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The final version of the shortened PMH instrument was tested for construct validity, DIF, reliability and criterion validity using data from the second stage.
We aimed to (1) explore the potential threats to external validity using data from the first 20 000 patients screened in AVERT and (2) examine the person, place, and setting and practice related reasons for non-recruitment to the trial.
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This research reports on 2 longitudinal assessments of the scale's predictive validity using data collected at 4 stages from a consumer mail-survey sample.
With respect to the analysis of convergent validity, performed using data from the community-based sample, responses to the global oral health question were skewed strongly towards the "very good" response (very poor 0.3%; poor 0%; fair 2.1%; good 23.4%; very good 74.2%).
Internal consistency, longitudinal and cross-sectional validity were evaluated using data from all patients.
Convergent and discriminant validity was evaluated using data from the whole set of patients with the exception of the POMS-SF questionnaire.
The instrument was assessed for data quality, reliability, validity, and responsiveness using data from a randomised trial and patient survey about general practitioners' use of Magnetic Resonance Imaging for patients with a suspected ligamentous or meniscal injury.
Convergent validity was investigated, using data from SIV-1, by evaluating whether causal domains (Feelings about injections, Self-confidence, Injection-site rEaseiofs, Ease of use, and Self-image) were more strongly correlated with the Satisfaction with self-injection domain than with each other, as hypothesized by the refined conceptual model.
Therefore, known-groups validity analyses were performed using data from Week 24.
Construct validity was also evaluated using data from Week 24 in a known-groups framework.
To ensure that legislation on privacy does not unduly threaten the validity of observational studies using data from medical records, education of bodies responsible for overseeing research and further investigations are urgently needed on the determinants and consequences of consent and non-consent for these studies.
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CEO of Professional Science Editing for Scientists @ prosciediting.com