RE: Important sampling question

Hi Lisa and All,

Apologies to E.A. if her info already includes sample-size power calculation<https://www.google.com/search?q=sample+size+power+calculator&rlz=1C1GCEB_enUS853US853&oq=sample+size+power&aqs=chrome.1.69i57j0l5.10435j0j4&sourceid=chrome&ie=UTF-8>.

John

John Rochford<http://bit.ly/profile-rj>
University of Massachusetts Medical School
Eunice Kennedy Shriver Center
Director, INDEX Program
Faculty, Family Medicine & Community Health
www.DisabilityInfo.org
LinkedIn<https://www.linkedin.com/in/john-rochford/>

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From: EA Draffan <ead@ecs.soton.ac.uk>
Sent: Thursday, August 1, 2019 4:00 AM
To: lisa.seeman@zoho.com; public-cognitive-a11y-tf <public-cognitive-a11y-tf@w3.org>
Subject: RE: Important sampling question

This is a much debated subject within the research world!  It depends on so many variables as well as whether it quantitative or qualitative research etc. so all I have done is to search for some easy to reach pages on the subject.  But I have attached a paper that might help if you cannot decide on specific numbers and need to change your ideas as the research gets underway!

https://apps.who.int/medicinedocs/en/d/Js6169e/7.6.html<https://urldefense.proofpoint.com/v2/url?u=https-3A__apps.who.int_medicinedocs_en_d_Js6169e_7.6.html&d=DwMGaQ&c=WJBj9sUF1mbpVIAf3biu3CPHX4MeRjY_w4DerPlOmhQ&r=CueeOhb9CA5L2yfl16hThwCe1zS5LdHYD5MikPNgKr4&m=TPdNiS1RHRxuCKd0e9s1xS6rn4q8wy3uooCEsxggdXk&s=WxkgjrtE1Atr5-D1JItcxyhYVX46ca6wAr3RQu9glXg&e=>

https://www.ageuk.org.uk/globalassets/age-uk/documents/reports-and-publications/reports-and-briefings/guidance--sample_size_estimation_for_qualitative_methods_april2017.pdf<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.ageuk.org.uk_globalassets_age-2Duk_documents_reports-2Dand-2Dpublications_reports-2Dand-2Dbriefings_guidance-2D-2Dsample-5Fsize-5Festimation-5Ffor-5Fqualitative-5Fmethods-5Fapril2017.pdf&d=DwMGaQ&c=WJBj9sUF1mbpVIAf3biu3CPHX4MeRjY_w4DerPlOmhQ&r=CueeOhb9CA5L2yfl16hThwCe1zS5LdHYD5MikPNgKr4&m=TPdNiS1RHRxuCKd0e9s1xS6rn4q8wy3uooCEsxggdXk&s=WhUD9N1pdHDAqEduidt8QDe-c-puF7yf9Dw_M5eNFUY&e=>

https://interq-research.com/determining-sample-size-for-qualitative-research-what-is-the-magical-number/<https://urldefense.proofpoint.com/v2/url?u=https-3A__interq-2Dresearch.com_determining-2Dsample-2Dsize-2Dfor-2Dqualitative-2Dresearch-2Dwhat-2Dis-2Dthe-2Dmagical-2Dnumber_&d=DwMGaQ&c=WJBj9sUF1mbpVIAf3biu3CPHX4MeRjY_w4DerPlOmhQ&r=CueeOhb9CA5L2yfl16hThwCe1zS5LdHYD5MikPNgKr4&m=TPdNiS1RHRxuCKd0e9s1xS6rn4q8wy3uooCEsxggdXk&s=BFZMccX6-6V86if6CxGo8P7OIBg9icytCe_T0IuNmQQ&e=>


Best wishes
E.A.

Mrs E.A. Draffan
WAIS, ECS , University of Southampton
Mobile +44 (0)7976 289103
http://access.ecs.soton.ac.uk<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.outlook.soton.ac.uk_owa_redir.aspx-3FC-3D69b1RzNTDwem3wbm4pLRmuYfTLt16YjcghtEpZBsF5Sebx78I2DUCA..-26URL-3Dhttp-253a-252f-252faccess.ecs.soton.ac.uk-252f&d=DwMGaQ&c=WJBj9sUF1mbpVIAf3biu3CPHX4MeRjY_w4DerPlOmhQ&r=CueeOhb9CA5L2yfl16hThwCe1zS5LdHYD5MikPNgKr4&m=TPdNiS1RHRxuCKd0e9s1xS6rn4q8wy3uooCEsxggdXk&s=YDjMUQFSSR1pMi6S_BkA4PxhauKNpcm4zucQ8nx_ya0&e=>
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From: lisa.seeman [mailto:lisa.seeman@zoho.com]
Sent: 01 August 2019 06:49
To: public-cognitive-a11y-tf <public-cognitive-a11y-tf@w3.org<mailto:public-cognitive-a11y-tf@w3.org>>
Subject: Important sampling question

Hi Folks

I was asked an important question about sampling. Does anyone know what sample size and make up a good sample needs to have when testing for usability for people with cognitive and learning disabilities?

What do people normally do?

Are there any research papers on this? What has been found to be reliable and


All the best
Lisa Seeman

LinkedIn<https://urldefense.proofpoint.com/v2/url?u=https-3A__eur03.safelinks.protection.outlook.com_-3Furl-3Dhttp-253A-252F-252Fil.linkedin.com-252Fin-252Flisaseeman-252F-26data-3D01-257C01-257Cead-2540ecs.soton.ac.uk-257Ca9714a28105e40e0863208d716440d23-257C4a5378f929f44d3ebe89669d03ada9d8-257C0-26sdata-3D7-252BahoXcEa5bu-252FOyoKXN6tEJDWohdt-252FrYRNToa5IEOEM-253D-26reserved-3D0&d=DwMGaQ&c=WJBj9sUF1mbpVIAf3biu3CPHX4MeRjY_w4DerPlOmhQ&r=CueeOhb9CA5L2yfl16hThwCe1zS5LdHYD5MikPNgKr4&m=TPdNiS1RHRxuCKd0e9s1xS6rn4q8wy3uooCEsxggdXk&s=bJfh0tBlAwAk9b6r1hhbp8CFIfVXnfJqDDo60jkMSuU&e=>, Twitter<https://urldefense.proofpoint.com/v2/url?u=https-3A__eur03.safelinks.protection.outlook.com_-3Furl-3Dhttps-253A-252F-252Ftwitter.com-252FSeemanLisa-26data-3D01-257C01-257Cead-2540ecs.soton.ac.uk-257Ca9714a28105e40e0863208d716440d23-257C4a5378f929f44d3ebe89669d03ada9d8-257C0-26sdata-3DNaELCfVAB0NQFVm4wvwy0fCXtUlWGIeb82ESgG3jm-252Fs-253D-26reserved-3D0&d=DwMGaQ&c=WJBj9sUF1mbpVIAf3biu3CPHX4MeRjY_w4DerPlOmhQ&r=CueeOhb9CA5L2yfl16hThwCe1zS5LdHYD5MikPNgKr4&m=TPdNiS1RHRxuCKd0e9s1xS6rn4q8wy3uooCEsxggdXk&s=d8VIiAIxoqfDJLLWRBTy5KAGAlDsg57e3gOkpnvKJOw&e=>