2010年4月28日

ヒット件数 と ポスティング数 の違い

通常、Dialogで検索した場合、表示される件数は『ヒット件数』で、
該当レコード数を意味します。


ここで、Dialogには『ポスティング数』という概念もある、ってご存知ですか?

ポスティング数とは、検索語の登場回数をカウントした数です。


具体的な例で説明しましょう。
--------------------------------------------------------------------------------
? B 990 <---Newsroom Current(ファイル990)に接続

File 990:Newsroom Current Dec.1-2009/2010/Apr 27
(c) 2010 Dialog

Set Items Description
--- ----- -----------
? S iPS(W)CELL? ?
8616 IPS
513723 CELL? ?
S1 736 IPS(W)CELL? ?

? S INDUCED(W)PLURIPOTENT(W)STEM(1W)CELL? ?
154745 INDUCED
2748 PLURIPOTENT
74439 STEM
513723 CELL? ?
S2 1365 INDUCED(W)PLURIPOTENT(W)STEM(1W)CELL? ?

? DS <---DSコマンドで作成集合一覧を表示

Set Items Description
S1 736 IPS(W)CELL? ?
S2 1365 INDUCED(W)PLURIPOTENT(W)STEM(1W)CELL? ?


? SET POSTINGS ON <---ポスティング数の表示コマンド

POSTINGS set ON


? DS <---再びDSコマンド実行すると、ポスティング数が表示されます

Set Items Postings Description
S1 736 5718 IPS(W)CELL? ?
S2 1365 8362 INDUCED(W)PLURIPOTENT(W)STEM(1W)CELL? ?


? T S1/K/1 <---集合S1でKWIC形式(ヒットしたキーワードの周辺)で1件目を出力

1/K/1
DIALOG(R)File 990: Newsroom Current
(c) 2010 Dialog. All rights reserved.

Text:
...development are presented in the report 'Induced pluripotent stem cells as a
model for accelerated patient- and disease-specific drug discovery.' "Human
induced pluripotent stem (iPS) cells hold great promise for
therapy of a number of degenerative diseases such as ischemic heart failure,
Parkinson's disease, Alzheimer's disease, diabetes mellitus, sickle...

...of reprogramming exogenous transgenes, thereby converting hope into reality
for patients suffering from degenerative diseases. Patients worldwide stand to
benefit from the clinical applicability of iPS cell-based cell
replacement therapy for a number of degenerative diseases. The second is the
potential for discovering novel drugs in a high throughput manner using
patient-specific iPS cell-derived somatic cells possessing the
etiology of the specific disease. The third is their suitability for
toxicological testing of drugs and environmental factors," wrote I...

The researchers concluded: "This review focuses on these potential applications
of iPS cells with special emphasis on recent updates of iPS
cell
research contributing to the accelerated drug discovery."

Gunaseeli and colleagues published their study in Current Medicinal Chemistry
(Induced pluripotent stem cells as a model for...
--------------------------------------------------------------------------------
上記のレコードの場合、キーワード「iPS cell」は5回登場していますので、
ポスティング数は、5 とカウントされます。