scholarly journals Probabilistic cause‐of‐disease assignment using case‐control diagnostic tests: A latent variable regression approach

2020 ◽  
Author(s):  
Zhenke Wu ◽  
Irena Chen
Keyword(s):  
Diagnostic Tests ◽  
Latent Variable ◽  
Case Control ◽  
Regression Approach ◽  
Latent Variable Regression

scholarly journals Integrated Multiscale Latent Variable Regression and Application to Distillation Columns

2013 ◽  
Vol 2013 ◽  
pp. 1-17 ◽  
Author(s):  
Muddu Madakyaru ◽  
Mohamed N. Nounou ◽  
Hazem N. Nounou
Keyword(s):  
Feature Extraction ◽  
Latent Variable ◽  
Prediction Accuracy ◽  
Distillation Column ◽  
Selection Criterion ◽  
Process Data ◽  
Distillation Columns ◽  
Latent Variable Regression ◽  
Multiscale Filtering ◽  
Modeling Algorithm

Proper control of distillation columns requires estimating some key variables that are challenging to measure online (such as compositions), which are usually estimated using inferential models. Commonly used inferential models include latent variable regression (LVR) techniques, such as principal component regression (PCR), partial least squares (PLS), and regularized canonical correlation analysis (RCCA). Unfortunately, measured practical data are usually contaminated with errors, which degrade the prediction abilities of inferential models. Therefore, noisy measurements need to be filtered to enhance the prediction accuracy of these models. Multiscale filtering has been shown to be a powerful feature extraction tool. In this work, the advantages of multiscale filtering are utilized to enhance the prediction accuracy of LVR models by developing an integrated multiscale LVR (IMSLVR) modeling algorithm that integrates modeling and feature extraction. The idea behind the IMSLVR modeling algorithm is to filter the process data at different decomposition levels, model the filtered data from each level, and then select the LVR model that optimizes a model selection criterion. The performance of the developed IMSLVR algorithm is illustrated using three examples, one using synthetic data, one using simulated distillation column data, and one using experimental packed bed distillation column data. All examples clearly demonstrate the effectiveness of the IMSLVR algorithm over the conventional methods.

Latent Variable Regression Four-Level Hierarchical Model Using Multisite Multiple-Cohort Longitudinal Data

2019 ◽  
Vol 44 (5) ◽  
pp. 597-624 ◽  
Author(s):  
Kilchan Choi ◽  
Jinok Kim
Keyword(s):  
Longitudinal Data ◽  
Hierarchical Model ◽  
Latent Variable ◽  
Student Growth ◽  
Individual Student ◽  
Assessment Scores ◽  
Student Academic Performance ◽  
Latent Variable Regression ◽  
Fully Bayesian ◽  
Types Of Change

This article proposes a latent variable regression four-level hierarchical model (LVR-HM4) that uses a fully Bayesian approach. Using multisite multiple-cohort longitudinal data, for example, annual assessment scores over grades for students who are nested within cohorts within schools, the LVR-HM4 attempts to simultaneously model two types of change, arising from individual student over grades, and successive cohorts in the same grade over years. In addition, as an extension of Choi and Seltzer, the LVR coefficients, that is, gap-in-time parameter, capturing the relationships between initial status and rates of changes within each cohort and school, help bring to light the distribution of student growth and differences in the distribution over different cohorts within schools. Advantages associated with the LVR-HM4 can be highlighted in studies on monitoring school performance or evaluations of policies and practices that may target different aspects of student academic performance such as initial status, growth, or gap over time in schools.

Interpretation of regression coefficients under a latent variable regression model

2001 ◽  
Vol 15 (4) ◽  
pp. 265-284 ◽  
Author(s):  
Alison J. Burnham ◽  
John F. MacGregor ◽  
Roman Viveros
Keyword(s):  
Regression Model ◽  
Latent Variable ◽  
Regression Coefficients ◽  
Latent Variable Regression
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