Question: MAST - not getting Hurdle p values
gravatar for jka8119
3 months ago by
jka81190 wrote:


I am trying to follow analysis steps as outlined in

I run into an issue when running

summaryDt <- summaryCond$datatable 

fcHurdle <- merge(summaryDt[contrast=='conditionStim' & component=='H',.(primerid, `Pr(>Chisq)`)], #hurdle P values summaryDt[contrast=='conditionStim' & component=='logFC', .(primerid, coef, ci.hi, ci.lo)], by='primerid') #logFC coefficients

My summaryCond$datatable only has 'C', 'D', 'S' and 'logFC' components but not 'H'. Because of this issue, I cannot perform subsequent MAST analysis steps. Not sure what I am doing incorrectly. I am comparing single cell RNA-seq data from two groups of cells.

Any help would be appreciated!


R version 3.4.1 (2017-06-30)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

Matrix products: default

[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252    LC_MONETARY=English_United States.1252 LC_NUMERIC=C                          
[5] LC_TIME=English_United States.1252    

attached base packages:
[1] stats4    parallel  stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
 [1] MAST_1.4.1                              SummarizedExperiment_1.8.1              DelayedArray_0.4.1                      matrixStats_0.53.1                     
 [5] RColorBrewer_1.1-2                      rsvd_0.9                                NMF_0.20.6                              cluster_2.0.6                          
 [9] rngtools_1.2.4                          pkgmaker_0.22                           registry_0.5                            stringr_1.3.0                          
[13] TxDb.Hsapiens.UCSC.hg19.knownGene_3.2.2 GenomicFeatures_1.30.3                  GenomicRanges_1.30.2                    GenomeInfoDb_1.14.0                    
[17] knitr_1.20                              data.table_1.10.4-3                     reshape2_1.4.3                          limma_3.34.8                           
[21] GSEABase_1.40.1                         graph_1.56.0                            annotate_1.56.1                         XML_3.98-1.10                          
[25] AnnotationDbi_1.40.0                    IRanges_2.12.0                          S4Vectors_0.16.0                        Biobase_2.38.0                         
[29] BiocGenerics_0.24.0                     GGally_1.3.2                            ggplot2_2.2.1                          

loaded via a namespace (and not attached):
 [1] httr_1.3.1               RMySQL_0.10.13           bit64_0.9-7              foreach_1.4.4            assertthat_0.2.0         blob_1.1.0              
 [7] GenomeInfoDbData_1.0.0   Rsamtools_1.30.0         progress_1.1.2           pillar_1.1.0             RSQLite_2.0              lattice_0.20-35         
[13] digest_0.6.15            XVector_0.18.0           colorspace_1.3-2         Matrix_1.2-12            plyr_1.8.4               pkgconfig_2.0.1         
[19] biomaRt_2.34.2           zlibbioc_1.24.0          xtable_1.8-2             scales_0.5.0             BiocParallel_1.12.0      tibble_1.4.2            
[25] lazyeval_0.2.1           magrittr_1.5             memoise_1.1.0            doParallel_1.0.11        tools_3.4.1              prettyunits_1.0.2       
[31] gridBase_0.4-7           munsell_0.4.3            Biostrings_2.46.0        compiler_3.4.1           rlang_0.2.0              grid_3.4.1              
[37] RCurl_1.95-4.10          iterators_1.0.9          bitops_1.0-6             gtable_0.2.0             codetools_0.2-15         abind_1.4-5             
[43] DBI_0.7                  reshape_0.8.7            R6_2.2.2                 GenomicAlignments_1.14.1 rtracklayer_1.38.3       bit_1.1-12              
[49] stringi_1.1.6            Rcpp_0.12.15            

ADD COMMENTlink modified 3 months ago by Andrew_McDavid120 • written 3 months ago by jka81190

Are you directly cutting and pasting code from vignette and seeing this issue?

ADD REPLYlink written 3 months ago by Andrew_McDavid120


Correct. The interesting things is that MAST correctly identifies differentially expressed genes but does not give me the Hurdle p value. 


ADD REPLYlink written 3 months ago by jka81190

I am unable to replicate.  The vignette compiles fine and summaryCond$datatable contains all the expected components:


C D H logFC S 6900 6900 2300 4600 6900

Are you trying to adapt the code in the vignette to your own data and it's not working?

ADD REPLYlink modified 3 months ago • written 3 months ago by Andrew_McDavid120

Yes. Please see below. My starting data is 'normmatrix', a numeric matrix with genes as rows and cells as columns.


>options(stringsAsFactors = F)
>genes <-, stringsAsFactors = F)
>colnames(genes) <- "gene"
>rownames(genes) <- genes$gene
>colnames(cellidentities) <- "celltype"
>cellidentities$celltype <- as.character(cellidentities$celltype)

>sle <- normmatrix[,row.names(subset(cellidentities, cellidentities$celltype %in% c("Th_conv", "Plasma_cells")))]
>cellsubset <- subset(cellidentities, cellidentities$celltype %in% c("Th_conv", "Plasma_cells"))
>scaRaw <- FromMatrix(as.matrix(sle), cellsubset, subset(genes, genes$gene %in% row.names(sle)))

>cdr2 <-colSums(assay(scaRaw)>0)

>colData(scaRaw)$cngeneson <- scale(cdr2)

>zlmCond <- zlm(~condition+cngeneson, scaRaw)

>summaryCond <- summary(zlmCond, doRLT = 'conditionPlasma_cells', logFC = TRUE, level = 0.95) 

>summaryDt <- summaryCond$datatable


ADD REPLYlink written 3 months ago by jka81190

What is the output of 

summaryCond <- summary(zlmCond, doRLT = TRUE, logFC = TRUE, level = 0.95)
table(summaryCond$datatable$component, summaryCond$datatable$contrast, exclude = NULL)


ADD REPLYlink written 3 months ago by Andrew_McDavid120

Please see below.

> table(summaryCond$datatable$component, summaryCond$datatable$contrast, exclude = NULL)
        (Intercept) cngeneson conditionPlasma_cells
  C           20922     20922                 20922
  D           20922     20922                 20922
  logFC           0     20922                 20922
  S           20922     20922                 20922

ADD REPLYlink written 3 months ago by jka81190
gravatar for Andrew_McDavid
3 months ago by
Andrew_McDavid120 wrote:

There is a typo in the arguments to `summary`: `doRLT` should read `doLRT`.  No error is triggered because the generic signature includes `...`.

Perhaps the function should check that all of the dot args match and throw an error manually?

ADD COMMENTlink written 3 months ago by Andrew_McDavid120

It was the typo. Sometimes it is the smallest things... I appreciate your help.

ADD REPLYlink written 3 months ago by jka81190
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