Instrumental variables approach to identification of polynomial wiener systems

2003 ◽  
Author(s):  
Andrzej Janczak
Keyword(s):  
Instrumental Variables ◽  
Wiener Systems ◽  
Instrumental Variables Approach

scholarly journals Postoperative non-steroidal anti-inflammatory drug use and oncological outcomes of rectal cancer

BJS Open ◽  
2021 ◽  
Vol 5 (1) ◽  
Author(s):  
O Grahn ◽  
M Lundin ◽  
M-L Lydrup ◽  
E Angenete ◽  
M Rutegård
Keyword(s):  
Rectal Cancer ◽  
Propensity Score ◽  
Propensity Score Matching ◽  
Instrumental Variables ◽  
Cox Regression ◽  
Recurrence Free Survival ◽  
Free Survival ◽  
Oncological Outcomes ◽  
Anti Inflammatory ◽  
Instrumental Variables Approach

Abstract Background Non-steroidal anti-inflammatory drugs (NSAIDs) are known to suppress the inflammatory response after surgery and are often used for pain control. This study aimed to investigate NSAID use after radical surgical resection for rectal cancer and long-term oncological outcomes. Methods A cohort of patients who underwent anterior resection for rectal cancer between 2007 and 2013 in 15 hospitals in Sweden was investigated retrospectively. Data were obtained from the Swedish Colorectal Cancer Registry and medical records; follow-up was undertaken until July 2019. Patients who received NSAID treatment for at least 2 days after surgery were compared with controls who did not, and the primary outcome was recurrence-free survival. Cox regression modelling with confounder adjustment, propensity score matching, and an instrumental variables approach were used; missing data were handled by multiple imputation. Results The cohort included 1341 patients, 362 (27.0 per cent) of whom received NSAIDs after operation. In analyses using conventional regression and propensity score matching, there was no significant association between postoperative NSAID use and recurrence-free survival (adjusted hazard ratio (HR) 1.02, 0.79 to 1.33). The instrumental variables approach, including individual hospital as the instrumental variable and clinicopathological variables as co-variables, suggested a potential improvement in the NSAID group (HR 0.61, 0.38 to 0.99). Conclusion Conventional modelling did not demonstrate an association between postoperative NSAID use and recurrence-free survival in patients with rectal cancer, although an instrumental variables approach suggested a potential benefit.

scholarly journals The effect of unstable housing on HIV treatment biomarkers: An instrumental variables approach

2018 ◽  
Vol 214 ◽  
pp. 70-82 ◽  
Author(s):  
Omar Galárraga ◽  
Aadia Rana ◽  
Momotazur Rahman ◽  
Mardge Cohen ◽  
Adaora A. Adimora ◽  
...  
Keyword(s):  
Instrumental Variables ◽  
Hiv Treatment ◽  
Unstable Housing ◽  
Instrumental Variables Approach

scholarly journals Child health and schooling achievement in Bangladesh

2014 ◽  
Vol 41 (1) ◽  
pp. 60-74 ◽  
Author(s):  
Rasheda Khanam
Keyword(s):  
Child Health ◽  
Instrumental Variables ◽  
Food Policy ◽  
School Attendance ◽  
School Achievement ◽  
School Enrolment ◽  
Data Set ◽  
Content Type ◽  
The Impact ◽  
Instrumental Variables Approach

Purpose – This paper aims to examine the impact of child health (measured by nutritional status) on schooling performance of Bangladeshi children. Design/methodology/approach – The data set used in this study comes from a survey titled “Micronutrient and Gender Study (MNGS) in Bangladesh”. The survey was administered by the International Food Policy Research Institute (IFPRI). The author controls for the potential endogeneity of child health by an instrumental variables approach. The results indicate that the impact of child health on school achievement will be overestimated if endogeneity of child health is ignored. Findings – The results reveal that child health has significant effects on school enrolment and grade attainment, although it does not affect the current school attendance. The impact of child health is stronger for school enrolment compared to grade attainment. Originality/value – This study improves the understanding on the relationship between child health and schooling in several ways. First, the author controls for the potential endogeneity of child health by an instrumental variables approach. The chosen instrumental variables (i.e. heights of father and mother) are strong predictors of child health and satisfy the validity test. Second, this study examines the effects of child health on wide ranges of schooling measures: enrolment, attendance and attainment.

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