AnsweredAssumed Answered

vrf Mean Square Error (MSE)

Question asked by VRFuser on Jul 1, 2008
Alex Wirianski <awir7858@mail.usyd.edu.au> wrote:
> Hi all
> Has anyone had any experience with calculating the MSE of one
> graph/trace compared to another? I have an optimal movement that is
> generated by a bank of LEDs (placed on a computer screen) and can be
> plotted at a sampling rate of 1Hz. I have subjects track this optimal
> movement via feedback on the computer screen. They repeat this
> movement 5 times. Their actual movement is calculated and plotted on
> the same computer screen at a sampling rate of 67.3Hz.
>
> I can plot the 2 traces (optimal and actual) with VEE easily enough.
> But I want to calculate how much the actual movement trace differs
> from the optimal by using the MSE. I can work out the formula for MSE
> but the different sampling rates is throwing me a bit. Do I need to
> manually extrapolate the data points in the optimal movement's array
> to match the sampling rate of the actual movement's array and then run
> both arrays through the MSE formula? Can VEE export an array from a
> trace off a waveform or XY plot?

Yes you need to extrapolate-- but unless you want something other that first-order ( linear )extrapolation you don't need to write anything fancy. The "build aribtrary waveform" object can do the resampling for you.

Stan


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Stan Bischof  Agilent Technologies  707-577-3994  stan_bischof@agilent.com
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