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st: RE: From: ipianah nic <ipianahnic@gmail.com>


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: From: ipianah nic <ipianahnic@gmail.com>
Date   Fri, 11 Feb 2011 11:27:08 +0000

You decide whether it is more appropriate to use -nl-, -regress- after transformations, or -glm- with a log link. That's (at least) three to choose from. There is no answer free of assumptions about the most likely kind of error term. 

Also, if this is student homework, you got more help than you deserved. Real data that people care about don't arrive as Y and X. 

Nick 
n.j.cox@durham.ac.uk 

ipianah nic <ipianahnic@gmail.com>

how do I fit an exponential regression curve and extrapolate the data
using sample data below;

X	 Y
1	2020
2	1747
3	1667
4	1608
5	1578
6	1552
7	1540
8	1526
9	1494
10	1484
11	1476
12	1460
13	1455
14	1449
15	1442
16	1426
17	1418
18	1412
19	1390
20	1389
21	1384
22	1380
23	1380
24	1365


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