Replicating Cahart (1997) equally weighted portfolios with re-form

[Theodosis Kallenos]

Hello I am trying to replicate Cahart (1997) . This is how it is stated in the text:
"In this section, I form portfolios of mutual funds on lagged one-year returns and estimate performance on the resulting portfolios.
On January 1 of each year, I form ten equal-weighted portfolios of mutual funds, using reported returns.
I hold the portfolios for one year, then re-form them. This yields a time series of monthly returns on each decile portfolio from 1963 to 1993. Funds that disappear during the course of the year are included in the equal-weighted average until they disappear, then the portfolio weights are readjusted appropriately."

Any idea on how to do that?

Article: "On Persistence in Mutual Fund Performance".

[Phil Bromiley]

You'll increase your chances of a useful answer if you follow the FAQ on asking questions - provide Stata code in code delimiters, Stata output, and sample data.

There has been discussion of such portfolios on this list serve. You might check them out. While this is doable, I think it will take a substantial amount of programming.