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oldpar
2011 Apr 13
0
ddply and nlminb
...n with the data grouped by Di using ddply
The first 5 steps appear to be working alright and produce reasonable
fit parameters and parameter errors.
However, when attempting to fit the function with the data grouped by Di
the parameters are returned with the same value for each grouping:
> R3Dpar
Di V1 V2
V3 V4 V5 V6
1 0.033461 0.06081973 -2.119109e-05 31.75188 -2.631321 17.32565 0.821518
2 0.082682 0.06081973 -2.119109e-05 31.75188 -2.631321 17.32565 0.821518
3 0.133670 0.06081973 -2.119109e-05 31.751...