Ask Colin

In calculating MACD, which days can you start making the calculation of each line?

From day 12, you can start calculating the 12 period EMA.

From day 26 you can start calculating the 26 period EMA.

From day 26, you can also begin calculating the fast MACD line.

From day 34, you can begin calculating the slow Signal line.

I would then be inclined to allow a further period before using the two lines, because an EMA starts with a simple average and it takes a little while for the exponential effect to settle down.