[R] R help

[Heh Ness]

I have a model like this (Nelson and Siegel 1987)

<img 
src="http://r.789695.n4.nabble.com/file/n4120161/31f188c684764cd431619dbb59fed5ae.png";
 border="0"/>

where tau and y are the maturities and yields, respectively, given to me in my 
data file..

y<-c(4.863,5.662,6.41,6.864,7.153,7.352,7.409,7.474,7.503,7.644,7.676,7.701,7.674,7.668,7.665,7.741,7.743,7.742)
tau<-c(1,3,6,9,12,15,18,21,24,30,36,48,60,72,84,96,108,120)

I firstly need to find the MLE of m which maximises the likelihood function and 
then I can easily find the b1, b2 and b3 constants using this m value via least 
squares estimation..

But does anybody know how I can go abouts finding the MLE of m and if you could 
help with providing r code for it, I would appreciate that a lot. I have been 
pulling my hair out for the past week now trying to do it :)

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