A Modified Sequential Probability Ratio Test (MSPRT) // Given the
maximum available sample size (N) for an experiment, and the
target levels of Type I and II error probabilities, this
package designs a modified SPRT (MSPRT). For any designed MSPRT
the package can also obtain its operating characteristics and
implement the test for a given sequentially observed data. The
MSPRT is defined in a manner very similar to Wald's initial
proposal. The proposed test has shown evidence of reducing the
average sample size required to perform statistical hypothesis
tests at specified levels of significance and power. Currently,
the package implements one-sample proportion tests, one and
two-sample z tests, and one and two-sample t tests. A brief
user guidance for this package is provided below. One can also
refer to the supplemental information for the same.