What does 1.009e-12 mean?

[Yao Zhao]

What does 1.009e-12 mean? Can you show it in a decimal expression?

How to transfer it to decimal expression in Stata?

This number is from

display Ftail(1, 602, 53.08)

[Joseph Coveney]

How to transfer it to decimal expression in Stata?

display %014.12f Ftail(1, 602, 53.08)

[William Lisowski]

1.009e-12 is a number displayed in Stata's "exponential format" (known in the days of FORTRAN as "scientific notation"). See the output of

help format##eformat

for a fuller explanation. Meanwhile, some examples.

. display Ftail(1, 602, 53.08)
1.009e-12

. display %24.19f Ftail(1, 602, 53.08)
   0.0000000000010087558

. display %24.7e Ftail(1, 602, 53.08)
           1.0087558e-12

[Nick Cox]

Otherwise put, it's a trillionth plus a smidgen.