There are some murmurings that I am emerging as some sort of back-test guru but that cannot be further from the truth. I am still very much of a noob and have a whole lot more to learn.

Today I will take about some aspects of backtesting that I will need to straighten out to improve some of my own investing strategies.

a) Understanding superior returns

The book explains that there are just two sources of superior returns. First, acceptance of liquidity risk. And second, superior information. Back-testing may refers to obtaining of superior information that compares strategies against each other although some of the counters flagged by a stock screener can lack liquidity. ( Like my frustration of being unable to buy more Global Testing stocks )

b) The problem of trading costs

Bloomberg’s backtesting tool should allow us to factor in trading costs. In such a case, monthly …