Burndown velocity

[Fernando H. Moralles]

I would like to know how the velocity is calculated on burndown chat.

[Alexey S. Mirniy]

Very simple:
First it takes start iteration date and sum of all estimated hours and put point at top left corner.
Next it put point at the end iteration date according with assumption that all task should be done and 0 hours left to do.
Than it connect this two point with straight line.

If you add issues during iteration velocity will be recalculated.

Iteration start date calculation is based on issues start date.
(Or if Iteration model has attribute start_date)

[Fernando H. Moralles]

Thank's for the answer.

I just can't understand where i mistake. Take a look in the picture.

No issues has start_date and due_date seted. This dates are based on version. But version doesn't has start_date. Only due_date. How the start_date is calculated?

[Alexey S. Mirniy]

Really strange.
But it could be if You move some task out from iteration or decrease estimation time for some task on December 6th.

[Fernando H. Moralles]

Thanks.. I will set the start date and due date of issues next time and control to nobody take off issue from correct sprint and see how the velocity line works.

Thanks again.