Significance of a linear trend

Hi,
I am trying to calculate statistical significance of a linear trend. Could
any please check if my code is correct? I just want to make sure if the
trend is significant (>99%).
Thanks,
Mahesh

Attached below is the code:
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rc_pdo = regline(time,pdo)

df_pdo= rc_pdo@nptxy-2;degrees of freedom
prob_pdo= (1 - betainc(df_pdo/(df_pdo+rc_pdo@tval^2), df_pdo/2.0, 0.5) )

if (prob_pdo .ge. 0.99) then

print("PDO TREND IS SIGNIFICANT (>99%)")

end if

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Received on Sat Nov 23 17:23:17 2013