nonlinear piecewise regression

[esraa1]

Hi! I have the data below and I was applied the linear regression (piecewise regression), I wonder if I can apply the piecewise nonlinear regression by SAS.

30 1 
26 2
39 3 
44 4 
35 5     
20 6 
27 7 
67 8 
25 9 
39 10 
69 11   
74 12 
45 13 
41 14 
50 15 
67 16 
55 17   
77 18 
41 19 
38 20
38 21 
46 22 
45 23   
62 24  
60 25  
62 26 
49 27 
60 28
78 29         
69 30      
64 31 
86 32
68 33 
53 34 
59 35 
56 36 
68 37 
57 38 
59 39 
101 40 
63 41
90 42 
92 43 
64 44      
77 45 
69 46
82 47 
70 48 
63 49 
66 50  
78 51 
94 52 
88 53 
62 54 
77 55 
92 56 
76 57 
55 58 
70 59 
54 60 
76 61 
58 62 
58 63
79 64 
77 65 
79 66 

[PaigeMiller]

Example:

https://documentation.sas.com/?docsetId=statug&docsetTarget=statug_nlin_examples01.htm&docsetVersion...

[Ksharp]

It looks like you need Forecast Model (SAS/ETS) .
Try post it at Forecast Forum .

Or @Rick_SAS  may have some thought .

[Rick_SAS]

This is a continuation of a previous thread, but this time the OP is asking for nonlinear regression.

You say "nonlinear regression," but I suspect you mean either polynomial regression (fit a quadratic or cubic curve) or nonparametric regression (fit a smooth curve). Both can be accomplished using the same tip you got earlier: In PROC SGPLOT 

• use the REG statement and the DEGREE=3 option to fit a cubic polynomial to the data.
• use the LOESS statement to fit a smooth curve to the data.

Here is a link to the SGPLOT documentation about fitting curves in PROC SGPLOT