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Wanted: statistician to solve a curve-fitting problem

Skymouse is off-lineGold Member
04 March 2013 09:15
skymouse
Photographer
skymouse
Location
United Kingdom
London
London

This is a long shot ...

Can any of you guys or gals solve a curve-filtting problem for me?

Without going into numbers here, I have twelve data points. Also, I know the mean of data points 13 to 24, and I kow the mean of data points 25 to 36. The only constraints are that the curve is monotonically descreasing, is always greater than or equal to zero, and is hypothesised to be asymptotic to some (unknown) non-zero value.

I'd like a reasonable fit, doesn't have to be amazingly close.
"Those are my principles, and if you don't like them... well, I have others." - Groucho Marx.


gerryquiff is off-lineSilver Member
04 March 2013 14:48
gerryquiff
Photographer
gerryquiff
Location
United Kingdom
Lanarkshire
Bonnie Scotland

Get into your local Grace Brothers department store, ask for Mrs Slocombe (Betty) she'll check your curves and sell you a girdle and bra to fit. cheeky
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Jim Gormley is off-line
04 March 2013 15:03
Truedefinition
Studio
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Truedefinition
Location
United Kingdom
Greater Manchester
Stockport

Does this qualify as the most difficult question ever asked on Purestorm ?
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Frank Sinnott is off-line
04 March 2013 15:19
frankpht
Photographer
frankpht
Location
United Kingdom
London


The answer and you're not going to like it is 42.


Paul Hodson is off-line
04 March 2013 15:28
mph
Photographer
mph
Location
United Kingdom
Cheshire
Crewe

Quote from Truedefinition
Does this qualify as the most difficult question ever asked on Purestorm ?



It would only be difficult if you understood it!

By God though - we are all impressed beyond words!  smiley

Amateur - happy to do TF with models with potential and enthusiasm. Website: www.mphodson.co.uk


04 March 2013 16:15
tomwhipp
Photographer


post the data points


Skymouse is off-lineGold Member
04 March 2013 18:51
skymouse
Photographer
skymouse
Location
United Kingdom
London
London

Quote from tomwhipp
post the data points



PM sent
"Those are my principles, and if you don't like them... well, I have others." - Groucho Marx.


04 March 2013 18:52
PaulManuell
Photographer


Quote from skymouse




Can any of you guys or gals solve a curve-fitting problem for me?










Yes, exercise more and/or eat less. Simples


UrbanFox is off-line
05 March 2013 11:10
MetropolitanFox
Photographer
This member has been suspended
MetropolitanFox
Location
United Kingdom
Kent
Maidstone

Stick it in excel and do a curve fit...

Tim


UrbanFox is off-line
05 March 2013 11:22
MetropolitanFox
Photographer
This member has been suspended
MetropolitanFox
Location
United Kingdom
Kent
Maidstone

Thinking about it, your mean values for points 13 to 24 and 25 to 36 are only any use if we know the sampling intervals

Tim



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