Talk:Signal-to-noise statistic

Statistics Low‑importance

	This article is within the scope of WikiProject Statistics, a collaborative effort to improve the coverage of statistics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.StatisticsWikipedia:WikiProject StatisticsTemplate:WikiProject StatisticsStatistics
Low	This article has been rated as Low-importance on the importance scale.

Mathematics Low‑priority

	Mathematics portal This article is within the scope of WikiProject Mathematics, a collaborative effort to improve the coverage of mathematics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.MathematicsWikipedia:WikiProject MathematicsTemplate:WikiProject Mathematicsmathematics
Low	This article has been rated as Low-priority on the project's priority scale.

Single source?

The particular formula here seems unusual and the one souce quoted uses the median instead of the mean as stated here. Are there other sources for a terminology defined in this way? Melcombe (talk) 16:24, 23 August 2010 (UTC)[reply]

Sum of the deviations or sum of the variances?

It seems strange to add standard deviations in the numerator. The difference of values is a random variable whose variance is the sum of the two variances. Therfore one would expect the denominator to be ${\sqrt {\sigma _{1}^{2}+\sigma _{2}^{2}}}$ rather than $\sigma _{1}+\sigma _{2}$ . --Jorge Stolfi (talk) 23:21, 10 February 2013 (UTC)[reply]