I started programmer role when I joined Roche. My work was mainly on PHC (Personalized Healthcare). I worked closely with biomarker scientists, senior experimental statistician to perform biomarker analyses and intepret the results. I also collaborated with a member from Statistics Methods & Research Group on safety work. I have applied methods such as Propensity Scores, IPTW (Inverse Probability of Treatment Weighting), SSM (Sample Selection Models), IVA (Instrumental Variable Analysis) and CART (Classification and Regression Tree) to safety data analyses.