Importance sampling based p-values can be computed in two forms A) sum_i weight_i*X_i / N; B) sum_i weight_i*X_i / sum_i weight_i. This util function picks the better form.
A matrix with 4 columns. Column 1 uses form A Column 2 is the estimated variance of Column 1 Column 3 uses form B Column 4 is the estimated variance of Column 3.
A matrix of 2 columns. Column 1 is the p-value estimate. Column 2 is the estimated variance.
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