El Che Posted February 12, 2012 Report Share Posted February 12, 2012 You should have an USB cable (it should be provided to you by your school or when you purchase the calculator) and TI Connect software. Once you have those two you can take screenshots of your GDC and put them into your task. Reply Link to post Share on other sites More sharing options...
Janus Antonio Agbing Posted February 16, 2012 Report Share Posted February 16, 2012 are we to keep the sig figs of the model to 3? Reply Link to post Share on other sites More sharing options...
nb94 Posted February 22, 2012 Report Share Posted February 22, 2012 (edited) Of course I did evaluate the logistic curve as well as my other options. But does the portfolio mandate that I prove that the logistic curve is the best for this set of data, or can I argue that another is better?The reason I ask is because I am also evaluating another curve which fits more closely to the points. And the curve gradually flattens after the data just like the logistic one does. The only negative is that the curve before the data set decreases to reach a minimum point then increases to fit the data points (I'm not sure if that's clear, hope it made sense)Can I argue for it because it better fits the points, or does the portfolio want us to prove that the logistic specifically is best?EDIT: Or maybe I just shouldn't risk it and stick with logistic, yes? :/ Edited February 22, 2012 by nb94 Reply Link to post Share on other sites More sharing options...
Stanislaw Posted February 22, 2012 Report Share Posted February 22, 2012 well... does your population start at an infinite point?No.Use the function that most accurately represents your data set : population. Population should start near 0, and rise gradually.Prove whichever function you wish to use is the best. You're allowed to use another function, but you must use the best function. Reply Link to post Share on other sites More sharing options...
Summer Glau Posted February 22, 2012 Report Share Posted February 22, 2012 Just use the logistic function. It's the one they tell you to use; just go with it and make your life easier. Reply Link to post Share on other sites More sharing options...
Ghada Alkhalaf Posted February 22, 2012 Report Share Posted February 22, 2012 hey all, i desperately need some help :"( i'm stuck Reply Link to post Share on other sites More sharing options...
Summer Glau Posted February 22, 2012 Report Share Posted February 22, 2012 hey all, i desperately need some help :"( i'm stuck We can't help you if you don't tell us what exactly you need help with Reply Link to post Share on other sites More sharing options...
eseb Posted February 23, 2012 Report Share Posted February 23, 2012 When we are analytically developing a model function, and for example we chose to develop it using matrices...can we use row and reduction on the calculator? Reply Link to post Share on other sites More sharing options...
eseb Posted February 23, 2012 Report Share Posted February 23, 2012 Just use the logistic function. It's the one they tell you to use; just go with it and make your life easier.no you cannot analytically develop a logistic model, if that is what you mean... Reply Link to post Share on other sites More sharing options...
privacypleasenig Posted February 23, 2012 Report Share Posted February 23, 2012 I can do everything except find the parameters, but i got somewhat close with K=2(midpoint of population in millions, L=10^(range of population-range of years), and M=K/(range of population-range of years). how do I get better values for the parameters? Reply Link to post Share on other sites More sharing options...
privacypleasenig Posted February 23, 2012 Report Share Posted February 23, 2012 hello, how do you get the parameters of K, L , M. I looked at the pdf posted on the first page but I am still confused o how to get the Parameters.. can someone please help me? p.s What is regression?? Hey. If you have a GDC like TI-83 or TI-84 this should be easy. Go to STATS then then click on edit and enter all the data that was given. The years are too large and makes it harder to graph so you can input 0,5,10,15,20,25,30,35,40,45. These are the exact intervals as the years so the accuracy is fine. After you enter both the year and population value quit and then go back to STATS. Go across to CALC then scroll down all the way to logistic...which is B I believe then press enter then put L1 and L2. Then waalaa you have your parameters. woah... you are awesome. thank you so much. should i refer to the logistic function on the calculator to describe how i used technology to estimate the parameters? Reply Link to post Share on other sites More sharing options...
HrtlssShn Posted February 23, 2012 Report Share Posted February 23, 2012 hello, how do you get the parameters of K, L , M. I looked at the pdf posted on the first page but I am still confused o how to get the Parameters.. can someone please help me? p.s What is regression?? Hey. If you have a GDC like TI-83 or TI-84 this should be easy. Go to STATS then then click on edit and enter all the data that was given. The years are too large and makes it harder to graph so you can input 0,5,10,15,20,25,30,35,40,45. These are the exact intervals as the years so the accuracy is fine. After you enter both the year and population value quit and then go back to STATS. Go across to CALC then scroll down all the way to logistic...which is B I believe then press enter then put L1 and L2. Then waalaa you have your parameters. woah... you are awesome. thank you so much. should i refer to the logistic function on the calculator to describe how i used technology to estimate the parameters? Awww thanks lol. I try to help. Umm I guess you could use that to describe technology. I'd probably ask the teacher just for verification though. Good luck with the paper Reply Link to post Share on other sites More sharing options...
Ghada Alkhalaf Posted February 23, 2012 Report Share Posted February 23, 2012 i'm stuck with the researchers part, i don't really know how to start doing it Reply Link to post Share on other sites More sharing options...
jfraczek Posted February 28, 2012 Report Share Posted February 28, 2012 guys do u think it makes sense to include standard deviation to show the linearity of unprocessed data? Reply Link to post Share on other sites More sharing options...
laurabean26 Posted March 1, 2012 Report Share Posted March 1, 2012 i'm attempting to do this today, and have just started. With plotting the points, I found a cubic fit the best (out of what the graphing techn. gave me automatically...) but to find it do I have to use matrices? And If doing so, should I do it through the ninth power? And also, when doing that... should I use the year as the number? ... 1950 or should I value it as 1, 2, 3... etc.Any advice would be really helpful! Reply Link to post Share on other sites More sharing options...
Guest hiddenninja Posted March 4, 2012 Report Share Posted March 4, 2012 At the end of the IA, they ask us "how well each of the models above fit the IMF data", does this include the researcher's model? or is it only the models that we created? Reply Link to post Share on other sites More sharing options...
parkseunghyun Posted March 5, 2012 Report Share Posted March 5, 2012 hi, i am stuck on the question that asks about the researchers model. i have defined the variables, but now i'm not sure how to go about constructing their model if i am using excel? can someone please help me thanks Reply Link to post Share on other sites More sharing options...
nreyes94 Posted March 8, 2012 Report Share Posted March 8, 2012 Im kinda confused, in the first question they ask define the pertinent variables and parameters, what exactly are they refering to? Reply Link to post Share on other sites More sharing options...
ayeyoubby Posted March 11, 2012 Report Share Posted March 11, 2012 hey guys, I was wonder if you have to algebraically show how you found your K L and M, im afraid that i would get marks docked off if I dont..thanks! Reply Link to post Share on other sites More sharing options...
Belumimael Posted March 11, 2012 Report Share Posted March 11, 2012 WHAT ARE THE VARIABLES AND THE PARAMETERS? IF ANYONE CAN HELP, I WILL APPRECIATE YOUR TIME. Reply Link to post Share on other sites More sharing options...
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