Greetings R Help Group,
How does one effect a multiphasic logistic growth model with 4 phases (e.g.
Koops 1986; Weigel, Craig, Bidwell and Bates 1992; Grossman and Koops 2003)
with R.
Before writing to the group, the R help archives were searched, the web was
searched with Google, Venables and Ripley 2002 was consulted, Pinheiro and
Bates 2000 was consulted, Bates and Watts 2007 was bought and consulted, ETC.
but to no avail.
I have not written to any other group with respect to this problem.
The following data are offered as an example of the type of problem I am
dealing with and are average daily goat milk production in ml. for 14 weeks.
NoC is the goat number. PL1 is the production during the first week; PL2 is the
production during the second week, etc.
NoC PL1 PL2 PL3 PL4 PL5 PL6 PL7 PL8 PL9 PL10 PL11 PL12 PL13 PL14
52 490 950 800 900 850 850 750 610 640 900 980 890 890 910
48 970 1020 980 740 1050 970 850 790 900 920 1120 1120 1030 1300
54 1450 1420 1430 1120 1330 1230 1030 1170 1350 1530 1490 1500 1310 910
60 620 1250 1100 1150 780 930 990 940 760 730 790 1050 840 850
58 1370 1350 1200 1300 1350 1310 1070 910 1010 1300 1110 1070 990 660
42 1200 920 1150 850 720 630 630 710 850 810 930 980 820 1570
44 1200 1560 1650 1600 1450 1600 1160 1010 1440 1450 1530 1500 1550 850
47 1000 1100 1000 870 760 900 820 865 910 820 930 900 1130 1070
50 1300 1150 1200 1030 1070 970 860 900 950 1190 1250 1130 800 1400
56 950 1250 1200 1280 1220 1155 840 1016 1370 1220 1570 1520 1500 1150
1 870 1250 1160 1270 1200 1410 1110 1008 970 1130 1490 1330 1320 820
3 1000 1100 1200 1120 1250 980 750 890 1050 1160 1340 1210 1150 760
4 551 760 550 580 540 620 550 520 470 720 680 790 750 1230
5 810 1100 820 950 930 830 850 650 810 1070 1120 1300 1040 1320
6 800 1000 620 850 750 670 660 620 600 610 760 900 758 1070
7 720 830 1120 1050 820 820 850 810 800 750 780 940 1050 1310
8 950 1550 1560 1500 1230 1330 1150 1005 1020 1200 1440 1400 1290 1080
10 660 850 1100 980 1070 1100 870 790 880 950 1000 1210 1050 1220
It seems to me that it should be possible to effect the modeling process with
nlme. Any suggestions and or recommendations would be greatly appreciated.
Peter B.
Douglas M. Bates and Donald G. Watts. 2007. Nonlinear Regression Analysis and
Its Applications. Wiley Series in Probability and Statistics. John Wiley &
Sons, Inc., New York, NY, USA.
M. Grossman and W.J. Koops. 2003. Modeling Extended Lactation Curves of Dairy
Cattle: A Biological Basis for the Multiphasic Approach. J. Dairy Sci.
86:988-998.
W. J. Koops. 1986. Multiphasic Growth Curve Analysis. Growth 50:169-177.
Jose C. Pinheiro and Douglas M. Bates 2000. Mixed-Effects Models in S and
S-Plus. Statistics and Computing. Springer-Verlag New York, New York, NY, USA.
W. H. Venables and B. D. Ripley. 2002. Modern Applied Statistics with S. Fourth
edition. Statistics and Computing. Springer-Verlag New York, Inc., New York,
NY, USA.
K. A. Weigel, B. A. Craig, T. R. Bidwell and D. M. Bates. 1992. Comparison of
Alternative Diphasic Lactation Curve Models under Bovine Somatotropin
Administration. J. Dairy Sci. 75:580-589.
Peter B. Mandeville cel: 444 860 3204 tel: 52 444 826 2346-49 ext 532
fax: 52 444 826 2352 P.D. Favor de confirmar la llegada de este correo. Gracias.
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