A TWO STAGE MODELING APPROACH FOR CHRONIC MIGRAINE DATA

2020 ◽  
Vol 17 (2) ◽  
pp. 337-357
Author(s):  
Marta Galvani ◽  
Chiara Bardelli ◽  
Sara Bottiroli ◽  
Silvia Figini
Keyword(s):  
Chronic Migraine ◽  
Two Stage ◽  
Modeling Approach ◽  
Stage Modeling

scholarly journals An empirical example of analysis using a two-stage modeling approach: within-subject association of outdoor context and physical activity predicts future daily physical activity levels

2020 ◽  
Author(s):  
Chih-Hsiang Yang ◽  
Jaclyn P Maher ◽  
Aditya Ponnada ◽  
Eldin Dzubur ◽  
Rachel Nordgren ◽  
...  
Keyword(s):  
Physical Activity ◽  
Vigorous Physical Activity ◽  
Wearable Sensors ◽  
Activity Levels ◽  
Two Stage ◽  
Modeling Approach ◽  
Source Program ◽  
Modeling Strategy ◽  
Stage Modeling

Abstract People differ from each other to the extent to which momentary factors, such as context, mood, and cognitions, influence momentary health behaviors. However, statistical models to date are limited in their ability to test whether the association between two momentary variables (i.e., subject-level slopes) predicts a subject-level outcome. This study demonstrates a novel two-stage statistical modeling strategy that is capable of testing whether subject-level slopes between two momentary variables predict subject-level outcomes. An empirical case study application is presented to examine whether there are differences in momentary moderate-to-vigorous physical activity (MVPA) levels between the outdoor and indoor context in adults and whether these momentary differences predict mean daily MVPA levels 6 months later. One hundred and eight adults from a multiwave longitudinal study provided 4 days of ecological momentary assessment (during baseline) and accelerometry data (both at baseline and 6 month follow-up). Multilevel data were analyzed using an open-source program (MixWILD) to test whether momentary strength between outdoor context and MVPA during baseline was associated with average daily MVPA levels measured 6 months later. During baseline, momentary MVPA levels were higher in outdoor contexts as compared to indoor contexts (b = 0.07, p < .001). Participants who had more momentary MVPA when outdoors (vs. indoors) during baseline (i.e., a greater subject-level slope) had higher daily MVPA at the 6 month follow-up (b = 0.09, p < .05). This empirical example shows that the subject-level momentary association between specific context (i.e., outdoors) and health behavior (i.e., physical activity) may contribute to overall engagement in that behavior in the future. The demonstrated two-stage modeling approach has extensive applications in behavioral medicine to analyze intensive longitudinal data collected from wearable sensors and mobile devices.

Simulating the economic viability of crawfish production: A two‐stage modeling approach

2001 ◽  
Vol 5 (1-2) ◽  
pp. 69-79 ◽  
Author(s):  
Amy McCullough ◽  
Conrado M. Gempesaw ◽  
William H. Daniels ◽  
J. Richard Bacon
Keyword(s):  
Economic Viability ◽  
Two Stage ◽  
Modeling Approach ◽  
Stage Modeling

Investigation and two-stage modeling of sintering behavior of nano/micro-bimodal powders

2019 ◽  
Vol 352 ◽  
pp. 42-52 ◽  
Author(s):  
Joo Won Oh ◽  
Yujin Seong ◽  
Da Seul Shin ◽  
Seong Jin Park
Keyword(s):  
Sintering Behavior ◽  
Two Stage ◽  
Stage Modeling
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