dessskris Posted December 10, 2011 Report Share Posted December 10, 2011 Thanks! I now realize exponential's not the best. So, I'm using cubic for my model. When they say "analytically develop one model function", can we use regression to find the equation or do we have to use matrices? If its matrices, I'm screwed because I don't understand it I can't stress this enough: ANALYTICALLY means ALGEBRAICALLY, WITHOUT TECHNOLOGY!!! so NO you can't simply use regression. Reply Link to post Share on other sites More sharing options...
HoolaBaloola Posted December 10, 2011 Report Share Posted December 10, 2011 When doing Quartic functions, remember to choose spread data! e.g dont pick x=0,5,10,20. Try to spread different values of x, thanks Desy for this tip! Reply Link to post Share on other sites More sharing options...
Wishes Posted December 10, 2011 Report Share Posted December 10, 2011 Hello to everybody! I am nearly finished with this one, only wondering whether it is better to include graphs that show grids or ones that do not. Does that makes any difference whatsoever? Which program did you use to make these graphs ? Reply Link to post Share on other sites More sharing options...
sk2801 Posted December 10, 2011 Report Share Posted December 10, 2011 Hey everyone, when it says "what types of functions could model the behaviour of the graph" how many different types of functions should i show? also, can i still use logistic as one model function even though it's given later in the assignment? i'd appreciate any help or advice on this thank youuuuuu! Reply Link to post Share on other sites More sharing options...
sk2801 Posted December 10, 2011 Report Share Posted December 10, 2011 how do i graph the logistic function on excel??!?!?!?!?!if not, are there any other graphing softwares i can use ?????????someone reply asap! please! Reply Link to post Share on other sites More sharing options...
Sabs44 Posted December 10, 2011 Report Share Posted December 10, 2011 Hey everyone, when it says "what types of functions could model the behaviour of the graph" how many different types of functions should i show? also, can i still use logistic as one model function even though it's given later in the assignment? i'd appreciate any help or advice on this thank youuuuuu! You just need to name a couple, and give reasons why they would work. And no, you can't use logistic, that's for the later bit how do i graph the logistic function on excel??!?!?!?!?! if not, are there any other graphing softwares i can use ????????? someone reply asap! please! You can't graph it on Excel sadly... but try GeoGebra, it works great! Reply Link to post Share on other sites More sharing options...
sk2801 Posted December 10, 2011 Report Share Posted December 10, 2011 (edited) Hey everyone, when it says "what types of functions could model the behaviour of the graph" how many different types of functions should i show? also, can i still use logistic as one model function even though it's given later in the assignment? i'd appreciate any help or advice on this thank youuuuuu! You just need to name a couple, and give reasons why they would work. And no, you can't use logistic, that's for the later bit how do i graph the logistic function on excel??!?!?!?!?! if not, are there any other graphing softwares i can use ????????? someone reply asap! please! You can't graph it on Excel sadly... but try GeoGebra, it works great! for the graphs, can i name cubic and quartic, and describe the pros and cons? also, i was planning to do exponential and logistic. if i cant include logistic anymore, should i just stop with exponential and keep that as my main graph? Also! cubic has a stronger r2 value than exponential. and i show this in my portfolio. if i were to use exponential as my model function, is it alright if the r2 value says its not as accurate? thanks once again Edited December 10, 2011 by sk2801 Reply Link to post Share on other sites More sharing options...
Wishes Posted December 10, 2011 Report Share Posted December 10, 2011 Desssyy!!!! I need your help! Ive tried doing a quartic function and all, double checked, done matrices and everything and its not looking like the graph its supposed to, it starts normal then it plummets up! and i get an equation that is totally wrong, what have i done wrong? Ive double checked EVERYTHING Did you find out how to fix the plummet??? I have the same problem (my equation works well for the first 8 points but then plummets down before the 9th point and 10th point, and i followed the guide precisely so I dont know what im doing wrong!!! If anyone could help me id be so grateful !!!!! Reply Link to post Share on other sites More sharing options...
Wishes Posted December 10, 2011 Report Share Posted December 10, 2011 Also, I tried the quartic but then it plummeted down before the 9th point, so i think im switching to exponential. Can someone give me some advice on hwo to start making the exponential equation? Reply Link to post Share on other sites More sharing options...
Sabs44 Posted December 10, 2011 Report Share Posted December 10, 2011 Hey everyone, when it says "what types of functions could model the behaviour of the graph" how many different types of functions should i show? also, can i still use logistic as one model function even though it's given later in the assignment? i'd appreciate any help or advice on this thank youuuuuu! You just need to name a couple, and give reasons why they would work. And no, you can't use logistic, that's for the later bit how do i graph the logistic function on excel??!?!?!?!?! if not, are there any other graphing softwares i can use ????????? someone reply asap! please! You can't graph it on Excel sadly... but try GeoGebra, it works great! for the graphs, can i name cubic and quartic, and describe the pros and cons? also, i was planning to do exponential and logistic. if i cant include logistic anymore, should i just stop with exponential and keep that as my main graph? thanks once again Yeah you can name them, and talk about why you think they would model the data well (like how it curves like an S shape, similar to cubics). The thing is... exponential really isn't very good at all. Have you tried graphing exponential and different polynomials? When I did this, cubic and quartic and higher degree polynomials were much better fits for the data, so I wouldn't use exponential as your "main graph". Good luck! Reply Link to post Share on other sites More sharing options...
Wishes Posted December 10, 2011 Report Share Posted December 10, 2011 Also, I tried the quartic but then it plummeted down before the 9th point, so i think im switching to exponential. Can someone give me some advice on hwo to start making the exponential equation?Or logarithmic, either, it doesnt matter Reply Link to post Share on other sites More sharing options...
Wishes Posted December 10, 2011 Report Share Posted December 10, 2011 Hey everyone, when it says "what types of functions could model the behaviour of the graph" how many different types of functions should i show? also, can i still use logistic as one model function even though it's given later in the assignment? i'd appreciate any help or advice on this thank youuuuuu! You just need to name a couple, and give reasons why they would work. And no, you can't use logistic, that's for the later bit how do i graph the logistic function on excel??!?!?!?!?! if not, are there any other graphing softwares i can use ????????? someone reply asap! please! You can't graph it on Excel sadly... but try GeoGebra, it works great! for the graphs, can i name cubic and quartic, and describe the pros and cons? also, i was planning to do exponential and logistic. if i cant include logistic anymore, should i just stop with exponential and keep that as my main graph? thanks once again Yeah you can name them, and talk about why you think they would model the data well (like how it curves like an S shape, similar to cubics). The thing is... exponential really isn't very good at all. Have you tried graphing exponential and different polynomials? When I did this, cubic and quartic and higher degree polynomials were much better fits for the data, so I wouldn't use exponential as your "main graph". Good luck! I tried to use quartic and cubic as well, but they plummeted down before the 9th and 10th point. Did you use the matrices to find your equations or some other method? Reply Link to post Share on other sites More sharing options...
sk2801 Posted December 10, 2011 Report Share Posted December 10, 2011 Hey everyone, when it says "what types of functions could model the behaviour of the graph" how many different types of functions should i show? also, can i still use logistic as one model function even though it's given later in the assignment? i'd appreciate any help or advice on this thank youuuuuu! You just need to name a couple, and give reasons why they would work. And no, you can't use logistic, that's for the later bit how do i graph the logistic function on excel??!?!?!?!?! if not, are there any other graphing softwares i can use ????????? someone reply asap! please! You can't graph it on Excel sadly... but try GeoGebra, it works great! for the graphs, can i name cubic and quartic, and describe the pros and cons? also, i was planning to do exponential and logistic. if i cant include logistic anymore, should i just stop with exponential and keep that as my main graph? thanks once again Yeah you can name them, and talk about why you think they would model the data well (like how it curves like an S shape, similar to cubics). The thing is... exponential really isn't very good at all. Have you tried graphing exponential and different polynomials? When I did this, cubic and quartic and higher degree polynomials were much better fits for the data, so I wouldn't use exponential as your "main graph". Good luck! Thank you soooooooo much! i appreciate the help Reply Link to post Share on other sites More sharing options...
sk2801 Posted December 10, 2011 Report Share Posted December 10, 2011 Hey everyone, when it says "what types of functions could model the behaviour of the graph" how many different types of functions should i show? also, can i still use logistic as one model function even though it's given later in the assignment? i'd appreciate any help or advice on this thank youuuuuu! You just need to name a couple, and give reasons why they would work. And no, you can't use logistic, that's for the later bit how do i graph the logistic function on excel??!?!?!?!?! if not, are there any other graphing softwares i can use ????????? someone reply asap! please! You can't graph it on Excel sadly... but try GeoGebra, it works great! for the graphs, can i name cubic and quartic, and describe the pros and cons? also, i was planning to do exponential and logistic. if i cant include logistic anymore, should i just stop with exponential and keep that as my main graph? thanks once again Yeah you can name them, and talk about why you think they would model the data well (like how it curves like an S shape, similar to cubics). The thing is... exponential really isn't very good at all. Have you tried graphing exponential and different polynomials? When I did this, cubic and quartic and higher degree polynomials were much better fits for the data, so I wouldn't use exponential as your "main graph". Good luck! I tried to use quartic and cubic as well, but they plummeted down before the 9th and 10th point. Did you use the matrices to find your equations or some other method? i used regression to find my equations...............thats why i think cubic might not be the best fit, and exponential might be better im not quite sure anymore.. Reply Link to post Share on other sites More sharing options...
sk2801 Posted December 10, 2011 Report Share Posted December 10, 2011 Hey everyone, when it says "what types of functions could model the behaviour of the graph" how many different types of functions should i show? also, can i still use logistic as one model function even though it's given later in the assignment? i'd appreciate any help or advice on this thank youuuuuu! You just need to name a couple, and give reasons why they would work. And no, you can't use logistic, that's for the later bit how do i graph the logistic function on excel??!?!?!?!?! if not, are there any other graphing softwares i can use ????????? someone reply asap! please! You can't graph it on Excel sadly... but try GeoGebra, it works great! for the graphs, can i name cubic and quartic, and describe the pros and cons? also, i was planning to do exponential and logistic. if i cant include logistic anymore, should i just stop with exponential and keep that as my main graph? thanks once again Yeah you can name them, and talk about why you think they would model the data well (like how it curves like an S shape, similar to cubics). The thing is... exponential really isn't very good at all. Have you tried graphing exponential and different polynomials? When I did this, cubic and quartic and higher degree polynomials were much better fits for the data, so I wouldn't use exponential as your "main graph". Good luck! I tried to use quartic and cubic as well, but they plummeted down before the 9th and 10th point. Did you use the matrices to find your equations or some other method? i used regression to find my equations...............thats why i think cubic might not be the best fit, and exponential might be better im not quite sure anymore.. what do u mean by plummeted? did you substitute the points back into the equation to double check? Reply Link to post Share on other sites More sharing options...
tbhizzle Posted December 10, 2011 Report Share Posted December 10, 2011 Can someone help with "what types of functions could model the behavior of the graph?" i find it hard to find a equation that wouldnt be possible to fit this model Reply Link to post Share on other sites More sharing options...
sk2801 Posted December 10, 2011 Report Share Posted December 10, 2011 Can someone help with "what types of functions could model the behavior of the graph?" i find it hard to find a equation that wouldnt be possible to fit this model think about whats best for population. Maybe, not all the functions you are thinking of, is viable for population growth. hope that helps Reply Link to post Share on other sites More sharing options...
sk2801 Posted December 10, 2011 Report Share Posted December 10, 2011 how do i graph a logistic function on geogebra i'd appreciate anyone who can get back asap!! thanks Reply Link to post Share on other sites More sharing options...
1995 Posted December 10, 2011 Report Share Posted December 10, 2011 does anyone know how to edit the axises on geogebra? as in so its not increasing from 0-10-20 or anything steadily on a scale but more like it jumps straight to 0 to 1950, 1955, 1960?I really need the y axis to be on the graph too, but if it increases on a scale, it definitly wont be in the screen shot.also, whats the best software for graphing for this assignment? geogebra seems so complicated ! would appreciate any reply ! Reply Link to post Share on other sites More sharing options...
1995 Posted December 11, 2011 Report Share Posted December 11, 2011 how do i graph a logistic function on geogebra i'd appreciate anyone who can get back asap!! thanks SK!! its your azn buddy...hahah did you put it in the input box below? Reply Link to post Share on other sites More sharing options...
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