The Invader: A Tale of Adventure and Passion is a novel by the Welsh author Hilda Vaughan. It was published in 1928 by Heinemann in the UK and by Harper & Brothers in the US.
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{"type":"standard","title":"Allan variance","displaytitle":"Allan variance","namespace":{"id":0,"text":""},"wikibase_item":"Q1440227","titles":{"canonical":"Allan_variance","normalized":"Allan variance","display":"Allan variance"},"pageid":40708,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/AllanDeviation.svg/330px-AllanDeviation.svg.png","width":320,"height":282},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/AllanDeviation.svg/535px-AllanDeviation.svg.png","width":535,"height":471},"lang":"en","dir":"ltr","revision":"1280560781","tid":"345d3ed9-016f-11f0-9d64-3c127e7863ae","timestamp":"2025-03-15T07:29:18Z","description":"Measure of frequency stability in clocks and oscillators","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Allan_variance","revisions":"https://en.wikipedia.org/wiki/Allan_variance?action=history","edit":"https://en.wikipedia.org/wiki/Allan_variance?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Allan_variance"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Allan_variance","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Allan_variance","edit":"https://en.m.wikipedia.org/wiki/Allan_variance?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Allan_variance"}},"extract":"The Allan variance (AVAR), also known as two-sample variance, is a measure of frequency stability in clocks, oscillators and amplifiers. It is named after David W. Allan and expressed mathematically as .\nThe Allan deviation (ADEV), also known as sigma-tau, is the square root of the Allan variance, .","extract_html":"
The Allan variance (AVAR), also known as two-sample variance, is a measure of frequency stability in clocks, oscillators and amplifiers. It is named after David W. Allan and expressed mathematically as ![](\"https://wikimedia.org/api/rest_v1/media/math/render/svg/71ebe307f320d69e748fefc6b1d8bd07efcb139d\")