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The signal to noise ratio of the array served as a measure of array quality and was the major target for optimization.
As with our study, while differences were detected between the platforms, all four arrays performed well in each measure of array quality.
However, the single most useful array quality measure appears to be GNUSE, since it provides a more general measure of array quality relative to a large set of publically available arrays.
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Results are presented for measures of array performance such as input signal power, directivity of sound radiation and accuracy of sound reproduction resulting from the application of conventional control methods such as minimization of error in mean squared pressure, maximization of energy difference and minimization of weighted pressure error and energy.
The effects of microarray age and cDNA quality on the measures of array CV were estimated.
When using semi-degraded RNA for gene expression studies, reliable measures of array quality provide valuable information that can be used to guide downstream analysis.
For Affymetrix arrays, the metrics described above lead to nine quantitative measures of array quality computed on each array: ABG (average background), SF (scale factor), PP (percent present), AR (actin 3′/5′ ratio), GR (GAPDH 3′/5′ ratio), median NUSE, median RLE, RLE-IQR (interquartile range of IQR per array, to measure variability in RLE) and RNAS (slope of RNA degradation measure).
Figure 4 Local electron mean free path versus the Fermi energy measured on array of several tip positions on pristine and irradiated graphene at different fluences.
Assessment of over 100 FFPE samples on Affymetrix Exon 1.0 ST arrays showed neither RNA integrity, 260/280, 260/230, concentration nor ST-cDNA yield correlates with percent DABG, a measure of Exon array quality control (data not shown).
An additional measure of overall array quality is the average signal to noise ratio (S/N = (intensityspot - intensitybackground)/σbackground).
The area of the mask in pixels is the measure of PRL-array size.
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CEO of Professional Science Editing for Scientists @ prosciediting.com