afitz Posted October 24, 2008 Report Share Posted October 24, 2008 Ok...so this project isn't too bad. The only thing many classmates and I are stuck on is where we have to find the BMI data from another country. Anybody have any success with this? Any help would be really appreciated.*The other two thread for the BMI project were merged with this one* Reply Link to post Share on other sites More sharing options...
Guest syrianstar Posted October 24, 2008 Report Share Posted October 24, 2008 (edited) I only completed my Maths BMI Portfolio this week The first time I read over the questions I assumed that the research question would be the easiest, but lo and behold since when was anything related to IB easy? They even managed to make research difficult! I was able to find some data on school girls in Australia, but for a very limited age range. Unfortunantly by the time I actually found data that would be good enough, the deadline passed and our Maths Portfolios were submitted and locked up in a dark drawer I still can't believe that I missed it Click here Edited October 24, 2008 by syrianstar 1 Reply Link to post Share on other sites More sharing options...
Jernej Posted October 26, 2008 Report Share Posted October 26, 2008 I found data for Guatemalan kids: http://www.unu.edu/unupress/food2/uid02e/uid02e0e.htmBetter than nothing - we also had to hand in completed portofolios two weeks ago ... Reply Link to post Share on other sites More sharing options...
eduardo1 Posted October 26, 2008 Report Share Posted October 26, 2008 heyy everyone !!! I need help with my BMI portfolio !!! I've a couple of questions about some of the steps in it plz ! if someone has already done it.. give me your e-mail adress to chat a lil' bit !! thank you all =) Reply Link to post Share on other sites More sharing options...
Jernej Posted October 26, 2008 Report Share Posted October 26, 2008 http://www.ibsurvival.com/forum/index.php?showtopic=4059 Reply Link to post Share on other sites More sharing options...
afitz Posted November 1, 2008 Author Report Share Posted November 1, 2008 ive heard people say the american female bmi data is quadratic..natural logarithm..quartic..AHHH! Does anybody know for sure or have any idea? Reply Link to post Share on other sites More sharing options...
Jernej Posted November 1, 2008 Report Share Posted November 1, 2008 It's polynomial of 3rd degree or higher. Should you choose this option, I've posted the instructions on how to obtain polynomial of any degree (up to maximum number of points in your set of data, to be precise) here. You will find data for median BMI of females here. Another option is to mess around with the sine or cosine function. I can also assist you with this one if you like, but I'd go for polynomials if I were you. 1 Reply Link to post Share on other sites More sharing options...
nanyen1991 Posted November 13, 2008 Report Share Posted November 13, 2008 (edited) http://www.ijbs.org/User/ContentFullText.a...57&Type=pdfThis gives the BMI of children in Shaanxi, China(Scroll down to page 7) Edited November 13, 2008 by nanyen1991 1 Reply Link to post Share on other sites More sharing options...
AbigaleNunevHoltze Posted November 18, 2008 Report Share Posted November 18, 2008 Hello all I seem to be having the worst time trying to find an age-vs-BMI index for women in countries that are NOT a part of the commonwealth.All that I have googled thus far has lead me, in some way or another, to the same World Health Organization site. Which is driving me CRAZY!Any links would be appreciated Reply Link to post Share on other sites More sharing options...
Rawrn3ss Posted November 18, 2008 Report Share Posted November 18, 2008 The third question states:Use technology to find another function that models the data.I am absolutely baffled by this question because the previous one before it pretty much states the exact same thing.Is the question asking for another equation or a whole different type of function because the only type of function that I can find that fits is a polynomial.Does it have something to do with the order? Reply Link to post Share on other sites More sharing options...
robertomx Posted November 23, 2008 Report Share Posted November 23, 2008 It's asking for another equation; that is, use technology to find a function like the one you propose (a polynomial in this case) but that fits the information better. Reply Link to post Share on other sites More sharing options...
IBSQUARED Posted November 23, 2008 Report Share Posted November 23, 2008 Yeah exactly what Robertomx said. You could either use Graphmatica's function (its a free software you can download), or use a sine regression.And #2 differs from #3 because #2 asks you to derive the function manually whereas #3 is asking for the technological function, you dont have to show your calculations etc in this part. Reply Link to post Share on other sites More sharing options...
fastlight Posted November 30, 2008 Report Share Posted November 30, 2008 It asks you to find the common differences between the graphs as well..i dont get that question lol!also is the quadratic equation sufficient enough to find the BMI at age 30...cuz that the only graph that goes up like that....except for the linear function...im confused T_T....cuz i dont get technology even got those numbers ....i gotta hand it in tomorrow hehe Reply Link to post Share on other sites More sharing options...
fastlight Posted November 30, 2008 Report Share Posted November 30, 2008 im really stuck with the whole internal assesment hahacan someone maybe help me ? i still dont get wat a parameter is and i dont get which functions to use and i dont get how to mention common differences in the graphs lolll. Reply Link to post Share on other sites More sharing options...
Chantel Posted December 17, 2008 Report Share Posted December 17, 2008 It asks you to find the common differences between the graphs as well..i dont get that question lol!also is the quadratic equation sufficient enough to find the BMI at age 30...cuz that the only graph that goes up like that....except for the linear function...im confused T_T....cuz i dont get technology even got those numbers ....i gotta hand it in tomorrow heheHey,If you go to Vernier.com and download "Graphical Analysis 3.4 demo" it helps sooo much for this portfolio!! It does the whole technology thing all by its self, like it finds the function that models it and everything.. this thing saved my mathematical life Reply Link to post Share on other sites More sharing options...
Chantel Posted December 17, 2008 Report Share Posted December 17, 2008 Hello all I seem to be having the worst time trying to find an age-vs-BMI index for women in countries that are NOT a part of the commonwealth.All that I have googled thus far has lead me, in some way or another, to the same World Health Organization site. Which is driving me CRAZY!Any links would be appreciated www.halls.md/bmi/lasting.htm (UK women) Reply Link to post Share on other sites More sharing options...
Britt Posted December 17, 2008 Report Share Posted December 17, 2008 Ha, so I am pretty sure I know you Chantel. Anyways. So I understand this portfolio pretty well, but I am soooo confused on how to find the BMI of the 30 year old. All my graphs go down, and the one that goes up again does it after ... If that makes sense. I used the technology equation for a polynomial to the 5th power which was the only one that did not slope way down off the graph to find the 30 year old. Is this one right? I drops down to about 20 which does not really make sense on what the actual BMI of a 30 year old should be. (On all the websites I went to they said about 26, or 25ish.) So yeah ... anyone care to help me on this? Reply Link to post Share on other sites More sharing options...
[m a a r i.] Posted January 22, 2009 Report Share Posted January 22, 2009 who's doing this math portfolio, i am??anyone having difficulties?? Reply Link to post Share on other sites More sharing options...
ibstudent11 Posted January 27, 2009 Report Share Posted January 27, 2009 Okay so we are working on BMI data. We have to find a function that fits the data and models the behavior of the graph. It looks like it could be a cubic function, but which one should I use? y=ax^3+bx^2+cx+d or y= a (x+1)(x)(x+5)+d ??? The first one is the most basic form, but is also harder to explain when you are doing translations and whatnot. The second one is much easier to explain, but what is that equation called? Also what is it in it's "variable form", with all the a, b, c, etc.? Another problem with the second one, is how do I show that I got there? It's not the most obvious equation.Please help! Please!! Also many thanks in advance! Reply Link to post Share on other sites More sharing options...
supbhang Posted February 5, 2009 Report Share Posted February 5, 2009 Well, I used the first one. I picked 4 values and thus I had 4 variables and 4 equations. I solved them and I got my new equation. Where is your problem explaining the step? Well, I've got another question. The portfolio asks in the end"Use the Internet to find BMI data for females from another country. Does your model fit this data? If not, what changes would you need to make? Discuss any limitations to your model."Does anyone know where I can find BMI data? I couldn't find any so far..... Reply Link to post Share on other sites More sharing options...
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