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Tv, Perneger; Chamot, Eric; Etter, Jean‐François; Jl, Richard; Gallant, Sheryle J.; Ricciardi, Paola; Iten, Anne; Burnand, Bernard

doi:10.1023/a:1008965321161

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…Likelihood ratios and corresponding tests have been shown to be a very understandable approach of specifying evidence [37]. They also have the advantage of specifying a clear value (i.e., the likelihood ratio) with can give us intuitive meaning about the advantage of one model over the other.…”

Section: Likelihood Methodsmentioning

confidence: 99%

Detecting Memory and Structure in Human Navigation Patterns Using Markov Chain Models of Varying Order

et al. 2014

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One of the most frequently used models for understanding human navigation on the Web is the Markov chain model, where Web pages are represented as states and hyperlinks as probabilities of navigating from one page to another. Predominantly, human navigation on the Web has been thought to satisfy the memoryless Markov property stating that the next page a user visits only depends on her current page and not on previously visited ones. This idea has found its way in numerous applications such as Google's PageRank algorithm and others. Recently, new studies suggested that human navigation may better be modeled using higher order Markov chain models, i.e., the next page depends on a longer history of past clicks. Yet, this finding is preliminary and does not account for the higher complexity of higher order Markov chain models which is why the memoryless model is still widely used. In this work we thoroughly present a diverse array of advanced inference methods for determining the appropriate Markov chain order. We highlight strengths and weaknesses of each method and apply them for investigating memory and structure of human navigation on the Web. Our experiments reveal that the complexity of higher order models grows faster than their utility, and thus we confirm that the memoryless model represents a quite practical model for human navigation on a page level. However, when we expand our analysis to a topical level, where we abstract away from specific page transitions to transitions between topics, we find that the memoryless assumption is violated and specific regularities can be observed. We report results from experiments with two types of navigational datasets (goal-oriented vs. free form) and observe interesting structural differences that make a strong argument for more contextual studies of human navigation in future work.

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Section: Likelihood Methodsmentioning

confidence: 99%

Detecting Memory and Structure in Human Navigation Patterns Using Markov Chain Models of Varying Order

et al. 2014

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“…El presente estudio, aplicando los procedimientos estadísticos apropiados a escalas como la COOP/WONCA, encuentra, a diferencia de los estudios previos8, 13, que se trata de una escala unifactorial que mide un único constructo latente. Este resultado se obtiene tras la aplicación de 2 métodos diferentes y la solución unifactorial encontrada explica una proporción de la variancia muy por encima de los mínimos exigidos (70%) 22 , lo que significa que queda poca información que no pueda ser explicada por ese único factor.…”

Section: Discussionunclassified

“…Este resultado se obtiene tras la aplicación de 2 métodos diferentes y la solución unifactorial encontrada explica una proporción de la variancia muy por encima de los mínimos exigidos (70%) 22 , lo que significa que queda poca información que no pueda ser explicada por ese único factor. La distribución de las respuestas a los ítems no difiere sensiblemente de la obtenida previamente en la misma población 6 y se asemeja también a la obtenida en otras 17 , en ambos casos administrado cara a cara y mediante viñetas, y a las encontradas cuando se presentan los estímulos verbales sin viñetas 8 .…”

Section: Discussionunclassified

“…Algún estudio ha utilizado el instrumento prescindiendo de las láminas, sin que hayan aparecido ni diferencias significativas ni ventajas percibidas por el cumplimentador 8 . De este modo, el COOP/WONCA puede utilizarse también como autoinforme al uso, autoadministrado de forma presencial y sin apoyo gráfico, tal y como se ha hecho en amplios estudios poblacionales 9 .…”

Section: Introductionunclassified

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COOP/WONCA: fiabilidad y validez de la prueba administrada telefónicamente

Pérez¹,

Díaz–Olalla²

2016

Atención Primaria

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The Dartmouth COOP Charts: A simple, reliable, valid and responsive quality of life tool for chronic obstructive pulmonary disease

et al. 2005

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The negative impact of chronic obstructive pulmonary disease (COPD) on health-related quality of life (HRQL) is substantial. Measurement of HRQL is increasingly advocated in clinical practice; traditional outcome measures such as lung function are poorly responsive. However many HRQL tools are not user-friendly in the clinic setting. Hence HRQL is often neglected. The Dartmouth Cooperative Functional Assessment Charts (COOP) have the requisite attributes of a tool suitable for routine clinical practice: they are simple, reliable, quick and easy to perform and score and well accepted. We aimed to determine the reliability, validity and responsiveness of the COOP in patients with significant COPD. HRQL was assessed during a prospective, randomised, placebo-controlled, double-blind, 12 week cross-over interventional study of ambulatory oxygen in patients (n = 50) with COPD. Test-retest reliability of the COOP domains was only modest however it was measured over a 2 month period. Significant correlations ranging between 0.4 and 0.8 were observed between all comparable domains of the COOP and the Medical Outcomes Study 36-item Short-form Health Survey, Chronic Respiratory Questionnaire (CRQ) and Hospital Anxiety and Depression (HAD) scale. Following ambulatory oxygen significant improvements were noted in all CRQ and HAD domains. Several domains of the generic SF-36 (role emotional, social functioning, role-physical) showed significant improvements. Comparable domains of the COOP (social activities, feelings) also showed significant improvements. The COOP change in health domain improved very significantly. The COOP is a simple, reliable HRQL tool which proved valid and responsive in our study population of COPD patients and may have a valuable role in routine clinical practice.

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Abstract: COOP charts can be used to assess the health status of a general population. Their validity is good, with the possible exception of the 'social support' chart. The illustrations do not affect the properties of this instrument.

Cited by 11 publications

References 18 publications

Detecting Memory and Structure in Human Navigation Patterns Using Markov Chain Models of Varying Order

Detecting Memory and Structure in Human Navigation Patterns Using Markov Chain Models of Varying Order

COOP/WONCA: fiabilidad y validez de la prueba administrada telefónicamente

The Dartmouth COOP Charts: A simple, reliable, valid and responsive quality of life tool for chronic obstructive pulmonary disease

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