macrofire Posted February 27, 2013 Report Share Posted February 27, 2013 I figured out how to analytically create an equation for a logistic function. That took a while. Reply Link to post Share on other sites More sharing options...
Rahul Posted February 28, 2013 Report Share Posted February 28, 2013 @Macrofire - How on earth did you do that? Help an inexperienced guy out here! Hahahah. I don't even have this portfolio, just interested!Ontopic:Like I've explained, you can back-substitute into a system. For an equation of degree 3, lets say, which has points which lie on it that are (e,f)(g,h)(i,j)(k,l):The system that defines the values for the coefficients is linear. As follows:f=ae^3+be^2+ce+dand so on, using respective pairs. Then you can solve the four equations for the four coeffficient variables a b c and d as you already know e and f. See my previous post for more detail - Desy I believe also ahs one earlier in this thread. Reply Link to post Share on other sites More sharing options...
Eoan Posted March 15, 2013 Report Share Posted March 15, 2013 Err general question. This site,http://www.cs.xu.edu/math/math120/01f/logistic.pdf, has the equations for solving a logistical equation analytically but in the context of a different data set. Would it be plagiarism to use the equation in the link to help with our IA even if we explain the steps? e.g. there is an equation for finding a paramter derived from using the inflection point which ofc could be derived without the link but it would look very similar to that in the link. 1 Reply Link to post Share on other sites More sharing options...
jgeorge095 Posted March 18, 2013 Report Share Posted March 18, 2013 (edited) Guys, it doesn´t really matter what kind of equation you get for the first questions, because you are going to change it for the very last question, just because this tasks are supposed to be a learning process, so for the first question where they ask you to create an equation, you should try a linear regression, which can be easily done, like in this document http://www.ibsurvival.com/files/file/2640-linear-regression/.This is also an analytic method, so is permitted to use it. Then, in the questions that come after this, you can use any other graphing method to obtain another equation, with the purpose of getting you to critizise tour own works, an in the last question, you should think if your equation is really far from the new data given, and may have to get a new equation, which is really easy. The hard part is to explain everything Edited March 18, 2013 by jgeorge095 Reply Link to post Share on other sites More sharing options...
BallislifeJP Posted March 19, 2013 Report Share Posted March 19, 2013 OK so I'm currently working on the gold medal portfolio, and apparently some of the data I got for this particular portfolio is wrong: the 1896 height is listed as 190cm when actually it was 181cm and the 1900 high jump, which isn't listed, was the one where the winning height was 190cm. Also, the height for the 1924 Olympics isn't listed even though the assignment sheet I got says the table gives the results from ALL the Olympic events since 1896. I was just wondering if anyone else noticed this, and what they did about it. Should I mention that and use the real results or just go with what I'm given? Reply Link to post Share on other sites More sharing options...
mmagnin Posted April 27, 2013 Report Share Posted April 27, 2013 ......Can somebody please help me. I'm supposed to use the correlation coefficient in order to prove how well my model fits, which worked for the linear function. I now have to do it with a non-linear function - a logistic one. Does anyone know how to do this? please Reply Link to post Share on other sites More sharing options...
dgmanchia Posted August 18, 2013 Report Share Posted August 18, 2013 Hey guys! The task says "Discuss the overall trend from 1896 to 2008, with specific references to significant fluctuations"What does specific references to significant fluctuations mean?Thank you! Reply Link to post Share on other sites More sharing options...
khimberleigh Posted August 18, 2013 Report Share Posted August 18, 2013 It means areas when a data point (or points) is different to the general trend. For example, the height might decrease by a lot suddenly. (hint hint)Also, does anyone know how to make a graph with a hybrid function on Excel? Reply Link to post Share on other sites More sharing options...
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