Use this function to find a constant value of alpha to be used for transforming count data.
The power transformation parameter
alpha, which approximately fits transformed data to Poisson log
linear model, is selected using a grid search within the interval [0, 1].
FindBestTransform(x, grid.length = 50)
a n-by-p data frame or matrix of count data. Samples should be in the rows.
how many distinct points of alpha should be searched within the interval [0, 1]? Default is 50.
the value of alpha to be use within power transformation.
This function is copied from
PoiClaClu package and modified to control the total number of grid search.
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