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DGEobj.utils: A toolkit facilitating a limma/voom workflow Differential Gene Expression analysis
This package implements a set of utility functions to enable a limma/voom workflow capturing the results in the DGEobj data structure. Aside from implementing a well developed and popular workflow in DGEobj format, the run* functions in the package illustrate how to wrap the individual processing steps in a workflow in functions that capture important metadata, processing parameters, and intermediate data items in the DGEobj data structure. This function- based approach to utilizing the DGEobj data structure insures consistency among a collection of projects processed by these methods and thus facilitates downstream automated meta-analysis.
Functionality includes: Analysis
- runContrasts: Build contrast matrix and calculate contrast fits
- runEdgeRNorm: Run edgeR normalization on DGEobj
- runIHW: Apply Independent Hypothesis Weighting (IHW) to a list of topTable dataframes
- runPower: Run a power analysis on counts and design matrix
- runQvalue: Calculate and add q-value and lFDR to dataframe
- runSVA: Test for surrogate variables
- runVoom: Run functions in a typical voom/lmFit workflow
Utilities
- convertCounts: Convert count matrix to CPM, FPKM, FPK, or TPM
- extractCol: Extract a named column from a series of df or matrices
- lowIntFilter: Apply low intensity filters to a DGEobj
- rsqCalc: Calculate R-squared for each gene fit
- summarizeSigCounts: Summarize a contrast list
- topTable.merge: Merge specified topTable df cols
- tpm.direct: Convert countsMatrix and geneLength to TPM units
- tpm.on.subset: Calculate TPM for a subsetted DGEobj
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