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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> 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
--------------------------------------------------------------------------
Stan Bischof Agilent Technologies 707-577-3994 stan_bischof@agilent.com
--------------------------------------------------------------------------
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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?
Regards
Alex
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