arrayQualityMetrics problem with Agilent 2-colour
1
0
Entering edit mode
Edwin Groot ▴ 230
@edwin-groot-3606
Last seen 10.2 years ago
Hello all, Would anyone know of a simple way to plot the heatmap in arrayQualityMetrics on a per-channel basis, rather than the per-array basis? I have 16 2-colour Agilent arrays read in by the LIMMA package, but arrayQualityMetrics shows only 16 arrays in the heatmap, rather than the 32 red and green samples that I would expect. When one array is an outlier in the heatmap, I do not know which sample (red or green) is at fault. The code that I used is quite simple: > library(limma) > library(arrayQualityMetrics) > targets <- readTargets("qc.exp") > RG <- read.maimages(targets$FileName, source="agilent") > arrayQualityMetrics(expressionset=RG, outdir="default", force = TRUE, do.logtransform = TRUE) The directory 'default' has been created. KernSmooth 2.23 loaded Copyright M. P. Wand 1997-2009 (loaded the KernSmooth namespace) [[1]] [[2]] I also attempted a custom call to aqm.* functions. However, the preparatory step fails: > RGprep = aqm.prepdata(expressionset=RG, do.logtransform = TRUE) Error in function (classes, fdef, mtable) : unable to find an inherited method for function "aqm.prepdata", for signature "RGList" > sessionInfo() R version 2.11.1 (2010-05-31) i486-pc-linux-gnu locale: [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C [3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 [5] LC_MONETARY=C LC_MESSAGES=en_US.UTF-8 [7] LC_PAPER=en_US.UTF-8 LC_NAME=C [9] LC_ADDRESS=C LC_TELEPHONE=C [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] arrayQualityMetrics_2.6.0 affyPLM_1.24.0 [3] preprocessCore_1.10.0 gcrma_2.20.0 [5] affy_1.26.1 Biobase_2.8.0 [7] limma_3.4.2 loaded via a namespace (and not attached): [1] affyio_1.16.0 annotate_1.26.0 AnnotationDbi_1.10.1 [4] beadarray_1.16.0 Biostrings_2.16.3 DBI_0.2-5 [7] genefilter_1.30.0 grid_2.11.1 hwriter_1.2 [10] IRanges_1.6.4 lattice_0.18-8 latticeExtra_0.6-11 [13] marray_1.26.0 RColorBrewer_1.0-2 RSQLite_0.9-1 [16] simpleaffy_2.24.0 splines_2.11.1 stats4_2.11.1 [19] survival_2.35-8 tools_2.11.1 vsn_3.16.0 [22] xtable_1.5-6 Thanks in advance, Edwin -- Dr. Edwin Groot, postdoctoral associate AG Laux Institut fuer Biologie III Schaenzlestr. 1 79104 Freiburg, Deutschland +49 761-2032945
limma limma • 1.4k views
ADD COMMENT •
0
Entering edit mode
@audrey-kauffmann-3982
Last seen 10.2 years ago
Hi Edwin, arrayQualityMetrics is not really appropriate for that, maybe you can consider using the clustering and heatmap functions outside from the package. Also, regarding using aqm.prepdata on a RGList is not implemented, you would first need to convert your RGList into a NChannelSet. A trick, not recommended but which would work, is to convert your RGList as an ExpressionSet (usually for one channel) where each R and G channels would be treated as separated chips, then use aqm.prepdata and aqm.heatmap. Please let me know if you have more questions regarding this, Audrey 2010/6/23 Edwin Groot <edwin.groot at="" biologie.uni-freiburg.de="">: > Hello all, > Would anyone know of a simple way to plot the heatmap in > arrayQualityMetrics on a per-channel basis, rather than the per- array > basis? > > I have 16 2-colour Agilent arrays read in by the LIMMA package, but > arrayQualityMetrics shows only 16 arrays in the heatmap, rather than > the 32 red and green samples that I would expect. When one array is an > outlier in the heatmap, I do not know which sample (red or green) is at > fault. > > The code that I used is quite simple: >> library(limma) >> library(arrayQualityMetrics) >> targets <- readTargets("qc.exp") >> RG <- read.maimages(targets$FileName, source="agilent") >> arrayQualityMetrics(expressionset=RG, outdir="default", force = TRUE, > do.logtransform = TRUE) > The directory 'default' has been created. > KernSmooth 2.23 loaded > Copyright M. P. Wand 1997-2009 > (loaded the KernSmooth namespace) > [[1]] > [[2]] > > I also attempted a custom call to aqm.* functions. However, the > preparatory step fails: >> RGprep = aqm.prepdata(expressionset=RG, do.logtransform = TRUE) > Error in function (classes, fdef, mtable) ?: > ?unable to find an inherited method for function "aqm.prepdata", for > signature "RGList" > >> sessionInfo() > R version 2.11.1 (2010-05-31) > i486-pc-linux-gnu > > locale: > ?[1] LC_CTYPE=en_US.UTF-8 ? ? ? LC_NUMERIC=C > ?[3] LC_TIME=en_US.UTF-8 ? ? ? ?LC_COLLATE=en_US.UTF-8 > ?[5] LC_MONETARY=C ? ? ? ? ? ? ?LC_MESSAGES=en_US.UTF-8 > ?[7] LC_PAPER=en_US.UTF-8 ? ? ? LC_NAME=C > ?[9] LC_ADDRESS=C ? ? ? ? ? ? ? LC_TELEPHONE=C > [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C > > attached base packages: > [1] stats ? ? graphics ?grDevices utils ? ? datasets ?methods ? base > > > other attached packages: > [1] arrayQualityMetrics_2.6.0 affyPLM_1.24.0 > [3] preprocessCore_1.10.0 ? ? gcrma_2.20.0 > [5] affy_1.26.1 ? ? ? ? ? ? ? Biobase_2.8.0 > [7] limma_3.4.2 > > loaded via a namespace (and not attached): > ?[1] affyio_1.16.0 ? ? ? ?annotate_1.26.0 ? ? ?AnnotationDbi_1.10.1 > ?[4] beadarray_1.16.0 ? ? Biostrings_2.16.3 ? ?DBI_0.2-5 > ?[7] genefilter_1.30.0 ? ?grid_2.11.1 ? ? ? ? ?hwriter_1.2 > [10] IRanges_1.6.4 ? ? ? ?lattice_0.18-8 ? ? ? latticeExtra_0.6-11 > [13] marray_1.26.0 ? ? ? ?RColorBrewer_1.0-2 ? RSQLite_0.9-1 > [16] simpleaffy_2.24.0 ? ?splines_2.11.1 ? ? ? stats4_2.11.1 > [19] survival_2.35-8 ? ? ?tools_2.11.1 ? ? ? ? vsn_3.16.0 > [22] xtable_1.5-6 > > Thanks in advance, > Edwin > -- > Dr. Edwin Groot, postdoctoral associate > AG Laux > Institut fuer Biologie III > Schaenzlestr. 1 > 79104 Freiburg, Deutschland > +49 761-2032945 > > _______________________________________________ > Bioconductor mailing list > Bioconductor at stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/bioconductor > Search the archives: http://news.gmane.org/gmane.science.biology.informatics.conductor > -- Audrey Kauffmann Bergonie Cancer Institute 229 Cours de l'Argonne 33076 Bordeaux France +33.5.56.33.04.53
ADD COMMENT •
0
Entering edit mode
Thanks for the reply Audrey On Wed, 23 Jun 2010 16:51:08 +0200 Audrey Kauffmann <ak.bergonie at="" gmail.com=""> wrote: > Hi Edwin, > > arrayQualityMetrics is not really appropriate for that, maybe you can > consider using the clustering and heatmap functions outside from the > package. > This might be the best solution for the time being. I also tried the arrayQuality package, but it keeps asking me for my mouse annotations. Unfortunately, I work with neither mice nor humans, but with Arabidopsis (those green thingies that photosynthesize). Some searching on the Internet (sorry, I lost the source) gave the tip of using Pearson correlation for distance measures of arrays. I came up with the following code snippet, but I do not know if this is an appropriate distance measure for RAW intensity values. The Pearson correlation is 0 to 1, with 1 being perfect correlation between a pair of arrays. What additional code is needed to determine outliers by setting a 1.5 * IQR threshold? I have to do something with object d, correct? #Generate correlation matrix for green and red channels allGR <- cbind(RG$G,RG$R) d <- cor(allGR, method="pearson") #Plot dendrogram of distances plot(hclust(dist(1-d))) #Plot heatmap of all samples against all heatmap(d, Rowv=NA, Colv=NA, symm=TRUE) > Also, regarding using aqm.prepdata on a RGList is not implemented, > you > would first need to convert your RGList into a NChannelSet. > I have tried this conversion, but I received an error from aqm.heatmap. RGNC <- as(RG, "NChannelSet") RGprep = aqm.prepdata(expressionset=RGNC, do.logtransform = TRUE) hm <- aqm.heatmap(dataprep=RGNC) Error in if (n < 2) stop("must have n >= 2 objects to cluster") : argument is of length zero That is too bad. The RGprep object has slots for number of channels and for the sample names. > A trick, not recommended but which would work, is to convert your > RGList as an ExpressionSet (usually for one channel) where each R and > G channels would be treated as separated chips, then use aqm.prepdata > and aqm.heatmap. > Another reason that I have read against this option is the raw intensity I read into my RGList is not expression, and therefore not appropriate for an ExpressionSet. I might open a semantic can of worms, but I think the 2-colour specialists consider the data as expression only after background subtraction, normalization and output of the log-ratios. Edwin -- > Please let me know if you have more questions regarding this, > Audrey > > 2010/6/23 Edwin Groot <edwin.groot at="" biologie.uni-freiburg.de="">: > > Hello all, > > Would anyone know of a simple way to plot the heatmap in > > arrayQualityMetrics on a per-channel basis, rather than the > per-array > > basis? > > > > I have 16 2-colour Agilent arrays read in by the LIMMA package, but > > arrayQualityMetrics shows only 16 arrays in the heatmap, rather > than > > the 32 red and green samples that I would expect. When one array is > an > > outlier in the heatmap, I do not know which sample (red or green) > is at > > fault. > > > > The code that I used is quite simple: > >> library(limma) > >> library(arrayQualityMetrics) > >> targets <- readTargets("qc.exp") > >> RG <- read.maimages(targets$FileName, source="agilent") > >> arrayQualityMetrics(expressionset=RG, outdir="default", force = > TRUE, > > do.logtransform = TRUE) > > The directory 'default' has been created. > > KernSmooth 2.23 loaded > > Copyright M. P. Wand 1997-2009 > > (loaded the KernSmooth namespace) > > [[1]] > > [[2]] > > > > I also attempted a custom call to aqm.* functions. However, the > > preparatory step fails: > >> RGprep = aqm.prepdata(expressionset=RG, do.logtransform = TRUE) > > Error in function (classes, fdef, mtable) ?: > > ?unable to find an inherited method for function "aqm.prepdata", > for > > signature "RGList" > > > >> sessionInfo() > > R version 2.11.1 (2010-05-31) > > i486-pc-linux-gnu > > > > locale: > > ?[1] LC_CTYPE=en_US.UTF-8 ? ? ? LC_NUMERIC=C > > ?[3] LC_TIME=en_US.UTF-8 ? ? ? ?LC_COLLATE=en_US.UTF-8 > > ?[5] LC_MONETARY=C ? ? ? ? ? ? ?LC_MESSAGES=en_US.UTF-8 > > ?[7] LC_PAPER=en_US.UTF-8 ? ? ? LC_NAME=C > > ?[9] LC_ADDRESS=C ? ? ? ? ? ? ? LC_TELEPHONE=C > > [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C > > > > attached base packages: > > [1] stats ? ? graphics ?grDevices utils ? ? datasets ?methods ? > base > > > > > > other attached packages: > > [1] arrayQualityMetrics_2.6.0 affyPLM_1.24.0 > > [3] preprocessCore_1.10.0 ? ? gcrma_2.20.0 > > [5] affy_1.26.1 ? ? ? ? ? ? ? Biobase_2.8.0 > > [7] limma_3.4.2 > > > > loaded via a namespace (and not attached): > > ?[1] affyio_1.16.0 ? ? ? ?annotate_1.26.0 ? ? ?AnnotationDbi_1.10.1 > > ?[4] beadarray_1.16.0 ? ? Biostrings_2.16.3 ? ?DBI_0.2-5 > > ?[7] genefilter_1.30.0 ? ?grid_2.11.1 ? ? ? ? ?hwriter_1.2 > > [10] IRanges_1.6.4 ? ? ? ?lattice_0.18-8 ? ? ? latticeExtra_0.6-11 > > [13] marray_1.26.0 ? ? ? ?RColorBrewer_1.0-2 ? RSQLite_0.9-1 > > [16] simpleaffy_2.24.0 ? ?splines_2.11.1 ? ? ? stats4_2.11.1 > > [19] survival_2.35-8 ? ? ?tools_2.11.1 ? ? ? ? vsn_3.16.0 > > [22] xtable_1.5-6 > > > > Thanks in advance, > > Edwin > > -- > > Dr. Edwin Groot, postdoctoral associate > > AG Laux > > Institut fuer Biologie III > > Schaenzlestr. 1 > > 79104 Freiburg, Deutschland > > +49 761-2032945 > > > > _______________________________________________ > > Bioconductor mailing list > > Bioconductor at stat.math.ethz.ch > > https://stat.ethz.ch/mailman/listinfo/bioconductor > > Search the archives: > http://news.gmane.org/gmane.science.biology.informatics.conductor > > > > > > -- > Audrey Kauffmann > Bergonie Cancer Institute > 229 Cours de l'Argonne > 33076 Bordeaux > France > +33.5.56.33.04.53
ADD REPLY •
0
Entering edit mode
Hi Edwin, To run the outlier detection on your distance matrix the same way it is done in the arrayQualityMetrics package (1.5*IQR), you need to compute the sum of the distances by sample and then use the function boxplot.stats with the default parameters. The outliers will be listed in the slot "out" from the object created with boxplot.stats. However I am not sure it would be as efficient with Pearson correlation as it is with the L1 distance that we are using in arrayQualityMetrics. It is worth comparing the two I guess. I hope that helps, Audrey 2010/6/24 Edwin Groot <edwin.groot at="" biologie.uni-freiburg.de="">: > Thanks for the reply Audrey > > On Wed, 23 Jun 2010 16:51:08 +0200 > ?Audrey Kauffmann <ak.bergonie at="" gmail.com=""> wrote: >> Hi Edwin, >> >> arrayQualityMetrics is not really appropriate for that, maybe you can >> consider using the clustering and heatmap functions outside from the >> package. >> > > This might be the best solution for the time being. I also tried the > arrayQuality package, but it keeps asking me for my mouse annotations. > Unfortunately, I work with neither mice nor humans, but with > Arabidopsis (those green thingies that photosynthesize). > Some searching on the Internet (sorry, I lost the source) gave the tip > of using Pearson correlation for distance measures of arrays. I came up > with the following code snippet, but I do not know if this is an > appropriate distance measure for RAW intensity values. The Pearson > correlation is 0 to 1, with 1 being perfect correlation between a pair > of arrays. > What additional code is needed to determine outliers by setting a 1.5 * > IQR threshold? I have to do something with object d, correct? > #Generate correlation matrix for green and red channels > ?allGR <- cbind(RG$G,RG$R) > ?d <- cor(allGR, method="pearson") > #Plot dendrogram of distances > ?plot(hclust(dist(1-d))) > #Plot heatmap of all samples against all > ?heatmap(d, Rowv=NA, Colv=NA, symm=TRUE) > > >> Also, regarding using aqm.prepdata on a RGList is not implemented, >> you >> would first need to convert your RGList into a NChannelSet. >> > > I have tried this conversion, but I received an error from aqm.heatmap. > ?RGNC <- as(RG, "NChannelSet") > ?RGprep = aqm.prepdata(expressionset=RGNC, do.logtransform = TRUE) > ?hm <- aqm.heatmap(dataprep=RGNC) > Error in if (n < 2) stop("must have n >= 2 objects to cluster") : > argument is of length zero > > That is too bad. The RGprep object has slots for number of channels and > for the sample names. > > >> A trick, not recommended but which would work, is to convert your >> RGList as an ExpressionSet (usually for one channel) where each R and >> G channels would be treated as separated chips, then use aqm.prepdata >> and aqm.heatmap. >> > > Another reason that I have read against this option is the raw > intensity I read into my RGList is not expression, and therefore not > appropriate for an ExpressionSet. I might open a semantic can of worms, > but I think the 2-colour specialists consider the data as expression > only after background subtraction, normalization and output of the > log-ratios. > > Edwin > -- >> Please let me know if you have more questions regarding this, >> Audrey >> >> 2010/6/23 Edwin Groot <edwin.groot at="" biologie.uni-freiburg.de="">: >> > Hello all, >> > Would anyone know of a simple way to plot the heatmap in >> > arrayQualityMetrics on a per-channel basis, rather than the >> per-array >> > basis? >> > >> > I have 16 2-colour Agilent arrays read in by the LIMMA package, but >> > arrayQualityMetrics shows only 16 arrays in the heatmap, rather >> than >> > the 32 red and green samples that I would expect. When one array is >> an >> > outlier in the heatmap, I do not know which sample (red or green) >> is at >> > fault. >> > >> > The code that I used is quite simple: >> >> library(limma) >> >> library(arrayQualityMetrics) >> >> targets <- readTargets("qc.exp") >> >> RG <- read.maimages(targets$FileName, source="agilent") >> >> arrayQualityMetrics(expressionset=RG, outdir="default", force = >> TRUE, >> > do.logtransform = TRUE) >> > The directory 'default' has been created. >> > KernSmooth 2.23 loaded >> > Copyright M. P. Wand 1997-2009 >> > (loaded the KernSmooth namespace) >> > [[1]] >> > [[2]] >> > >> > I also attempted a custom call to aqm.* functions. However, the >> > preparatory step fails: >> >> RGprep = aqm.prepdata(expressionset=RG, do.logtransform = TRUE) >> > Error in function (classes, fdef, mtable) ?: >> > ?unable to find an inherited method for function "aqm.prepdata", >> for >> > signature "RGList" >> > >> >> sessionInfo() >> > R version 2.11.1 (2010-05-31) >> > i486-pc-linux-gnu >> > >> > locale: >> > ?[1] LC_CTYPE=en_US.UTF-8 ? ? ? LC_NUMERIC=C >> > ?[3] LC_TIME=en_US.UTF-8 ? ? ? ?LC_COLLATE=en_US.UTF-8 >> > ?[5] LC_MONETARY=C ? ? ? ? ? ? ?LC_MESSAGES=en_US.UTF-8 >> > ?[7] LC_PAPER=en_US.UTF-8 ? ? ? LC_NAME=C >> > ?[9] LC_ADDRESS=C ? ? ? ? ? ? ? LC_TELEPHONE=C >> > [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C >> > >> > attached base packages: >> > [1] stats ? ? graphics ?grDevices utils ? ? datasets ?methods >> base >> > >> > >> > other attached packages: >> > [1] arrayQualityMetrics_2.6.0 affyPLM_1.24.0 >> > [3] preprocessCore_1.10.0 ? ? gcrma_2.20.0 >> > [5] affy_1.26.1 ? ? ? ? ? ? ? Biobase_2.8.0 >> > [7] limma_3.4.2 >> > >> > loaded via a namespace (and not attached): >> > ?[1] affyio_1.16.0 ? ? ? ?annotate_1.26.0 ? ? ?AnnotationDbi_1.10.1 >> > ?[4] beadarray_1.16.0 ? ? Biostrings_2.16.3 ? ?DBI_0.2-5 >> > ?[7] genefilter_1.30.0 ? ?grid_2.11.1 ? ? ? ? ?hwriter_1.2 >> > [10] IRanges_1.6.4 ? ? ? ?lattice_0.18-8 ? ? ? latticeExtra_0.6-11 >> > [13] marray_1.26.0 ? ? ? ?RColorBrewer_1.0-2 ? RSQLite_0.9-1 >> > [16] simpleaffy_2.24.0 ? ?splines_2.11.1 ? ? ? stats4_2.11.1 >> > [19] survival_2.35-8 ? ? ?tools_2.11.1 ? ? ? ? vsn_3.16.0 >> > [22] xtable_1.5-6 >> > >> > Thanks in advance, >> > Edwin >> > -- >> > Dr. Edwin Groot, postdoctoral associate >> > AG Laux >> > Institut fuer Biologie III >> > Schaenzlestr. 1 >> > 79104 Freiburg, Deutschland >> > +49 761-2032945 >> > >> > _______________________________________________ >> > Bioconductor mailing list >> > Bioconductor at stat.math.ethz.ch >> > https://stat.ethz.ch/mailman/listinfo/bioconductor >> > Search the archives: >> http://news.gmane.org/gmane.science.biology.informatics.conductor >> > >> >> >> >> -- >> Audrey Kauffmann >> Bergonie Cancer Institute >> 229 Cours de l'Argonne >> 33076 Bordeaux >> France >> +33.5.56.33.04.53 > > _______________________________________________ > Bioconductor mailing list > Bioconductor at stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/bioconductor > Search the archives: http://news.gmane.org/gmane.science.biology.informatics.conductor > -- Audrey Kauffmann Bergonie Cancer Institute 229 Cours de l'Argonne 33076 Bordeaux France +33.5.56.33.04.53
ADD REPLY •

Login before adding your answer.

Similar Posts
Loading Similar Posts
Traffic: 590 users visited in the last hour
Content Search
Users
Tags
Badges
Help About
FAQ
Access RSS
API
Stats

Use of this site constitutes acceptance of our User Agreement and Privacy Policy.

Powered by the version 2.3.6