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Adaptive weighting for flexible estimation in nonparametric regression models.
Nosedal-Sanchez, Alvaro - 2011
We propose a new method to find spatially adaptive smoothing splines. This new method breaks down the interval [0, 1] into p disjoint sub-intervals. Then we define p functional components in [0, 1], which have two importantfeatures. First, the purpose of each of these p components is to estimate...
Persistent link: https://www.econbiz.de/10009429662
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Demographic and economic trends in medical schemes--a time series analysis [Demografiese en ekonomiese tendense vir mediese skemas--'n tydreeksanalise.]
Hartshorne J.E.; Carstens I.L. - 1991
A time series analysis was performed on medical scheme statistics with the aim of determining current and future demographic and economic trends. This would enable one to reach a better perspective on the current and future financial dilemma presently experienced by medical schemes. Data for the...
Persistent link: https://www.econbiz.de/10009480497
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Evaluation of statistical estimation methods for lognormally distributed variables.
Parkin, T.B.; Meisinger, J.J.; Chester, S.T.; Starr, J.L.; … - 1988
lognormal population. The four statistical methods were: (i) the geometric mean (GM), (ii) a bias-corrected form of the …
Persistent link: https://www.econbiz.de/10009429560
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Robustness in Latent Variable Models
Huang, Xianzheng - 2006
Statistical models involving latent variables are widely used in many areas of applications, such as biomedical science and social science. When likelihood-based parametric inferential methods are used to make statistical inference, certain distributional assumptions on the latent variables are...
Persistent link: https://www.econbiz.de/10009431306
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Causal Inference with Two-Stage Logistic Regression - Accuracy, Precision, and Application
Cai, Bing - 2010
2SPS and 2SRI for logistic binary outcomes have not been thoroughly studied. We study the bias and variance properties … trial. We first present closed form expressions of asymptotic bias for the causal odds ratio from both 2SPS and 2SRI … approaches. Our closed form bias results show that the 2SPS logistic regression generates asymptotically biased estimates of this …
Persistent link: https://www.econbiz.de/10009439053
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Adaptive Inference for Multi-Stage Survey Data
Al-Zou'bi, L. M.; Clark, Robert Graham; Steel, D. G. - 2009
Two-stage sampling usually leads to higher variances for estimators of means and regression coefficients, because of intra-cluster homogeneity. One way of allowing for clustering in fitting a linear regression model is to use a linear mixed model with two levels. If the estimated intra-cluster...
Persistent link: https://www.econbiz.de/10009457371
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Evaluating bias caused by screening in observational risk-factor studies of lung cancer nested in the PLCO randomized screening trial.
Jansen, Ricky Jeffrey - 2009
It is well-known that bias such as lead-time and length distort studies of screening efficacy whether survival or … incidence is of interest. A third bias, usually called overdiagnosis bias, occurs when an individual is only diagnosed with … disease before death from a different cause because he/she is screened. These forms of bias can also arise in observational …
Persistent link: https://www.econbiz.de/10009462767
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Bias Reduction and Goodness-of-Fit Tests in Conditional Logistic Regression Models
Sinha, Samiran (contributor); Wang, Suojin (contributor) - 2010
bias preventive approach developed by Firth (1993) to handlethe bias of an estimator of the log-odds ratio parameter in … conditional logistic regression bysolving a modified score equation. The resultant estimator not only reduces bias but alsocan …
Persistent link: https://www.econbiz.de/10009464883
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Explosive Behavior In The 1990S Nasdaq: When Did Exuberance Escalate Asset Values?
Phillips, PCB; Wu, YR; Yu, J - 2011
A recursive test procedure is suggested that provides a mechanism for testing explosive behavior, date stamping the origination and collapse of economic exuberance, and providing valid confidence intervals for explosive growth rates. The method involves the recursive implementation of a...
Persistent link: https://www.econbiz.de/10009483168
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Better Safe than Sorry: Precautionary Reasoning and Implied Dominance in Risky Decisions
DeKay, Michael L.; Patiño-Echeverri, Dalia; Fischbeck, … - 2005
alternatives can seriously bias the evaluation of consequences in risky high-stakes decisions. …
Persistent link: https://www.econbiz.de/10009441242