Sigma Clipping Page (1-D Fit Properties)
This page sets the sigma clipping parameters for
iterative data rejection in the
1-D Fit Package. This process iterates, or cycles, to
reject points and re-calculate the fit until some completion test
is passed. At each cycle, the fit is performed and, for each point,
its distance above or below the fit is compared with the standard
deviation of the fit. If a point is too deviant, it is marked for
rejection. When all points have been tested, the fit is re-computed
using only the remaining points. criterion. Iteration stops when
either the specified maximum number of iterations is reached or no
more points are rejected. Also see
Sigma Clipping the 1-D Fit.
Rejection is based on an n-sigma algorithm, in which the standard deviation,
sigma, is multiplied by some number,
n, to determine the rejection
threshold. The value of sigma is
updated each iteration. The current method modified the n-sigma
method by allowing different values for the upper and lower
clipping thresholds, n.
Sigma Clipping Properties
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Sigmas Above
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The value, n, in the n-sigmas upper threshold.
Values further than n-sigmas above the fit will be rejected from
it.
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Sigmas Below
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The value, n, in the n-sigmas lower threshold.
Values further than n-sigmas below the fit will be rejected from
it.
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Iterations
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The maximum number of iterations, or cycles, of
data rejection. Mira will take an "early out" to exit the iteration
before this value if no more points are rejected.
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Related Topics
1-D Fit Package
1-D Fit Properties
Sigma Clipping the 1-D Fit
1-D Fit Properties
Mira Pro x64 8.67 User's Guide, Copyright Ⓒ 2023 Mirametrics, Inc.
All Rights Reserved.
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