Best Sample Size Calculators for iPhone

Posted by Charles Liu

Mar 6, 2018 12:05:25 PM

Photo by Dose Media on Unsplash

By Charles Liu, Senior Product Manager, Cytel

Several years ago, I was one of few Luddites in my social circle still using a “dumb” phone. Other than calls, and (text only!) messaging, it had no other functionality. Once I made the switch, a whole new magical world unveiled itself. With the tap of a button, I could read my email, listen to a podcast, find a...

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Topics: Trial Design Software, EAST 6.4, Sample Size


2017 ASA Biopharmaceutical Section Regulatory-Industry Statistics Workshop

Posted by Cytel

Oct 24, 2017 6:01:00 AM

The ASA Biopharmaceutical Section Regulatory-Industry Statistics Workshop is sponsored by the ASA Biopharmaceutical Section in cooperation with the FDA Statistical Association. Each year 800 statistical practitioners come together to absorb new information on statistical practices in all areas regulated by the FDA.

Cytel was honored to be involved in the workshop program, and our subject...

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Topics: Clinical Data, Clinical Research Services, Adaptive Clinical Trials, adaptive designs, Sample Size, adaptive sample size re-estimation, Bayesian, Regulation, FDA, Promising Zone


3 Strategies to Combat Inferential Conservatism in Small Sample Sizes

Posted by Cytel

Jun 25, 2015 4:28:00 PM

When conducting a clinical trial with small or sparse data sets, statistical methods meant for large sample sizes may fail to obtain an accurate interpretation of data. This is where computationally challenging exact methods often come into play.

Exact methods, however, are inferentially conservative in the sense that due to small sample sizes, the actual Type 1 error rate is often smaller...

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Topics: Sample Size, Exact Inference, exact statistics, Small Sample Sparse Data


Operationally Seamless & Inferentially Seamless Adaptive Designs

Posted by Esha Senchaudhuri

Dec 4, 2014 11:30:00 AM

Fulyzaq® from Napo/Salix was the first drug ever to be approved using an adaptive two-stage "seamless" clinical trial design. However, when Napo Pharmaceuticals sought orphan drug status for Crofelemer (made from the croton lechleri plant, pictured above left), it received a short window from the FDA in which to complete a Phase 3 trial for safety and efficacy. Aiming to diminish both time and...

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Topics: Sample Size, Trial Design, Safety, type 1 error, Dose-Finding


The Perils of Poor Recruitment

Posted by Esha Senchaudhuri

May 5, 2014 10:21:00 PM

A new JAMA study on discontinued randomized trials in Switzerland, Germany and Canada, reports that poor recruitment accounts for 101 out of 253 trials that were eventually discontinued (or about 10% of the 1017 trials which participated in the study). When restricted to industry-sponsored trials with non-healthy volunteers, poor recruitment accounted for the discontinuation of 40 trials out...

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Topics: Nitin Patel, East, East 6.3, Access to Slides PDF, Recruitment, East Recruit, Sample Size, Promising Zone, sample size re-estimation, Adaptive Clinical Trials


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