The SIG is led by Professor Amanda Mocroft and Dr Alessandro Cozzi-Lepri of the HIV Epidemiology and Biostatistics Group of University College London, London UK .The SIG includes senior and junior statitsticians as well as PhD students in PERSIMUNE affiliated to PER-SIMUNE University partners, in addition to those with an interest in methodology, statistical analysis or interpretation of data. The main aim/task of the SIG is to collaborate with clinical and scientific staff in PERSIMUNE in the design, implementation, analysis and reporting of medical research.