Standard deviation of decelerating object

[kentlad99]

Hi everyone, and thanks for looking or helping in advance!
Hope this is the right subforum.

My math problem is this:

If I have a rotating object decelerating at a non-constant rate due to outside interference, but I have timed data, how do I calculate the standard deviation for the overall rate of deceleration?

I guessed it would be the normal standard deviation of all timed intervals divided by the overall rate of deceleration, but I'm not sure that's correct.

If anyone could advise that'd be brilliant. Thank you.

 

[Deleted member 4993]

Hi everyone, and thanks for looking or helping in advance!
Hope this is the right subforum.

My math problem is this:

If I have a rotating object decelerating at a non-constant rate due to outside interference, but I have timed data, how do I calculate the standard deviation for the overall rate of deceleration?

I guessed it would be the normal standard deviation of all timed intervals divided by the overall rate of deceleration, but I'm not sure that's correct.

If anyone could advise that'd be brilliant. Thank you.

What type of timed data do you have? time vs. rotational speed? time vs. angular location?

 

[kentlad99]

It is rotational speed. I'm making a fixed point and timing the data from that location, but it is slightly erratic due to air resistance etc, so knowing how to calculate the SD from a 'normal' deceleration curve would give me the expected variance which is really what I need for my particular application.