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<ref name=ZhangPharmacogenomics2010>{{cite journal |author=Zhang XHD
|title= Assessing the size of gene or RNAi effects in multifactor high-throughput experiments
|journal=Pharmacogenomics |volume=11 |issue= |pages=
|year=2010 |month= |pmid= |doi=10.2217/PGS.09.136 |url=}}</ref>. The commonly used dual-flashlight plot is for the difference between two groups in high-throughput experiments such as [[microarray]]s and [[high-throughput screening]] studies, in which we plot the [[SSMD]] versus average log fold-change on the ''y''- and ''x''-axes, respectively, for all genes or compounds (such as [[siRNA]]s or [[small molecule]]s) investigated in an experiment <ref name=ZhangPharmacogenomics2010>{{cite journal |author=Zhang XHD
|title= Assessing the size of gene or RNAi effects in multifactor high-throughput experiments
|journal=Pharmacogenomics |volume=11 |issue= |pages=
|year=2010 |month= |pmid= |doi=10.2217/PGS.09.136 |url=}}</ref>.
As a whole, the points in a dual-flashlight plot look like the beams of a flashlight with two heads, hence the name dual-flashlight plot <ref name=ZhangPharmacogenomics2010>{{cite journal |author=Zhang XHD
|title= Assessing the size of gene or RNAi effects in multifactor high-throughput experiments
|journal=Pharmacogenomics |volume=11 |issue= |pages=
|year=2010 |month= |pmid= |doi=10.2217/PGS.09.136 |url=}}</ref>.
With the dual-flashlight plot, we can see how the genes or compounds are distributed into each category in effect sizes, as shown in the figure. Meanwhile, we can also see the average fold-change for each gene or compound. The dual-flashlight plot is similar to the [[volcano plot]]. In a [[volcano plot]], the [[p-value]] (or [[q-value]]), instead of SMCV or SSMD, is plotted against average fold-change <ref name=Jin2001>{{cite journal |author=Jin W, Riley RM, Wolfinger RD, White KP, Passador-Gurgel G, Gibson G
|title= The contributions of sex, genotype and age to transcriptional variance in Drosophila melanogaster
|journal= Nature Genetics |volume=29 |issue= |pages=
|year=2001 |month= |pmid= |doi= 10.1038/ng766 |url=}}</ref>
<ref name=Cui2003>{{cite journal |author= Cui X, Churchill GA
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<ref name=ZhangSBR2010>{{cite journal |author=Zhang XHD
|title= Strictly standardized mean difference, standardized mean difference and classical t-test for the comparison of two groups
|journal= Statistics in Biopharmaceutical Research |volume=2 |issue= |pages=
|year=2010 |month= |pmid= |doi=10.1198/sbr.2009.0074 |url=}}</ref>. Hence, the value of SMCV is comparable whereas the value of [[p-value]] or [[q-value]] is incomparable in experiments with different sample size, especially when many investigated genes or compounds do not have exactly zero effects. The dual-flashlight plot bears the same advantage that the SMCV has, as compared to the [[volcano plot]].
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