[MSDN Library April 2000] LOGEST Returns #NUM! if Y Values Are Negative or Zero (53.4523809523809%)
MSDN Library - April 2000 > Knowledge Base > Office > Excel
[MSDN Library April 2000] LOGEST (9.73077347456692%)
MSDN Library - April 2000 > Office Developer Documentation > Office 97 Documentation > Excel > Excel 97 Worksheet Functions Reference > Function Reference