Browsing by Subject "Bias"

Now showing items 1-7 of 7

    • Article  

      Density ratio model selection 

      Fokianos, Konstantinos (2007)
      The density ratio model presumes that the log-likelihood ratio of two unknown densities is of some known parametric linear form. However, the choice of the functional form has an impact on both estimation and testing. The ...
    • Article  

      Developing the evidence base for cancer chemoprevention: Use of meta-analysis 

      Nikolopoulos, Georgios K.; Bagos, Pantelis G.; Bonovas, Stefanos (2011)
      Meta-analysis is a quantitative approach for systematically combining the results of previous studies in order to arrive at conclusions about the body of research. It answers a specific research question, includes an ...
    • Article  

      On the effect of misspecifying the density ratio model 

      Fokianos, Konstantinos; Kaimi, I. (2006)
      The density ratio model specifies that the log-likelihood ratio of two unknown densities is of known linear form which depends on some finite dimensional parameters. The model can be broadened to allow for m-samples in a ...
    • Article  

      On the use of high frequency measures of volatility in MIDAS regressions 

      Andreou, Elena (2016)
      Many empirical studies link mixed data frequency variables such as low frequency macroeconomic or financial variables with high frequency financial indicators’ volatilities, especially within a predictive regression model ...
    • Article  

      Randomised trials comparing chemotherapy regimens for advanced non-small cell lung cancer: Biases and evolution over time 

      Ioannidis, J. P. A.; Polycarpou, A.; Ntais, C.; Pavlidis, Nicholas (2003)
      We systematically evaluated the evidence from randomised trials comparing various chemotherapy regimens for advanced non-small cell lung cancer. Across 254 eligible trials (42 661 patients), no regimens were compared in ...
    • Article  

      Randomized evidence on chemotherapy and hormonal therapy regimens for advanced endometrial cancer: An overview of survival data 

      Polyzos, N. P.; Pavlidis, Nicholas; Paraskevaidis, E.; Ioannidis, J. P. A. (2006)
      Several chemotherapy and hormonal therapy regimens have been used in advanced endometrial cancer. In this review we have systematically evaluated the available data from randomized trials on survival. We searched MEDLINE, ...
    • Article  

      Tapered block bootstrap 

      Paparoditis Efstathios, E.; Politis, Dimitris Nicolas (2001)
      We introduce and study tapered block bootstrap methodology that yields an improvement over the well-known block bootstrap for time series of Künsch (1989). The asymptotic validity and the favourable bias properties of the ...