2013-12-04, 09:03 | Link #7261 | |
Senior Member
Join Date: Jun 2007
Location: 28° 37', North ; 77° 13', East
Age: 33
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2013-12-04, 10:46 | Link #7262 | |
18782+18782=37564
Join Date: Sep 2010
Location: InterWebs
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You're lucky to have a good circle of friends so as to have not encountered people like these.
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2013-12-04, 10:51 | Link #7263 | |
今宵の虎徹は血に飢えている
Join Date: Jan 2009
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2013-12-12, 10:07 | Link #7270 |
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Join Date: Nov 2006
Location: Australia
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I want to ask a little bit technical question.
For example i have a really complicated equation, but just for easy understand, let's just say: y= ax^(b)+c Then we also have, for example, If x = 1, y =~235 x = 2, y = ~342 x = 3, y = ~ 416 (the "~' is roughly) .............. Then how can we find what is a, b, and c? I means i heard that you need to use SPSS program to analyse this. But i don't know what is this kind of problem called, so can't google for it
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2013-12-12, 10:30 | Link #7271 |
temporary safeguard
Join Date: May 2004
Location: Germany
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You know (roughly) the curve and are trying to find a forumula that will produce the curve using a computer program?
'approximation', maybe? The program will start with some base curve and alter it in little steps, each step making it look more like your target curve. When it's 'close enough' you will have a formula that 'roughly' describes your curve. |
2013-12-12, 10:58 | Link #7272 | |
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Join Date: Nov 2006
Location: Australia
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Is "approximation" the name of the program in SPSS? If that's the case, i will try to google on it later
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2013-12-12, 11:14 | Link #7273 |
temporary safeguard
Join Date: May 2004
Location: Germany
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No, approximation is the name of the mathematic method which does something like that.
I'm not a native speaker, so such technical names can be misleading, but my translation tool gives me 'approximation polynomial' for the thing I am thinking of. |
2013-12-12, 16:14 | Link #7274 |
18782+18782=37564
Join Date: Sep 2010
Location: InterWebs
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You can find simple curve approximation with Excel up to 6th order polynomial and several others. Build two columns of data (x and y), plot the curve with a chart, add the trendline, and display the equation.
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2013-12-12, 16:17 | Link #7275 | |
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Join Date: Nov 2006
Location: Australia
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I will try to google a bit more on it later when i have time. Thank, at least i have a lead now Tried with Excel but can't quite get what i want. I think because part of the equation have something like ax + b^(cx), which kinda make it harder for the trend-line to detect
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2013-12-17, 02:51 | Link #7278 | |
a.k.a. Flammenkrieg
IT Support
Join Date: Apr 2009
Location: Down under...
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2013-12-17, 05:15 | Link #7280 |
Senior Member
Join Date: Jan 2009
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You could also use PDFCreator, which let's you crate a pdf by printing it.
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problem, q&a, serious |
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