Pensim2
Pensim2 is a dynamic microsimulation model to simulate the income of pensioners, owned by the British Department for Work and Pensions. Pensim2 is the second version of Pensim which was developed by Institute for Fiscal Studies in the 1990s. The time horizon of the model is 100 years, by which time today's school leavers will retire. Pensim2 uses a lot of external alignment figures. Overview 

Pensim2 uses aggregate and micro-level data from different data sources, e.g. BHPS, LLMDB and the Family Resources Survey. It simulate a very wide range of economic processes: earnings, housing, savings, pensions, taxes. It has the useful feature of allowing the user to specify certain parameters (for example the rate of return to the stock market). See also
Policy Simulation Model, another model with the same ownership

References

External links
DWP homepage

Department for Work and Pensions
Microsimulation