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. Author manuscript; available in PMC: 2009 Nov 3.
Published in final edited form as: Anal Chim Acta. 2008 Sep 11;628(2):155–161. doi: 10.1016/j.aca.2008.09.010

Table 3. Effects and interactions of all tested parameters including signal-to-noise t-ratios for each case, based on number of peaks in the output spectra.

(A) Effects for each parameter were calculated using the average number of peaks found for each of the 16 configurations. Signal-to-noise-ratios were then found by dividing each effect by the calculated standard deviation. (B) Similarly, interactions and their respective t-ratios were also calculated by using the average number of peaks in accordance with the standard deviation.

A. Main effects
Factors of Interest
A B C D
Main Effects 144.6 −38.79 5.042 −30.63
signal-to-noise t-ratio 9.993 −2.680 0.348 −2.116
significance (|te|>t95) YES YES NO YES
B. Interaction effects
Interactions Between Factors
AB AC AD BC BD CD ABC ABD BCD ABCD
Interaction Effects 57.04 6.208 −44.29 4.292 19.46 4.458 6.958 29.96 −2.458 57.04
signal-to-noise t-ratio 3.941 0.429 −3.060 0.297 1.345 0.308 0.481 2.070 −0.170 0.705
significance (|te|>t95) YES NO YES NO NO NO NO YES NO NO