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2008 Dec 06
0
Inversing a non-monotonic spline
I have developed a GAM model in order to predict Y using 4 X variables.  2 of these X's are factors, and 1 is a spline.
Part of the data looks like:
Days	WRM	variety	PWM	O_EC
31	75	1	90	234
31	79	1	78	283
31	82	1	92	281
31	84	1	96	213
31	99	2	69	247
31	100	2	77	324
31	104	2	74	259
31	118	2	81	282
31	61	3	58	478
31	98	3	83	429
31	98	3	70	379
31	156	3	87	467
31	78	4	56	283
31	97	4	67	282
31	106	4	69	368
31	184	4	78	386
39	66	1	204	233
39	83	1	265	360
39	87	1	270	308
39	23...