Analysis of ordered probit model with surrogate response data and measurement error in covariates

ABSTRACT

Often in data arising out of epidemiologic studies, covariates are subject to measurement error. In addition ordinal responses may be misclassified into a category that does not reflect the true state of the respondents. The goal of the present work is to develop an ordered probit model that corrects for the classification errors in ordinal responses and/or measurement error in covariates. Maximum likelihood method of estimation is used. Simulation study reveals the effect of ignoring measurement error and/or classification errors on the estimates of the regression coefficients. The methodology developed is illustrated through a numerical example.     

The robustness of the likelihood ratio test,the nonparametric sum rank test,and f-ratio tests when the populations are from the negative binomial family

In this study, the robustness of power and significance level of several statistical testing methods was evaluated under the assumption that the test populations were from Poisson, negative binomial, or geometric distributions. The F-ratio test, with or without appropriate transformations, was shown to be both safe and robust for all distributions examined.     

Aquatic landscape change,extirpations, and introductions in the Chicago Region

Urban Ecosystems - Prior to European settlement, swamps, marshes, lakes, and streams were the major landscape features of the Chicago region. Much of this has been altered or lost in the past...     

Exploring Similarity and Stability of Differentiation in Relationships: A Dyadic Study of Bowen's Theory

Bowen family systems theory (BFST) identifies differentiation of self as a crucial characteristic that relates to one's individual and relational maturity. Bowen theorizes that an individual's level of differentiation typically remains static over time and that individuals select and pair in relationships with others who have similar levels of differentiation. This study aimed to test the hypotheses of BFST by using components of differentiation of self, emotional reactivity, and emotional cutoff, in dyadic structural equation modeling. Specifically, a longitudinal dyadic confirmatory factor analysis and structural equation longitudinal panel model were two analyses utilized to statistically test the dyadic nonindependence and stability of emotional reactivity and emotional cutoff across time. Results indicated mixed support for Bowen's assumptions regarding similarity (nonindependence) and stability. That is, small levels of nonindependence and significant stability paths across time were found. Theoretical implications and considerations for future research are discussed.     

A Network Therapy Clinic for Clients with Intellectual Disability

Over the past 30 years a systemic approach has been applied to complex cases involving intellectual disability and behaviours of concern. This paper describes a model that draws on systemic family therapy and network therapy as well as the use of a reflective team. A single session intervention was provided for families of people with intellectual disability. A systemic consultation was used as a pre‐session meeting for professionals working with the family. The systemic consultation and single session therapy allowed the family and the professional network to gain insight. Involving the professionals in the therapy session also enhanced the alliance between professionals and family. This approach assists everyone involved in the case to find a way to progress.     

Step by step: tenant accounts of securing and maintaining quality housing with a housing choice voucher

Previous research on renters’ experiences in the Housing Choice Voucher (HCV) program is robust, but much of it has been conducted in the context of mobility interventions providing added resources. In contrast, this study focuses on HCV renters’ experiences searching for housing without the support of a mobility intervention. In semistructured interviews, 34 HCV renters describe their housing search processes and outcomes. We find that renters struggle to secure housing in their preferred neighborhoods due to limited information and financial costs such as application fees and security deposits. Discussion focuses on practice and policy reforms that might support greater housing choice.