Hi All,

How are you doing.

I am interested in calculating significance test for annual percent

change(APC). I was able to calculate annual percent change in SAS by

PROC REG but i am not able to calculate significance level in SAS.

please see description below.

The Annual Percent Change (APC) is calculated by fitting a least

squares regression line to the natural logarithm of the rates, using

the calendar year as a regressor variable.

n = number of years

r = rates

y = Ln(r)

x = calendar year

y = mx + b

APC = 100 * (em - 1)

Significance Test: APC to 0

Testing the hypothesis that the APC is equal to zero is equivalent to

testing the hypothesis that the regression parameter m is equal to

zero. The hypothesis is rejected at a significance level p if

ProbT(abs(m/SEm), n-2)>= 1-p/2, where ProbT(x,n) is the t distribution

function evaluated at x and with n degrees of freedom, and where SEm

is the standard error of m from the regression.

could you please let me know how do i calculate t-test for the above.

Kind Regards,

Raju.