Fit Definition and 368 Threads

Here is the problem: The bars of a saddle, which rest on a horse's back, rarely completely conform to the exact shape of the horse's back. I want to make a rubbery or heavy dense foam shim which will fill in the voids between the saddle bars and the horse's back so there is a perfect fit...

Hey all, I am plotting some data using MATLAB and have a question. Basically, this is what I'm trying to do. I am calling a bunch of data from Excel, plotting this data in MATLAB (it gives me two lines), and then calculating the polyfit values for each line so I can find the equation y = mx...

How would I go about creating a line of worst fit in excel? Would I create a different row for the uncertainties?

Hi all, I have a set of data that is number of counts - vs - angle. I need one angle for a calculation. I think need to find the best fit instead of an average. What would be the best way of doing this? Maybe perform a least sq calculation? The function is non-linear. Thanks in advance...

Can someone tell me how I can 'normalize' my dataset? My scenario is as follows. I have two datasets, A (real-life data) and B (simulated data). Dataset A contains 4 numerical values (from an actual experiment): -> E.g. 4 leaves from a binary tree each assigned with values...

Homework Statement I have a set of data from the DAMA experiment in which a detector attempted to measure collisions with 'WIMP's [Weakly Interacting Massive Particles] as a candidate for dark matter. The detector records the time in days of a collision event. After binning the data and...

Dear all, I have a set of measurements {xm(Ti,mi)=x(Ti)+e(Ti,mi)}, where: _xm is the measured value _x is the actual value _e is a random measurement error for the measurement mi _Ti is a parameter I need to fit a curve to this data by some method. For example, if I use least squares...

Hello, What are the error bars on the least squares fit line? recall the variables are: x ; y ; x^2 ; xy ; y^2 ; yi=mx+c ; d =(y-yi) ; d^2 --------- is it d? Thanks

why is reality described by 11 dimensions and strings? why is the most fundamental thing a string and not a very small gummybear-shaped thing? why does it fit so well? High-End math just appears to deduce more and more results from one set of axioms to the next set of statements. The...

I have a bearing that is fixed into its housing by means of an interference fit (to test the effects of having a bearing that has become stuck due to build up of contaminants). I am using a bearing of ID 15.92mm ± 0.005 made of High lead Tin Bronze Alloy with a thermal coefficient of expansion...

Hi, I have some experimental data as a function of time t and temperature T. I have done a least squares fit of the data with a function f=f(a1,a2,t,T) (the function is non linear in a1 and a2!). Optimization of e^2 = sum((yi-f(a1,a2,ti,Ti)^2) with Matlab's fminsearch gave me a1, a2 and the...

Hello, Just out of curiosity, where would following "seperation axiom" fit in? So far I'm only acquainted with the T1, T2, T3 and T4 axioms (and the notion of completely regular in relation to the Urysohn theorem).

It is desired to slip an aluminum ring over a steel bar. At 7.00° C the inside diameter of the ring is 4.000 cm and the diameter of the rod is 4.080 cm. (b) Find the temperature of the ring at which it fits over the bar. The bar remains at 7.00° C. ---- It is desired to slip an aluminum...

ok so i have some data (d) of star counts (N=181), and a model (m = b-Fo where b=5 and Fo-constant flux) I have found the chi squared value = 216 I know that the number of degrees of freedom here is N-parameters = 181-1 = 180 my question is: "show that the model is not a good fit to the...

Imagine a thick cylinder with a retaining ring groove cut in the ID. I'm replacing the retaining ring with a split ring pressed into the groove. The split ring I'll have made along with the tool to install it. What I would like to determine is the amount of interference and the force...

Hi To test the fitness of a certain model to some observational data I use ki_squared goodness of fit test. As you might know, this test is appropriate for normal distributions. In fact, one uses the standard formula: X^2 = Sum [(Oi - Ei)^2/SDi^2] Oi average of the ith bin Ei...

Hi. Which is the best software to use working on data fit distributions from your experience? Regards

I have two curves 1+m1*log(x) and 4.5+m2*log(x) [please see the attached picture]. I want to fit a third curve (which might of any equation), which should actually 'balance' the first two curves, so that the error is minimum. My problem is I am not able to get a initial reduced slope in the...

Given the following sets of data, find the curve of best fit x = -4, -6, 5, -6, -9, -2, 5 y = -4, -7, 3, -12, -2, 5, 7 a) y = a + bx b) y = a + bx + c cosx I can do part a by using the formula for least square methods for straight line. But what about part b? One way I can think of is...

Homework Statement The resistance for a wire with cross-sectional radius r is given by R = k/(r^2). Convert this equation to a straight line for which k can be determined from the slope. Homework Equations Equation of a line is: y = mx + c The Attempt at a Solution R = k/(r^2)...

I'll be in my 4th year of a Pure Math degree next year, and I'm think of what courses to fill up my timetable with. I'll be taking an overload, so I'll be taking 6.0 credits worth of courses (3.0 per semester). I'm only required to take 3.0 more courses in Pure Math to get my degree, so I have...

Hi there. I have a problem with this. I'm trying to plot a polynomial fit done with origin 8.5 on mathematica. The thing is that the polynomial plot I get in mathematica from the coefficients given in originlab don't match, and I don't know why. I'll let you some pics of what I'm trying to do...

I am currently working on a gamma ray spectroscopy lab in which i have just fit a polynomial to my calibration points. The calibration points are in a relatively straight line, from x=40 to x=450, and y=34 to y=1300 for the first and last end points respectively. Where X is channel number, and Y...

Im analyzing some data from a previous student I am trying to plot a line of best fit over the histogram and hense find the value of the coefficiants the files had to be loaded as -ascii so this is the code i have typed so far x=load('filename.mat','-ascii'); mean(x); hist(x,300) this then...

Hello guys, I need your help with understanding a fitting Algorithm, so that I could make it in a C++ program. I have the following function: g(f; f0, phi0, a, b) = phi0 + a ArcTan((f-f0)/b) Which is a function of "f", frequency. I would like to fit this function with the...

Homework Statement The Earth is a sphere with a radius of 24, 843 miles. You wrap a piece of string around the Earth so that it fits snuggly. THEN, you cut it, add 10 feet to the string, and adjust it so that it has equal height all around the world. Question: How many pieces of paper...

Homework Statement an experiment is performed to test whether the displacement D produced on a piezoelectric drive behaved linearly with the potential voltage V applied across it. The following data are obtained: V (volts) D (um) 0.1 50 0.2 101 0.3 151 0.4 198...

I have made my schedule for next semester and I am unsure if I should take Calculus III or Thermodynamics (first ME course), my schedule looks like this: ENGR 213-Applied ODE ENGR 242-Statics ENGR 301-Economic Management in Engineering MECH 211-Mechanical Engineering Drawing Either ENGR...

Hi all, I'm having problems with something I'd like to do. Basically I have a 3D scatter plot and would like to add a line of best fit to it, I've googled this but most of the answers I get are incomprehensible to me (I'm a chemistry PhD student and my maths isn't amazing). Does anyone...

In what way can one do a goodness of fit test on a set of data that contains no uncertainties? I am doing a simulated data analysis assignment for a physics lab course and they provided me with data for a supposed xray spectrum for some material. The data consists of energy bins with a count...

I'm currently trying to reassess my image of the BB and the universe in general. I've been led to believe/understand that at the moment after the creation event the universe would fit millions of times within the space occupied by a single subatomic particle. However there's something wrong...

Im a undergrad here and going to finish my last 2 years of classes. Now I really have to look at what grad school programs are offered at different UCs. The problem is that I want to do something in Quantum Optics which is somewhere under experimental quantum physics, but as I look for it almost...

Hi everyone, very excited to be here and this my first post. I have a question about data fitting by using least square fit, and the problem is: I have a experimental data set(xi, yi), and I want to fit it to single exponential y, now i tried two ways: 1. do linear least square fit to...

hello somme one know how to get the function that fit well with a curve following is my curve: [PLAIN]http://img814.imageshack.us/img814/5885/tempdepth.png thx..:smile:

Hey all. I have some data, approximately 6 months worth. It is values that do not depend on time but are represented by a pair (x, y) such that the values x is measured at a point in time y. Therefore the data is equivalent to measuring how much stock I have in a given time period, say. The...

Before you object and declare that you NEVER go out of your way to be "cool" or socially acceptable, think twice. You may be enough on the nerdy side that you'd never get a piercing or tattoo, but, in the pursuit of that nerdiness, say, have you never bought a piece of technology or a program...

My nephew needs a bit of help in finding 2 jobs to write about for his career plan, he knows what subjects he wants to do at a level but can't find any jobs that fit the subjects. The subjects he would like to do are, Technology and design Biology Chemistry Physics Mathematics, he...

Hello all, I need some help with a sheet metal part I am going to produce. The part consists of 12ga A572 grade 50 sheet metal and a 1020 or 1018 steel spacer that will be press fitted into a laser cut hole in the sheet metal. After assembly the part will be powder coated where I know...

I know that the plane through the center of mass whose normal is the eigenvector corresponding to the smallest eigenvalue of the scatter matrix of a set of points is the best fit plane. I now want to do a "weighted least squares" - would I simply multiply the...

Hi, I am trying to do a best least-squares fit to a set of data which is described by the following equation: y=a\exp(-b\ln^2(c/x)) Where a,b,c are constant parameters I am trying to find values for. Any advice on how to proceed?

Hi, my first post here and I'm not sure I'm in the right place or that I use the proper terms so please bear with me. I'm a programmer by trade, and I'm working on a project whereby I need to arrive at the best fit for a set of 2-D shapes fitting within a larger shape. Mostly we're dealing...

Best fit curve using Q-R Factorization? Homework Statement Homework Equations The Attempt at a Solution So ... It's part (a) that is confusing me. I already factored it into Q and R. But does the Q-R Factorization have to do with best-fit lines? (To be fair, I'm working on homework...

Does anyone know how one could calculate the maximum number of whole rectangles that can fit into a triangle. Say you know the length of the sides of the triangle (t1,t2,t3) and the of the sides of the rectangle (r1,r2). Thanks.

With MATLAB or something. Basically, I just have a bunch of data points where I should do a linear least squares fit, but each of the points have error bars around them.

Homework Statement How does a large DNA molecule enclosed in the nucleus of a cell? The Attempt at a Solution I know it has to do with histones and how DNA winds twice around it to make it shorter, but can anyone further expand on this? Thanks : )

As far as I know, a hyperbola has the equation So how does this (below) work? Thanks!

let us suppose we use the worst fit algorithm for allocating memory...initaially when whole of the memory is available...then it allocates full memory to one single process...hence no multiprogramming possible...hence what are the advantages of this algorithm...over first fit and best fit... Thanks

inverse best fit slope...expected vs calculated Given a set of data (X,Y) pairs, we can get the best fit line using many techniques. Assume the correlation is not perfect. We can use the least squares method to get the best fit line slope and intercept. So we have Y = mX + b In other...

Hi everybody I was set a homework but I don't know how to do it because our teacher didn't taught us something like that and I have looked in a lot of books I still don't know what to do. The question is how to determine the accuracy of a line of best fit. can somebody help me with that please...

Hello again, Part of the problem is solved. There were NaN entities in the dataset. I removed those, now a fit can be made, but still, only through 1 dataset (see figure). How to put the fit through both?? Grz. Fr@nk Hello everybody, I have a very large set of datapoints (about 500)...