Given the modern day computing capabilities, calculating is easy . Here X and Y stand for dependent and independent variable data, the resultant computation gives the estimates of a linear model . Below is Brunsviga Arithmometer, a tool for adding , subtracting, multiply and dividing. Yule, the famous statistician is known to have used 2 slide rules and this machine below to calculate betas. Now, how does one one calculate inverse of a matrix using slide rule and arithmometer ?

The best way is always to stop when you are going good and when you know what will happen next. If you do that every day … you will never be stuck. Always stop while you are going good and don’t think about it or worry about it until you start to write the next day. That way your subconscious will work on it all the time. But if you think about it consciously or worry about it you will kill it and your brain will be tired before you start.

I believe that there are patterns in markets that can be studied to take arb positions. Some trades go wrong , Some trades go right. Overall as long as you are right in majority of the trades, you are safely home. It was easy for me to accept this framework when a LOT of my trades went wrong. I was enthused about fixing the parameters of the strategy, getting a better time window, using a ton of diagnostic tests etc.

_ " Email is a wonderful thing for people whose role in life is to be on top of things. But not for me; my role is to be on the bottom of things. What I do takes long hours of studying and uninterruptible concentration. I try to learn certain areas of computer science exhaustively; then I try to digest that knowledge into a form that is accessible to people who don’t have time for such study.

If you wait until you see clearly, you will never act. If you wait for a pure motive, you will never move. - Dickson G Watts