# DKMikey

Members

12

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## Profile Information

• Gender
Male
• Exams
May 2012
• Country
United States
1. ## IA Type II -- Population Trends in China

Basically, all I did was subtract like 0.0000004 from the g term. Not sure if that's substantial enough though. Edit: Also, according to our teacher trying a new function is bad, bad, bad.
2. ## IA Type II -- Population Trends in China

How did you "revise" your model? I'm trying different things, but in the end I'm only getting worse off than what I first started with.
3. ## What are some of your biggest motivations in IB?

I just enjoy being busy...I feel horrible when I'm unproductive. And no, I did not expect to be only having about 5 hours of sleep each night, but it's better than doing nothing all day.
4. ## IA Type II -- Population Trends in China

what do you mean? the researcher's model part is indeed easy, just plot the data in yout GDC and generate the logistic regression that's it. Yep, that's what I did. I was just confused because when I read those 37 pages of lots of information, many people on the forums were saying that the researcher's model matched exactly with the data points of the graph, so I felt like I was doing it wrong. I'm probably just overthinking this.
5. ## IA Type II -- Population Trends in China

Hit another roadblock. Many people are saying that the researcher's model for the logistic function is dead on, but I am not getting that (despite using the calculator, putting values in list with L1, L2, Y1 and calculating the logistic regression). Is this true?
6. ## IA Type II -- Population Trends in China

Basically, try different equations until you find the best line of fit for the original function. The words "regression equations" should come in handy, you might want to google that. If you read earlier in the thread, there are programs that can graph those regression lines, no technical work involved. 1. First, find out the function you want to graph (sin wave, polynomial, linear, etc.) 2. Compare and contrast characteristics that would make this function appropriate for your original model. 3. Solve the equation for that model analytically ONLY (as in no technology) - To do th
7. ## What would you do if you were in control of IB Survival.com

I believe that a chatbox to talk in realtime would actually be really helpful.
8. ## Social Life + IB = impossible?

It can also really depend on your school. My friend has IB at his school and apparently it's very easy for him and he rarely gets any homework. We have IB and it's like murder.
9. ## IA Type II -- Population Trends in China

- Post edited so I wouldn't go against the rules and give away any answers. I PM'd you.
10. ## IA Type II -- Population Trends in China

I think I figured out the problem with the matrix. It has to be a square [7x7] to do an rref. However, I'm getting some REALLY weird numbers now... In the end, I've decided to do substitution and elimination instead. However, I am completely stuck as to how to solve a system of equations with 9 different equations. Do you think you could help me? (The problems I'm having is how to isolate variables, or how to approach the system of equations, etc.).
11. ## IA Type II -- Population Trends in China

thank you! glad to hear that basically so yeahh hmm for your analytical model (first model), you're not supposed to do that. you HAVE to do it analytically (algebraically, mathematically) so you need to use matrices as in my attachment above (quoted in post #722) instead of just finding best regression (technologically) because for yuor second model (the researcher's model) you have to find it technologically. I plan to develop it analytically later, mainly because I have trouble inputting the matrices into my calculator and using rref to solve for the equation. We were never taught this i
12. ## IA Type II -- Population Trends in China

So I've read all 37 pages, and I must say that you people are all true lifesavers. One quick question though. As I do my sextic equation on Microsoft Excel, I am receiving E values. What do these mean? Am I supposed to have these? (I do know that I have to solve the equation analytically, but I don't want my graph to be wrong). Basically, I put the graph onto an XY Scatterplot, and created an x^6 polynomial trend line.
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