scholarly journals Leveraging random assignment to impute missing covariates in causal studies

2020 ◽  
pp. 1-31
Author(s):  
Gauri Kamat ◽  
Jerome P. Reiter
Keyword(s):  
Missing Covariates ◽  
Random Assignment

The Effect of Partly Missing Covariates on Statistical Power in Randomized Controlled Trials With Discrete-Time Survival Endpoints

Methodology ◽  
2017 ◽  
Vol 13 (2) ◽  
pp. 41-60
Author(s):  
Shahab Jolani ◽  
Maryam Safarkhani
Keyword(s):  
Randomized Controlled Trials ◽  
Discrete Time ◽  
Treatment Effect ◽  
Survival Data ◽  
Controlled Trials ◽  
Missing Covariates ◽  
Indicator Method ◽  
Imputation Methods ◽  
Randomized Controlled ◽  
Baseline Covariates

Abstract. In randomized controlled trials (RCTs), a common strategy to increase power to detect a treatment effect is adjustment for baseline covariates. However, adjustment with partly missing covariates, where complete cases are only used, is inefficient. We consider different alternatives in trials with discrete-time survival data, where subjects are measured in discrete-time intervals while they may experience an event at any point in time. The results of a Monte Carlo simulation study, as well as a case study of randomized trials in smokers with attention deficit hyperactivity disorder (ADHD), indicated that single and multiple imputation methods outperform the other methods and increase precision in estimating the treatment effect. Missing indicator method, which uses a dummy variable in the statistical model to indicate whether the value for that variable is missing and sets the same value to all missing values, is comparable to imputation methods. Nevertheless, the power level to detect the treatment effect based on missing indicator method is marginally lower than the imputation methods, particularly when the missingness depends on the outcome. In conclusion, it appears that imputation of partly missing (baseline) covariates should be preferred in the analysis of discrete-time survival data.

Peningkatan Pengetahuan Calon Pengantin Melalui Konseling ASI Eksklusif di Kecamatan Darul Imarah Aceh Besar

2017 ◽  
Vol 19 (1) ◽  
pp. 36-42
Author(s):  
Agus Hendra Al-Rahmad
Keyword(s):  
Experimental Study ◽  
Exclusive Breastfeeding ◽  
Action Plan ◽  
Scaling Up ◽  
Random Assignment ◽  
Nutrition And Health ◽  
Face To Face ◽  
Child Stunting ◽  
Quasi Experimental ◽  
Breastfeeding Counseling

Background : Scaling Up Nutrition movement is a global effort to strengthen our commitment and accelerating action plan to improve nutrition, particularly the handling of nutrition in the first 1,000 days of life is exclusive breastfeeding and it until 24 months. One of the way is with exclusive breastfeeding counselling that can reduce stunting. The counseling is addressed to brides who need special attention in improving the nutrition and health. Objective : The aim of research to improve knowledge about exclusive breastfeeding counseling the bride through the use of leaflets. Method : This quasi-experimental study was a sample of 30 person a brides with non-random assignment, the variable a knowledge obtained through interviews using questionnaires while the method of counseling does face to face with an exclusive breastfeeding leaflet. The data was analyzed by dependent t-test. Result : The results showed exclusive breastfeeding counseling can improve knowledge bride (p= 0,000) with a mean difference is 6,13 and a deviation is 3,71. Conclusion : Increase of knowledge among ‘bride-to be’ about exclusive breastfeeding could be improved through the use of exclusive breastfeeding leaflet. Each health center must be in collaboration with Office of Religious Affairs to have exclusive breastfeeding counseling, and set one of the priority programs in the prevention of child stunting.   Keywords: Bride, counseling, knowledge of exclusive breastfeeding

PENERAPAN STRATEGI PEMBELAJARAN PROBLEM BASED LEARNING (PBL) DAN STRATEGI PEMBELAJARAN GROUP INVESTIGATION (GI) TERHADAP HASIL BELAJAR MAHASISWA PADA MATERI RESPIRASI TUMBUHAN TADRIS BIOLOGI UIN SUMATERA UTARA

2019 ◽  
Vol 2 (1) ◽  
pp. 167
Author(s):  
Indayana Febriani Tanjung
Keyword(s):  
Problem Based Learning ◽  
Random Assignment ◽  
Quasi Experiment

Penelitian ini bertujuan untuk: 1) mengetahui perbedaan hasil belajar antara mahasiswa yang diajarkan dengan Problem Based Learning dibanding mahasiswa yang diajarkan pembelajaran Group Investigation, 2) mengetahui peningkatan hasil belajar mahasiswa akibat penerapan pembelajaran Problem Based Learning. Jenis penelitian ini quasi experiment. Populasi penelitian adalah sebanyak 132 orang mahasiswa dilakukan secara random assignment. Teknik pengumpulan data menggunakan tes tertulis. Data yang diperoleh dianalisis dengan statistik deskriptif. Hasilnya sebagai berikut. 1) Terdapat perbedaan hasil belajar antara mahasiswa yang diajar Problem Based Learning dengan nilai rata-rata 75,00, nilai tertinggi 90 dan nilai terendah 55, dibandingkan mahasiswa yang diajar pembelajaran Group Investigation dengan nilai rata-rata 59,55, nilai tertinggi 75, dan nilai terendah 40. 2) Ada peningkatan hasil belajar mahasiswa akibat penerapan pembelajaran Problem Based Learning dengan nilai rata-rata peningkatan 46,11 dan ada peningkatan hasil belajar siswa dengan pembelajaran Group Investigation sebesar 29,20.

Research Methods in Clinical Psychology

2010 ◽  
pp. 51-76 ◽  
Author(s):  
Philip C. Kendall ◽  
Jonathan S. Comer
Keyword(s):  
Scientific Community ◽  
Measurement Data ◽  
Design Procedure ◽  
Mechanisms Of Change ◽  
Random Assignment ◽  
Scientific Evaluation ◽  
Scientific Rigor ◽  
Design Considerations ◽  
Key Concepts ◽  
Treatment Manuals

This chapter describes methodological and design considerations central to the scientific evaluation of treatment efficacy and effectiveness. Matters of design, procedure, measurement, data analysis, and reporting are examined and discussed. The authors consider key concepts of controlled comparisons, random assignment, the use of treatment manuals, integrity and adherence checks, sample and setting selection, treatment transportability, handling missing data, assessing clinical significance, identifying mechanisms of change, and consolidated standards for communicating study findings to the scientific community. Examples from the treatment outcome literature are offered, and guidelines are suggested for conducting treatment evaluations that maximize both scientific rigor and clinical relevance.

scholarly journals Random Assignment Problems on 2d Manifolds

2021 ◽  
Vol 183 (2) ◽  
Author(s):  
D. Benedetto ◽  
E. Caglioti ◽  
S. Caracciolo ◽  
M. D’Achille ◽  
G. Sicuro ◽  
...  
Keyword(s):  
Assignment Problem ◽  
Unit Area ◽  
Constant Term ◽  
Beltrami Operator ◽  
Explicit Calculation ◽  
Dimensional Manifold ◽  
Two Dimensional ◽  
Random Assignment ◽  
Assignment Problems ◽  
Theoretical Formulation

AbstractWe consider the assignment problem between two sets of N random points on a smooth, two-dimensional manifold $$\Omega $$ Ω of unit area. It is known that the average cost scales as $$E_{\Omega }(N)\sim {1}/{2\pi }\ln N$$ E Ω ( N ) ∼ 1 / 2 π ln N with a correction that is at most of order $$\sqrt{\ln N\ln \ln N}$$ ln N ln ln N . In this paper, we show that, within the linearization approximation of the field-theoretical formulation of the problem, the first $$\Omega $$ Ω -dependent correction is on the constant term, and can be exactly computed from the spectrum of the Laplace–Beltrami operator on $$\Omega $$ Ω . We perform the explicit calculation of this constant for various families of surfaces, and compare our predictions with extensive numerics.

scholarly journals Debt Relief and Debtor Outcomes: Measuring the Effects of Consumer Bankruptcy Protection

2015 ◽  
Vol 105 (3) ◽  
pp. 1272-1311 ◽  
Author(s):  
Will Dobbie ◽  
Jae Song
Keyword(s):  
United States ◽  
Social Insurance ◽  
The United States ◽  
Debt Relief ◽  
Random Assignment ◽  
Percentage Points ◽  
Consumer Bankruptcy ◽  
Annual Earnings ◽  
The Impact

Consumer bankruptcy is one of the largest social insurance programs in the United States, but little is known about its impact on debtors. We use 500,000 bankruptcy filings matched to administrative tax and foreclosure data to estimate the impact of Chapter 13 bankruptcy protection on subsequent outcomes. Exploiting the random assignment of bankruptcy filings to judges, we find that Chapter 13 protection increases annual earnings by $5,562, decreases five-year mortality by 1.2 percentage points, and decreases five-year foreclo-sure rates by 19.1 percentage points. These results come primarily from the deterioration of outcomes among dismissed filers, not gains by granted filers. (JEL D14, I12, J22, J31, K35)

scholarly journals Rallies around the flag-draped coffins: the electoral effects of security force casualties in terror attacks

2021 ◽  
pp. 1-10
Author(s):  
Resul Umit
Keyword(s):  
Political Violence ◽  
Strong Evidence ◽  
Vote Share ◽  
Security Force ◽  
Random Assignment ◽  
Security Forces ◽  
Terror Attacks ◽  
Electoral Outcomes ◽  
Similar Percentage ◽  
General Elections

Abstract Security forces are one of the main targets of political violence. This paper examines the effect of their casualties on electoral outcomes. Between two general elections in 2015, Turkey experienced a series of attacks that killed 153 members of its security forces. Based on the as-if random assignment of their funerals across the country, I estimate that government vote share increases in the funeral places of security force terror victims. However, in the localities with recurring funerals, it decreases by a similar percentage. These non-linear changes provide strong evidence for the rally theory.

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