threshold_conversion: Pval_threshold to threshold conversion
In ammeir2/CoReAnalysis:

Converts p-value threshold to test-statistic threshold, or the other way around.

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threshold_conversion(x, test_statistic = c("z", "t", "F", "chisq",
  "correlation"), pval_threshold = 0.05, threshold = NULL, df1 = NULL,
  df2 = NULL)

`x`	the observed test-statistic.
`test_statistic`	the type of test-statistic
`pval_threshold`	the threshold a pvalue must cross (be lesser than) in order for the test-statistic to be observed. Only one of `pval_threshold` or `threshold` must be specified, and the other one must be set to NULL.
`threshold`	an alternative way to specifiy a threshold. If a z, t, or correlation then selection rule is assumed to be `abs(x) > threshold`. If F or chisq then the selection rule is assumed to be `x > threshold`. Takes precedence to `pval_threshold`. Only one of `pval_threshold` or `threshold` must be specified, and the other one must be set to NULL.
`df1`	the degrees of freedom for t and chisq statistics. The sample size for Pearson's correlation. The numerator degrees of freedom for an F statistic.
`df2`	the denominator degrees of freedom for an F statistic.