Yasutaka Chiba

Summary

Affiliation: Kinki University
Country: Japan

Publications

  1. doi request reprint Bias analysis of the instrumental variable estimator as an estimator of the average causal effect
    Yasutaka Chiba
    Department of Environmental Medicine and Behavioral Science, Kinki University School of Medicine, 377 2 Ohno Higashi, Osakasayama, Osaka 589 8511, Japan
    Contemp Clin Trials 31:12-7. 2010
  2. doi request reprint Bounds on causal effects in randomized trials with noncompliance under monotonicity assumptions about covariates
    Yasutaka Chiba
    Department of Environmental Medicine and Behavioral Science, Kinki University School of Medicine, 377 2, Ohno Higashi, Osakasayama, Osaka 589 8511, Japan
    Stat Med 28:3249-59. 2009
  3. doi request reprint Kaplan-Meier curves for survivor causal effects with time-to-event outcomes
    Yasutaka Chiba
    Division of Biostatistics, Clinical Research Center, Kinki University School of Medicine, Osaka, Japan
    Clin Trials 10:515-21. 2013
  4. doi request reprint Marginal structural models for estimating principal stratum direct effects under the monotonicity assumption
    Yasutaka Chiba
    Division of Biostatistics, Clinical Research Center, Kinki University School of Medicine 377 2, Ohno Higashi, Osakasayama, Osaka 589 8511, Japan
    Biom J 53:1025-34. 2011
  5. pmc A simple method for principal strata effects when the outcome has been truncated due to death
    Yasutaka Chiba
    Department of Environmental Medicine and Behavioral Science, Kinki University School of Medicine, 377 2 Ohno Higashi, Osakasayama, Osaka, Japan
    Am J Epidemiol 173:745-51. 2011
  6. doi request reprint Bounds on controlled direct effects under monotonic assumptions about mediators and confounders
    Yasutaka Chiba
    Department of Environmental Medicine and Behavioral Science, Kinki University School of Medicine, Osakasayama, Osaka, Japan
    Biom J 52:628-37. 2010
  7. doi request reprint The sign of the unmeasured confounding bias under various standard populations
    Yasutaka Chiba
    Department of Environmental Medicine and Behavioral Science, Kinki University School of Medicine, Osakasayama, Osaka 589 8511, Japan
    Biom J 51:670-6. 2009
  8. doi request reprint Marginal structural models for estimating effect modification
    Yasutaka Chiba
    Department of Environmental Medicine and Behavioral Science, Kinki University School of Medicine, Osakasayama, Osaka, Japan
    Ann Epidemiol 19:298-303. 2009
  9. doi request reprint A scoring algorithm for predicting the presence of adult asthma: a prospective derivation study
    Katsuyuki Tomita
    Department of Respiratory Medicine and Allergology, Kinki University Faculty of Medicine, Osaka Sayama, Osaka, Japan
    Prim Care Respir J 22:51-8. 2013
  10. doi request reprint Phase II study of single intraperitoneal chemotherapy followed by systemic chemotherapy for gastric cancer with peritoneal metastasis
    Motohiro Imano
    Surgery, Kinki University Faculty of Medicine, 377 2 Ohno Higashi, Osaka Sayama, Osaka, 589 8511, Japan
    J Gastrointest Surg 16:2190-6. 2012

Detail Information

Publications12

  1. doi request reprint Bias analysis of the instrumental variable estimator as an estimator of the average causal effect
    Yasutaka Chiba
    Department of Environmental Medicine and Behavioral Science, Kinki University School of Medicine, 377 2 Ohno Higashi, Osakasayama, Osaka 589 8511, Japan
    Contemp Clin Trials 31:12-7. 2010
    ..The proposed method will help investigators to provide a realistic picture of the potential bias of the IV estimate. It is illustrated using a field trial for coronary heart disease...
  2. doi request reprint Bounds on causal effects in randomized trials with noncompliance under monotonicity assumptions about covariates
    Yasutaka Chiba
    Department of Environmental Medicine and Behavioral Science, Kinki University School of Medicine, 377 2, Ohno Higashi, Osakasayama, Osaka 589 8511, Japan
    Stat Med 28:3249-59. 2009
    ..The results are extended to cases of noncompliance by subjects not receiving any treatment. Although the monotonicity assumptions are not themselves identifiable, they are nonetheless reasonable in some situations...
  3. doi request reprint Kaplan-Meier curves for survivor causal effects with time-to-event outcomes
    Yasutaka Chiba
    Division of Biostatistics, Clinical Research Center, Kinki University School of Medicine, Osaka, Japan
    Clin Trials 10:515-21. 2013
    ..Although several methods have been presented to estimate the SCE with time-to-event outcomes, they are difficult to implement in practice...
  4. doi request reprint Marginal structural models for estimating principal stratum direct effects under the monotonicity assumption
    Yasutaka Chiba
    Division of Biostatistics, Clinical Research Center, Kinki University School of Medicine 377 2, Ohno Higashi, Osakasayama, Osaka 589 8511, Japan
    Biom J 53:1025-34. 2011
    ..We propose MSMs for estimating PSDEs. We demonstrate that the PSDE can be estimated readily using MSMs under the monotonicity assumption...
  5. pmc A simple method for principal strata effects when the outcome has been truncated due to death
    Yasutaka Chiba
    Department of Environmental Medicine and Behavioral Science, Kinki University School of Medicine, 377 2 Ohno Higashi, Osakasayama, Osaka, Japan
    Am J Epidemiol 173:745-51. 2011
    ....
  6. doi request reprint Bounds on controlled direct effects under monotonic assumptions about mediators and confounders
    Yasutaka Chiba
    Department of Environmental Medicine and Behavioral Science, Kinki University School of Medicine, Osakasayama, Osaka, Japan
    Biom J 52:628-37. 2010
    ..While previous studies assumed that an outcome is a binary variable, we do not make that assumption. The proposed bounds are illustrated using two examples from randomized trials...
  7. doi request reprint The sign of the unmeasured confounding bias under various standard populations
    Yasutaka Chiba
    Department of Environmental Medicine and Behavioral Science, Kinki University School of Medicine, Osakasayama, Osaka 589 8511, Japan
    Biom J 51:670-6. 2009
    ..Here, we extend his results to these causal effects, and apply our theorems to an observational study. When researchers have a sense of what the unmeasured confounder may be, conclusions can be drawn about the sign of the bias...
  8. doi request reprint Marginal structural models for estimating effect modification
    Yasutaka Chiba
    Department of Environmental Medicine and Behavioral Science, Kinki University School of Medicine, Osakasayama, Osaka, Japan
    Ann Epidemiol 19:298-303. 2009
    ..Here, we propose MSMs for estimating effect modification in observational cohort and case-control studies...
  9. doi request reprint A scoring algorithm for predicting the presence of adult asthma: a prospective derivation study
    Katsuyuki Tomita
    Department of Respiratory Medicine and Allergology, Kinki University Faculty of Medicine, Osaka Sayama, Osaka, Japan
    Prim Care Respir J 22:51-8. 2013
    ..To predict the presence of asthma in adult patients with respiratory symptoms, we developed a scoring algorithm using clinical parameters...
  10. doi request reprint Phase II study of single intraperitoneal chemotherapy followed by systemic chemotherapy for gastric cancer with peritoneal metastasis
    Motohiro Imano
    Surgery, Kinki University Faculty of Medicine, 377 2 Ohno Higashi, Osaka Sayama, Osaka, 589 8511, Japan
    J Gastrointest Surg 16:2190-6. 2012
    ....
  11. doi request reprint A Phase I study of chemoradiotherapy with use of involved-field conformal radiotherapy and accelerated hyperfractionation for Stage III non-small cell lung cancer: WJTOG 3305
    Takuhito Tada
    Department of Radiology, Osaka City University Graduate School of Medicine, Osaka, Japan
    Int J Radiat Oncol Biol Phys 83:327-31. 2012
    ..A Phase I study to determine a recommended dose of thoracic radiotherapy using accelerated hyperfractionation for unresectable non-small-cell lung cancer was conducted...
  12. ncbi request reprint Mesothelioma risk and environmental exposure to asbestos: past and future trends in Japan
    Kenichi Azuma
    Department of Environmental Medicine and Behavioural Science, Kinki University School of Medicine, Osaka, Japan
    Int J Occup Environ Health 15:166-72. 2009
    ..Our estimation of risk approximately corresponded to observed risks. Past and predicted future disease suggest the need for social and medical support in these areas...