Determine the student factor
retval = studentfactor(n, p)
number of values in the sample distribution
statistical confidence level (%) as a string or the level of significance (alpha) as a decimal value, "95%", "99%", "99.9%" or 0.05, 0.01, 0.001 resp (see examples).
student factor
Determine the student factor from the internal t-table and interpolate the value if necessary. It is a service function for ST_strayarea() and ST_trustarea().
R. Kaiser, G. Gottschalk; "Elementare Tests zur Beurteilung von Meßdaten", BI Hochschultaschenbücher, Bd. 774, Mannheim 1972.