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Adherence, per-protocol effects, and the estimands framework

期刊: PHARMACEUTICAL STATISTICS, 2023; 22 (6)

In the statistical literature, treatment effects in clinical trials are frequently described as either ITT or per-protocol effects. The estimand given......

Parametric and nonparametric methods for confidence intervals and sample size planning for win probability in parallel-group randomized trials with Likert item and Likert scale data

期刊: PHARMACEUTICAL STATISTICS, 2023; 22 (3)

Data on the Likert scale are ubiquitous in medical research, including randomized trials. Statistical analysis of such data may be conducted using the......

Improving early phase oncology clinical trial design: The case for finding the optimal biological dose

期刊: PHARMACEUTICAL STATISTICS, 2023; 22 (4)

Historically early phase oncology drug development programmes have been based on the belief that more is better. Furthermore, rule-based study designs......

Leading beyond regulatory approval: Opportunities for statisticians to optimize evidence generation and impact clinical practice

期刊: PHARMACEUTICAL STATISTICS, 2023; 22 (6)

The role and value of statistical contributions in drug development up to the point of health authority approval are well understood. But health autho......

An evolutionary algorithm for the direct optimization of covariate balance between nonrandomized populations

期刊: PHARMACEUTICAL STATISTICS, 2023; ()

Matching reduces confounding bias in comparing the outcomes of nonrandomized patient populations by removing systematic differences between them. Unde......

Evaluation of a flexible piecewise linear mixed-effects model in the analysis of randomized cross-over trials

期刊: PHARMACEUTICAL STATISTICS, 2023; ()

Cross-over designs are commonly used in randomized clinical trials to estimate efficacy of a new treatment. They have received a lot of attention, par......

Improving early phase oncology clinical trial design: An opportunity for statisticians

期刊: PHARMACEUTICAL STATISTICS, 2023; 22 (3)

This short communication supports that rule-based study designs such as the '3 + 3' study design are still being used in early phase oncology developm......

Type-I-error rate inflation in mixed models for repeated measures caused by ambiguous or incomplete model specifications

期刊: PHARMACEUTICAL STATISTICS, 2023; 22 (6)

Pre-specification of the primary analysis model is a pre-requisite to control the family-wise type-I-error rate (T1E) at the intended level in confirm......

A dynamic power prior approach to non-inferiority trials for normal means

期刊: PHARMACEUTICAL STATISTICS, 2023; ()

Non-inferiority trials compare new experimental therapies to standard ones (active control). In these experiments, historical information on the contr......

Comparison of nonparametric estimators of the expected number of recurrent events

期刊: PHARMACEUTICAL STATISTICS, 2023; ()

We compare the performance of nonparametric estimators for the mean number of recurrent events and provide a systematic overview for different recurre......

Bayesian hierarchical models for adaptive basket trial designs

期刊: PHARMACEUTICAL STATISTICS, 2023; 22 (3)

Basket trials evaluate a single drug targeting a single genetic variant in multiple cancer cohorts. Empirical findings suggest that treatment efficacy......

Propensity score matching and stratification using multiparty data without pooling

期刊: PHARMACEUTICAL STATISTICS, 2023; 22 (1)

Matching and stratification based on confounding factors or propensity scores (PS) are powerful approaches for reducing confounding bias in indirect t......

Performance of phase-I dose finding designs with and without a run-in intra-patient dose escalation stage

期刊: PHARMACEUTICAL STATISTICS, 2023; 22 (2)

Dose-finding designs for phase-I trials aim to determine the recommended phase-II dose (RP2D) for further phase-II drug development. If the trial incl......

Replenishing the pipeline: A quantitative approach to optimising the sourcing of new projects

期刊: PHARMACEUTICAL STATISTICS, 2023; 22 (5)

Large pharmaceutical companies maintain a portfolio of assets, some of which are projects under development while others are on the market and generat......

Bayesian borrowing from historical control data in a vaccine efficacy trial

期刊: PHARMACEUTICAL STATISTICS, 2023; 22 (5)

In the context of vaccine efficacy trial where the incidence rate is very low and a very large sample size is usually expected, incorporating historic......

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