Systems and methods for evaluating the significance of differences in biological measurements
First Claim
1. A method of estimating a significance d in a difference between a measurement of a cellular constituent in a first microarray experiment and a measurement of the cellular constituent in a second microarray experiment comprising:
- computing on a suitably programmed computer
whereinX is a brightness of a probe spot representing said cellular constituent in said first microarray experiment;
Y is a brightness of a probe spot representing said cellular constituent in said second microarray experiment;
σ
X2 is a variance term for X that represents an additive error level in X;
σ
Y2 is a variance term for Y that represents an additive error level in Y;
f is a fractional multiplicative error level;
σ
X2+f2X2 is an estimated variance for X; and
σ
Y2+f2Y2 is an estimated variance for Y.
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Abstract
A method for fluorophore bias removal in microarray experiments in which the fluorophores used in microarray experiment pairs are reversed. Further, a method for calculating the individual errors associated with each measurement made in nominally repeated microarray experiments. This error measurement is optionally coupled with rank based methods in order to determine a probability that a cellular constituent is up or down regulated in response to a perturbation. Finally, a method for determining the confidence in the weighted average of the expression level of a cellular constituent in nominally repeated microarray experiments.
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Citations
17 Claims
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1. A method of estimating a significance d in a difference between a measurement of a cellular constituent in a first microarray experiment and a measurement of the cellular constituent in a second microarray experiment comprising:
-
computing on a suitably programmed computer
whereinX is a brightness of a probe spot representing said cellular constituent in said first microarray experiment; Y is a brightness of a probe spot representing said cellular constituent in said second microarray experiment; σ
X2 is a variance term for X that represents an additive error level in X;σ
Y2 is a variance term for Y that represents an additive error level in Y;f is a fractional multiplicative error level; σ
X2+f2X2 is an estimated variance for X; andσ
Y2+f2Y2 is an estimated variance for Y.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification