhibits nonenzymatic glycation of protein and LDL oxidation. 4/6/2 (Item 2 from file: 154) 08889522 97124614 An analysis of perioperative surgical mortality and morbidity in the asymptomatic carotid atherosclerosis study. ACAS Investigators. Asymptomatic Carotid Artheriosclerosis Study. 4/6/3 (Item 3 from file: 154) 08607141 96260029 Anticoagulation: risks and benefits in atrial fibrillation. 4/6/4 (Item 4 from file: 154) 08825920 96430980 Anticoagulation for atrial fibrillation: epidemiology informing a
difficult clinical decision.
|
Abbreviation: |
ID |
|
Command
Format: |
ID |
The IDENTIFY DUPLICATES command can be used in single or
multiple files to create a sorted set of records in which duplicates are
grouped together. The ID command allows you to easily identify duplicate
citations, while still retaining all of the records retrieved by your search.
Unlike REMOVE DUPLICATES (RD), which automatically eliminates duplicate records
from a set, the ID command does not remove records from your search results.
ID entered without a set number defaults to the last set
created.
The ID command creates a set of records that have been
approximately sorted by title. There are occasional variations to strict
alphabetical order because duplicate detection takes into consideration
alternate spellings, minor variations in titles, and leading articles, such as
"the" and "a."
By displaying the ID set, you can decide which records to
TYPE, DISPLAY, or PRINT. The SET FILES command can be used to change the order
in which records are sorted in an ID set. You can also use the ID command on a
set that has had the duplicates removed; this will sort the set alphabetically
by title.
If you typically post-process your search results (e.g.,
format them into customized bibliographies with word-processing software), you
can use the ID command to gather duplicate records and then combine them later
into a single record that contains the best feature from each record, such as
various editions of a book.
You can also use the ID command with the FROM option to
group duplicates FROM particular files (e.g., ID S3 FROM 6,8).
Note: If you apply the ID command to a search that includes one or more files
that do not offer duplicate detection, a system message will notify you of that
fact. Dialog will then process the remaining files that do offer duplicate
detection. Records from unsupported files will be retained in the ID set, but
will be sorted to the bottom of the set. A list of files not offering
duplicate detection can be obtained online by entering HELP DUP.
• To IDENTIFY DUPLICATES while using OneSearch®:
?b 72,154
07jun98 15:56:00 User306002 Session D679.3
SYSTEM:OS - DIALOG OneSearch
File 72:EMBASE 1985-1998/Jun W1
(c) 1998 Elsevier Science B.V.
File 154:MEDLINE(R) 1985-1998/Jul W4
(c) format only 1998 Dialog Corporation
Set Items Description
--- ----- -----------
?select aspirin and diabet?
25274 ASPIRIN
167271 DIABET?
S1 758 ASPIRIN AND DIABET?
?s s1/1998
758 S1
186367 PY=1998
S2 36 S1/1998
?id s2
...completed examining records
S3 36 ID S2 (sorted in duplicate order)
?type s3/6/1-5
3/6/1 (Item 1 from file: 72)
10717382 EMBASE No: 98143901
Acute coronary syndromes in the United States and United Kingdom: A
comparison of approaches
3/6/2 (Item 2 from file: 72)
10726687 EMBASE No: 98160346
Acute myocardial infarction in Switzerland: Results from the PIMICS
myocardial infarction registry
DER AKUTE MYOKARDINFARKT IN DER SCHWEIZ: RESULTATE AUS DEM PIMICS-
HERZINFARKT-REGISTER
3/6/3 (Item 3 from file: 72)
10679857 EMBASE No: 98115246
Anticoagulation to prevent stroke in atrial fibrillation and its
implications for managed care
3/6/4 (Item 4 from file: 154)
09465755 98184483
Anticoagulation to prevent stroke in atrial fibrillation and its
implications for managed care.
3/6/5 (Item 5 from file: 154)
09493275 98227654
Antioxidants diminish developmental damage induced by high glucose and
cyclooxygenase inhibitors in rat embryos in vitro.