meaning of exponential factor in MATLAB output

Question

评论： Zahra Yousefi Darani 2022-7-8

I got these P.values:

1.0e-112 *

0.0000 0.0000 0.0000 0.1819

Even with format short, I see this : 1.0e-112 *

What does it mean?

Answer 1

Adam Danz 2022-7-8

编辑：Adam Danz 2022-7-8

1.0e-112 is 100 septrigintillionths or

or 0.0000.....1 where there are 111 zeros to the right of the decimal place.

Multiply that value by the vector of p values to get calculated p value.

1.0e-112 * 0.1819
ans = 1.8190e-113

Now it's 0.000........1819 with 112 0s to the right of the decimal before the ending.

In other words, the p value would be considered "highly significant" and you can reject the null hypothesis.

See also format options, though none of them will show 100+ leading 0s.

Great! Thanks!