#include <output/table.h>
#include <data/format.h>
+#include "minmax.h"
#include "xalloc.h"
#include "xmemdup0.h"
for (i = 0; i < proc->n_pairs; i++)
{
struct pair *pair = &proc->pairs[i];
+ double df = pair->n - 2;
double p, q;
- double df = pair->n -2;
- double correlation_t = (pair->correlation * sqrt (df) /
- sqrt (1 - pow2 (pair->correlation)));
+
+ /* corr2 will mathematically always be in the range [0, 1.0]. Inaccurate
+ calculations sometimes cause it to be slightly greater than 1.0, so
+ force it into the correct range to avoid NaN from sqrt(). */
+ double corr2 = MIN (1.0, pow2 (pair->correlation));
+ double correlation_t = pair->correlation * sqrt (df) / sqrt (1 - corr2);
/* row headings */
tab_text_format (table, 0, i + 1, TAB_LEFT | TAT_TITLE,