Statisticians in the Pharmaceutical Industry, abbreviated to PSI, is an organisation for the promotion of statistical thinking in order to improve the quality of research and development in the pharmaceutical industry.

PSI is a non-profit organisation formed in 1977 which was later converted to a company limited by guarantee, a process which was completed in January 2003. PSI achieves its vision by providing a forum for regular discussion of statistics and matters relating to the practice of statistics in the pharmaceutical industry, as well as promoting good statistical practice within the industry.

PSI's membership is around 1000 statisticians from across the Pharmaceutical Industry and academia. About 80% of these are UK based. PSI hosts an annual three day conference for its members, as well as several one-day meetings and training courses. It publishes a quarterly newsletter "SPIN" and sponsors the international journal "Pharmaceutical Statistics", published by John Wiley & Sons.

PSI is a member of the European Federation of Statisticians in the Pharmaceutical Industry (EFSPI).

PSI has held an annual conference every year since 1978. In its early years the conference was typically held at an English university, but later moved to hotel conference facilities. The first conference to be held outside the United Kingdom was in 2008, but since then the venue has tended to alternate between the UK and other European venues outside the UK. The full list of conference locations is shown below:

1. ^ The abbreviation PSI is chosen in preference to the more literal SPI to avoid connotations with the word "spy", and to tie in with the Greek letter Ψ - Greek letters playing a substantial part in statistics. Ψ was the original logo of PSI.
2. ^ The 2020 conference had been scheduled to take place in Barcelona but was changed to a Webinar series because of the Covid-19 pandemic.

• PSI Website
• PharmaClik Website
• Pharmaceutical Statistics (PSI Journal)^{[dead link]}

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