optSample: Function optSample
In CshlSiepelLab/ACE: Analysis of CRISPR Essentiality in R

Given guide and gene parameters, use MLE to obtain sample parameters. Sample parameters assumed to be independent, so 1D optimization used. All samples present in user_DataObj are used.

optSample(
  sample_effects,
  gene_effects,
  guide_efficiency,
  use_genes,
  write_log,
  user_DataObj,
  user_ModelObj
)

`sample_effects`	Sample effects to use on initiailization.
`gene_effects`	By-gene essentiality parameters.
`guide_efficiency`	By-guide efficiency parameters.
`use_genes`	Vector of gene names to use when estimating sample parameters.
`write_log`	Function to write to central timestamped log file.
`user_DataObj`	DataObject with experimental data to analyze.
`user_ModelObj`	ModelObject with preprocessed model parameters.