Detection of Influential Observation in Linear Regression

Cook, R. Dennis

doi:10.2307/1268249

Cited by 1,300 publications

(549 citation statements)

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“…The maximum Cook's distance value was related to a F (p, n − p) distribution. Influential values are considered when percentile value is equal or higher than 50 (Cook, 1977;Kutner et al, 2005). All analyses were performed using SPSS version 23 (IBM Corp., Armonk, NY).…”

Section: Statistical Analysesmentioning

confidence: 99%

Concentration Endurance Test (d2): Normative data for Spanish-speaking pediatric population

Rivera

Salinas²,

Ramos-Usuga

et al. 2017

NRE

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Abstract. OBJECTIVE:To generate normative data for the Concentration Endurance Test (d2) in Spanish-speaking pediatric populations. METHOD:The sample consisted of 4,373 healthy children from nine countries in Latin America (Chile, Cuba, Ecuador, Guatemala, Honduras, Mexico, Paraguay, Peru, and Puerto Rico) and Spain. Each participant was administered the d2 test as part of a larger neuropsychological battery. The Total number of items processed (TN), Total number of correct responses (CR), Total performance (TP), and Concentration performance (CP) scores were normed using multiple linear regressions and standard deviations of residual values. Age, age 2 , sex, and mean level of parental education (MLPE) were included as predictors in the analyses. D. Rivera et al. / Concentration Endurance Test (d2) RESULTS:The final multiple linear regression models showed main effects for age on all scores, such that scores increased linearly as a function of age. TN scores were affected by age 2 for Guatemala and Puerto Rico; CR scores were affected by age 2 for Mexico; TP scores were affected by age 2 for Chile, Mexico, Puerto Rico, and Spain; and CP scores for Mexico and Spain. Models indicated that children whose parents had a MLPE >12 years obtained higher scores compared to children whose parents had a MLPE ≤12 years for Mexico and Spain in all scores, and Puerto Rico for TN, CR, and TP, and Guatemala and Paraguay for CP scores. Sex affect the scores for Ecuador and Honduras (CP scores). CONCLUSIONS: This is the largest Spanish-speaking pediatric normative study in the world, and it will allow neuropsychologists from these countries to have a more accurate approach to interpret the d2 test in pediatric populations.

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Section: Statistical Analysesmentioning

confidence: 99%

Concentration Endurance Test (d2): Normative data for Spanish-speaking pediatric population

Rivera

Salinas²,

Ramos-Usuga

et al. 2017

NRE

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“…We first tested for normality in contaminant and isotopic data using Shapiro-Wilk's test [42], and identified outliers as those with Cook's distance more than 3 [43][44][45]. We used general linearized models (GLMs) to examine the effects of year of collection, age class and for a subset of birds, sex and we restricted our model to primary effects and two-way interactions.…”

Section: (C) Statistical Analysismentioning

confidence: 99%

Rapidly increasing methyl mercury in endangered ivory gull ( Pagophila eburnea ) feathers over a 130 year record

2015

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“…To further analyse the impact of species averages taken from few studies with low sample sizes, we did a post-hoc analysis of leverage to check for the importance of single species in determining the regression coefficients. We calculated Cook's distance for all parameters in all analyses 84 . If a Cook's distance was larger than 0.5, we checked the number of studies and the number of individuals on which the estimate was based.…”

Section: Discussionmentioning

confidence: 99%

The wild life of tick-borne pathogens

Hofmeester

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Detection of Influential Observation in Linear Regression

Cited by 1,300 publications

References 0 publications

Concentration Endurance Test (d2): Normative data for Spanish-speaking pediatric population

Concentration Endurance Test (d2): Normative data for Spanish-speaking pediatric population

Rapidly increasing methyl mercury in endangered ivory gull ( Pagophila eburnea ) feathers over a 130 year record

The wild life of tick-borne pathogens

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