STUDENT_T_CUTOFF function

STUDENT_T_CUTOFF (P, nf)  Returns the student - t cutoff

Returns the student's - t cutoff for the given confidence limit and degrees of freedom.

Examples:

yes?  ! for the correct result send the number in the sample, plus 1.
yes? let nf = `var,return=Lsize` + 1
yes? let student_cutoff = STUDENT_T_CUTOFF( 95, nf )

The function STUDENT_T_CUTOFF is called by the script correlation_with_students_t_test.jnl, taking definitions made by a call to  the script variance.jnl to return the degrees of freedom, covariance, correlation, correlation for confidence level P.  To see the script's description:

yes? go/help correlation_with_students_t_test

\can mode verify

! correlation_with_students_t_test: computes correlation, r, between 2 variables (e.g. time series)
!  and answers the question via a students t test:
! Is r significantly different from 0 with 90, 95 or 99 percent confidence?  These are your only 3 input choices.  

! First, run VARIANCE.JNL with its required inputs (see VARIANCE.JNL documentation).
! Then run this script.   
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