Interpreting regression models in clinical outcome studies

Hamilton, David F.; Ghert, Michelle; Simpson, A. H. R. W.

doi:10.1302/2046-3758.49.2000571

Cited by 107 publications

(74 citation statements)

References 8 publications

(8 reference statements)

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“…According to R-squared values we evaluated the goodness of fit which was high for overall effect (0.295) and between rheumatoid arthritis groups (0.323) but low within individual variations (0.043). [24]. alterations observed by CT-scan that could indicate a higher degree of severity of rheumatoid arthritis as well as a longer time with the disease [4,12].…”

Section: Discussionmentioning

confidence: 99%

“…(3) multivariate analysis that controlled for relevant confounders, thus permitting a reduction in bias in the estimated regression coefficient which narrows the detection of negative outcomes including relapse and recurrence; and (4) our goodness of fit was considered to have a high effect size considering the overall R-square value [24,26]. Our approach therefore overcomes many of the limitations of previous studies because we analyzed the RMS mean values every 0.001 seconds over a 30 second period not only the overall RMS mean value.…”

Section: Strengths and Limitations Of The Studymentioning

confidence: 99%

See 1 more Smart Citation

Differences in masseter activity in patients with and without self-reported rheumatoid arthritis using surface electromyography: A cross-sectional study

Cruz-Hervert¹,

Viñas²,

Espinosa³

et al. 2018

Mouth Teeth

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Section: Discussionmentioning

confidence: 99%

Section: Strengths and Limitations Of The Studymentioning

confidence: 99%

Differences in masseter activity in patients with and without self-reported rheumatoid arthritis using surface electromyography: A cross-sectional study

Cruz-Hervert¹,

Viñas²,

Espinosa³

et al. 2018

Mouth Teeth

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“…R 2 is the percentage of the total variation of the dependent variable accounted by the independent variables. An R 2 value close to 1 indicates that the data perfectly fit the model [30]. GCV is an estimate of the parameters in the context of inverse problems and regularization techniques.…”

Section: Gam Selection and The Influencing Variables On Swordfish Dismentioning

confidence: 98%

The Pelagic Habitat of Swordfish (Xiphias gladius) in the Changing Environment of the North Indian Ocean

2019

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Swordfish (Xiphias gladius) are a highly migratory keystone species, found in tropical and temperate seas that are influenced by environmental parameters. In the Bay of Bengal, the Arabian Sea, and the ocean region around Sri Lanka, the environment is gradually changing as a result of climate change. In this study, we identified the preferable environmental conditions for swordfish using satellite-derived environmental data and in-situ fish catch data. We modeled the relationships between fish distribution and the environment changes using Boosted Regression Trees (BRT) and Generalized Additive Model (GAM) methods. The monthly mean fishing effort is comparatively high from October to March and the fish catch rates are high from September to November. Chlorophyll-a concentration has a positive relationship with catch rates while sea surface temperature (SST), sea salt surface mass concentration (SSS), and effort show negative relationships. Approximately 0.3–0.4 mgm−3 of chlorophyll-a, 28–28.5 °C SST, and (3–5)10−8 kgm−3 of SSS were significantly correlated with high swordfish catch rates. According to the optimum environmental conditions identified using the above models, the suitable environmental spatial and temporal distribution was mapped. The results show that the optimum conditions for swordfish are in the eastern region of Sri Lanka, around Thailand and Myanmar, from June to August, and around Bangladesh, Myanmar, Pakistan, the west coast of Sri Lanka, and the east coast of India during September to November.

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“…In order to evaluate the best fitting among the Williamson-Hall models for the current films, the goodness of fit R 2 is used and its values usually varies from 0 to 1. Generally, R 2 value of 1 indicates a perfect fitting, while R 2 value less than 1 shows that at least some variability are unable to be accounted by the fitting [20]. It is noticed that the fitting for samples according to UDEDM possesses high R 2 values compared to other models.…”

Section: Williamson-hall Analysismentioning

confidence: 99%

A Study on Er3+ Substitution in Sol-gel BaTiO3 Thin Films Using X-ray Line Profile Analysis

Ooi

Saif

2017

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Perovskite erbium doped barium titanate (Ba1-xErxTiO3) thin films, at different x values, have been fabricated on SiO2/Si substrate and characterized using X-ray diffraction (XRD) in the range of 20° to 60° to study the phase structure and geometric parameters for the films. XRD patterns show a broadening and shifting for the perovksite peaks toward higher angle due to Er 3+ doping. The effect of Er 3+ substitution into BaTiO3 lattice has been deeply investigated using X-ray line profine analysis through Scherrer equation, Williamson-Hall and size-strain plot (SSP) approaches. For all approaches used, it has been found that the crystallite size for the films decreases as the value of x increases, which is attributed to the relatively small Er 3+ ionic size compared to Ba 2+ . In Williamson-Hall and SSP analysis, it is found that the microstrain created due to Er 3+ doping causes distortion for the lattice and broadening for perovskite peaks as a result. Among all approaches used in this work, SSP shows to be the most suitable for this type of materials by giving the best fitted plots and goodness of fit R 2 close to 1.

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Interpreting regression models in clinical outcome studies

Cited by 107 publications

References 8 publications

Differences in masseter activity in patients with and without self-reported rheumatoid arthritis using surface electromyography: A cross-sectional study

Differences in masseter activity in patients with and without self-reported rheumatoid arthritis using surface electromyography: A cross-sectional study

The Pelagic Habitat of Swordfish (Xiphias gladius) in the Changing Environment of the North Indian Ocean

A Study on Er3+ Substitution in Sol-gel BaTiO3 Thin Films Using X-ray Line Profile Analysis

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