I have used the STDRATE procedure to get the estimates and standard errors for 5 different timeperiods between 1980-2000 in 5 years interval (1980, 1985, 1990, 1995 and 2000).
This means that I have point estimate and 95% CI for $X_1, X_2, X_3, X_4$ and $X_5$ which spans between the years 1980-2000.
For example i have the estimates with 95%Cl for
X1 = 22 (18 to 25),
X2= 30 (24 to 33)
X3= 14 (12 to 16)
X4= 10 (8 to 11)
X5= 6 (2-7)
Now if I wanted to calculate the absolute change with point estimates and 95% CI between the start of the study (i.e for X1) and the end (i.e X5), how do I do this?
A similar study have done this and this is how it looks, their variables are a1, a2, a3, a4 and a5.
This is their data. a1= 4.2 (3.8 to 4.5),
a2= 3.7(3.3 to 4.0),
a3= 2.4(2.3 to 2.5)
a4= 1.9(1.8 to 2.0)
a5= 1.5(1.4 to 1.6).
Their absolute change was -2.7 (-3.0 to -2.4)
I would preciate any help that I can get!
