Changes between Version 7 and Version 8 of GuarDyan_PhysModel


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Timestamp:
Feb 13, 2018, 3:12:30 PM (7 years ago)
Author:
dieda
Comment:

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  • GuarDyan_PhysModel

    v7 v8  
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    34 As a result a total of some 445 000 data points were compared at the final stage.
     34As a result a total of some 445 000 data points were compared at the final stage. A reduced $\chi$^2 ^-like statistics was calculated as:
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    3636$\chi ^{2}=\frac{1}{N}\sum_{i=1}^{N}\frac{(y_{MCNP,i}-y_{GUARDYAN,i})^{2}}{\sigma_{MCNP,i}^{2}-\sigma_{GUARDYAN,i}^{2}}$
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    38 
     38where ''N'' is the number of ''i'' data points for a single isotope a single starting energy (i.e. N= 9x 24 = 216 ), $\sigma$ stands for the standard deviation of the Monte Carlo estimates  and y is the tally results. It means that squared difference is compared against the sum of squared standard deviations, thus $\chi$^2^ should be below 1 is if the results fall within 1 standard deviation, in most cases it should be below 2 and results above 3 should be rare.
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