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{{Infobox Software
| name = nQuery Sample Size Software
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| genre = [[Sample size determination|Sample Size]]
[[Statistical power|Statistical Power Calculation]] [[Statistical hypothesis testing|Statistical Hypothesis Testing]]
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| website = {{URL|www.statsols.com}}
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'''nQuery Sample Size Software''' is statistical software used to calculate [[Sample size determination|Sample size]] and [[Statistical power]]. It is most commonly used by Biostatisticians to determine how many people are needed to enroll into a [[Clinical trial]].
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==nQuery history==
[[Janet D. Elashoff|Janet Dixon Elashoff]] is a now-retired American statistician and daughter of the mathematician and statistician [[Wilfrid Dixon|Wilfrid Joseph Dixon]], creator of BMDP. J. Elashoff is also the retired Director of the Division of Biostatistics, [[Cedars-Sinai Medical Center]]. While at [[University of California, Los Angeles|UCLA]] and Cedars-Sinai during the 1990s, she wrote the program nQuery Sample Size Software (then known as nQuery Advisor). This quickly became widely used to estimate the sample size requirements for pharmaceutical testing and she joined the company Statistical Solutions LLC to commercialize it.<ref name=cherfriis>{{citation|title=Introductory Biostatistics for the Health Sciences: Modern Applications Including Bootstrap|series=Wiley series in probability and statistics|first1=Michael R.|last1=Chernick|first2=Robert H.|last2=Friis|publisher=John Wiley & Sons|year=2003|isbn=9780471458654|page=360|url=https://books.google.com/books?id=QRwuz6yA97oC&pg=PA360}}</ref>
==nQuery featured in scientific journals ==
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