project_basis: This function projects an aligned trait onto the basis...
In ollyburren/cupcake: PCA for GWAS

This function projects an aligned trait onto the basis project_basis projects an external trait into basis space

project_basis(
  gwas.DT,
  shrink.DT,
  pc,
  traitname = "test_trait",
  apply.shrinkage = TRUE
)

`gwas.DT`	data.table object representing summary statistics from external GWAS with columns as defined in `get_gwas_data`
`shrink.DT`	data.table object of matching shrinkage estimates returned by `compute_shrinkage_metrics`
`pc`	prcomp object returned by `create_basis`
`traitname`	character label for this trait defaults to 'test_trait'
`apply.shrinkage`	- boolean value on whether to apply shrinkage prior to projection.