1. L

    Fibonacci spiral fit

    The TV program "God Friended Me," shows ten or so events on a map to fit "amazingly" onto a Fibonacci spiral. Given a reasonable error, is such a result randomly unusual, also given the choice of spiral?
  2. K

    Best curve fit

    Hi, Good morning everyone. I'm a little confused with this one: I have a set of n data points (x and y pairs) for which I want to to do the best fit (by the least squares method maybe) to a function of the type: y = a * sin (x) + b * cos(x) + c Can you please help me define the...
  3. E

    Computing the error of a function of the fit parameters

    Hi, I'm using the Finite Center of Rotation method described at the end of this thread to estimate the center of rotation and angle between two vectors A, B of corresponding points in the plane. Effectively, it is just a least-squares method with complex numbers to find the x which best...
  4. C

    relation between order of polynomial fit and range of x data

    Hi everybody, I have y-data that span an x-data range of say 1:100. The data are nicely fitted with a polynomial fit of 3rd order (Matlab/python: polyfit(x,y,3)). I have a second set of y-data (say: yy), spanning only half of the data range, say x=51:100. Is there any reasonable...
  5. L

    When n-gons just fit n-gons

    Show when even n-gons, n > 5, can be constructed from other non-overlapping n-gons n > 2, and when odd n-gons, n > 4, cannot be constructed from other non-overlapping n-gons n > 2.
  6. C

    Goodness of fit questions

    Expected Actual %bias/RE 50 52.7 5.4 50 47.7 -4.6 100 98.5 -1.5 300 291 -3 600 651 8.5 1000 946 -5.4 2000 1940...
  7. T

    Figuring out how much can fit into a box

    If each lobster is 10 inches long, 5 inches wide, and 3 inches tall, how many lobsters can you fit in the crate? The lobsters must travel lying down. How much extra space is there? You can treat each lobster as a rectangular prism, and ignore the spaces between its claws. Your crate is in the...
  8. N

    What is the best fit for this data

    Hi I have one data set and I am looking for a function that could fit my data well. Preferably I am looking for something I can reproduce in excel and solve with solver. The function can have multiple constants, but not too many. It can also have IF-s or whatever. I am looking for the best...
  9. N

    Is this the best hyperbolic fit to this data?

    I tried to fit a hyperbolic trendline to my data using the inxtructions here: How can I add in a hyperbolic regression curve in Excel 2010? - Microsoft Community Since this way excel wont give me R^2 I used this to calculate it...
  10. R

    Double exponential fit

    Hi guys, can anyone please explain what are the criteria for a double-exponential function to give a realistic fit of a distribution? I know that the two tau values should be distinct, but how distinct? Is one order of magnitude enough? Thanks, Ruxy
  11. G

    size a sheet to fit a tube?

    I'm not sure if this is elementary math or something more advanced so I apologize ahead of time if I put htis in the wrong place. I have a large pot that needs to be lined entirely with a teflon sheet. The pot is 10" diameter, and 12" tall. I need to know how to figure out what size...
  12. M

    Fit statistics of the baseline function

    I need to show a fit of the baseline survival function of a weibull and a cox regression. But I have no idea how to do this and which statistic to take. Program: proc phreg data=burn; model timestraphyday*straphy(0)=treatment respitatory gender race percentage head buttocks trunk...
  13. F

    How does the algebra problem fit with the word problem?

    I'm having a lot of trouble with an algebra question, or rather, with my lack of logic in understanding how it should be solved. I'm just going to quote the whole bit and then try to explain how I'm thinking it through by showing how I'm solving it. I hope that this is in the right forum. I'm...
  14. A

    Minimum diameter of a circle to fit other circles inside

    Hi Is there a formula to work out the minimum diameter of a circle to fit a range of smaller circles inside it? I.e I have a pipeline which needs to be big enough (i.e have an internal diameter) to fit a varied range of smaller pipes inside it. e.g sometimes the pipe may need to house: 2 x...
  15. S

    Which books best fit for self-studies?

    I'v decided to take up physical science degree as my further studies..But there is more than a year to get into the university. So I have planned to invest my time on self-studies before the enrollment. Here is the page which have the mathematic course modules I'm going to take. I would like...
  16. B

    Polynomial equation for surface fit

    Hi, newcomer to the forum here! I am an engineer and need to estimate a surface using an equation. I use the solver in Excel to solve the equation and it has been working quite well. I have a problem with the latest surface, though. I attach an image of the surface. I tried using the following...
  17. P

    Math function to fit into the

    Dear All, Could anyone please suggest a function which would describe the following data set. I am trying to calibrate my pyrometer (non-contact, infrared temp. meter) and I want to interpolate the Voltage data within the given range of -7 to 600 deg. Obviously, I need R^2 as close to 1 as...
  18. D

    How many balls can fit into a jar

    The jar has a radius of 6" and a height of 24" and each ball has a radius of 1". So I found the volume of the jar which is \pi6^{2}(24) = \approx 2,714.33605 and the volume of the balls which is \frac{4}{3}\pi1^{3} = \approx 4.1887902 And then I divided how many of the balls can go into the...
  19. M

    line of best fit

    Q.1. A property developer is interested in determining the relationship between family income (x, in £000s) of the local residents and the floor area of their houses (y, in hundreds (00s) of square feet). The equation of the regression line used to model this relationship is y = 3.58+ 0.15x...
  20. M

    calculating coefficients to fit number series

    I have a series of experimental data, let's call it d: d[0], d[1], ..., d[n] I know, according to the theory behind the experiment, that the d series is (approximately, because of noise in the experiment) described by a function of the form: d(i) = p * i * log (i) + q * i + r where p, q and r...