Bryan Keller
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View article: Symptom networks of common mental disorders in public versus private healthcare settings in India
Symptom networks of common mental disorders in public versus private healthcare settings in India Open
We present a series of network analyses aiming to uncover the symptom constellations of depression, anxiety and somatization among 2,796 adult primary health care attendees in Goa, India, a low- and middle-income country (LMIC). Depression…
View article: A new four-arm within-study comparison: Design, implementation, and data
A new four-arm within-study comparison: Design, implementation, and data Open
Within-study comparisons (WSCs) use real, rather than simulated, data to compare estimates from observational studies against benchmarks from randomized controlled trials (RCTs). A primary goal of WSCs is to assess whether well-designed qu…
View article: Enhancing Cough Motor Learning in Parkinson's Disease Through Variable Practice During Skill Training
Enhancing Cough Motor Learning in Parkinson's Disease Through Variable Practice During Skill Training Open
Background When re‐learning a motor skill, practicing a variety of treatment targets promotes error processing and the exploration of motor control strategies, which initially disrupts accuracy during training (motor performance), but ulti…
View article: A new four-arm within-study comparison: Design, implementation, and data
A new four-arm within-study comparison: Design, implementation, and data Open
Within-study comparisons (WSCs) use real, rather than simulated, data to compare estimates from observational studies against a benchmark randomized controlled trial (RCT). A primary goal of WSCs is to assess whether well-designed quasi-ex…
View article: A new four-arm within-study comparison: Design, implementation, and data
A new four-arm within-study comparison: Design, implementation, and data Open
Within-study comparisons (WSCs) use real, rather than simulated, data to compare estimates from observational studies against a benchmark randomized controlled trial (RCT). A primary goal of WSCs is to assess whether well-designed quasi-ex…
View article: Defining, Identifying, and Estimating Causal Effects with the Potential Outcomes Framework: A Review for Education Research
Defining, Identifying, and Estimating Causal Effects with the Potential Outcomes Framework: A Review for Education Research Open
Causal inference involves determining whether a treatment (e.g., an education program) causes a change in outcomes (e.g., academic achievement). It is well-known that causal effects are more challenging to estimate than associational effec…
View article: Speech Treatment Effects on Narrative Intelligibility in French-Speaking Children With Dysarthria
Speech Treatment Effects on Narrative Intelligibility in French-Speaking Children With Dysarthria Open
Purpose This study examined the effects of Speech Intelligibility Treatment (SIT) on intelligibility and naturalness of narrative speech produced by francophone children with dysarthria due to cerebral palsy. Method Ten francophone childre…
View article: Heterogeneous Subgroup Identification with Observational Data: A Case Study Based on the National Study of Learning Mindsets
Heterogeneous Subgroup Identification with Observational Data: A Case Study Based on the National Study of Learning Mindsets Open
In this paper, we use a two-step approach for heterogeneous subgroup identification with a synthetic data set motivated by the National Study of Learning Mindsets.In the first step, optimal full propensity score matching is used to estimat…
View article: Note-taking and science inquiry in an open-ended learning environment
Note-taking and science inquiry in an open-ended learning environment Open
Note-taking is important for academic success and has been thoroughly studied in traditional classroom contexts. Recent advancements of technology have led to more students taking notes on computers, and in different situations than are co…
View article: Probability of Vitamin D Deficiency by Body Weight and Race/Ethnicity
Probability of Vitamin D Deficiency by Body Weight and Race/Ethnicity Open
The effects of skin color and body weight on vitamin D status are large both statistically and clinically. Knowledge of these effects may facilitate diagnosis of vitamin D deficiency.
View article: Weight and skin colour as predictors of vitamin D status: results of an epidemiological investigation using nationally representative data
Weight and skin colour as predictors of vitamin D status: results of an epidemiological investigation using nationally representative data Open
Objective Current US dietary recommendations for vitamin D vary by age. Recent research suggests that body weight and skin colour are also major determinants of vitamin D status. The objective of the present epidemiological investigation w…