Fit Definition and 347 Threads

Hey Guys, I'm a finance guy, who's developed a fascination with physics in recent years and read quite a few of the books available to non-scientist readers who want to understand this stuff. Here's my situation: - I understand Newton's gravity, in broad terms. - I understand GR in broad...

I think this command exists, but I can't remember what it is. Suppose I have a document that takes up maybe three and a half pages formatted normally, and I want LaTex to fit it into exactly three pages. I could just tweak the margins, line spacing, font size, etc. myself, but I'm fairly...

I understand that Johns Hopkins is a pre-med school. But, if I'm interested in genetic engineering, is that a good school to apply to?

I have some measurements from a physics lab experiment and I am coding in Matlab a fit for the data. [Note this is not a problem with Matlab, my problem here is theory] In normal regression of statistics the RMSE is given by: s=\frac{\sigma}{\sqrt{n}} =\sqrt{\frac{\Sigma (\epsilon...

Hey all, I have a bunch of data that varies over many magnitudes. I was hoping to use log bins to capture the short and long term features of the data. My question is, how do I bin the data, and how do I assign appropriate errors so that I can fit the data to some theory (maybe a power law)...

In regards to dark energy or dark matter... Why does the science community create new science to fit the math rather than fix the math to fit the science? Are we so confident in the math that we have to adjust the science to match? Why are we so confident in the math? If galaxies rotate...

Hello, I am trying to write an algorithm to calculate the Least Squares Fit Line of a 3D data set. After doing some research and using Google, I came across this document, http://www.udel.edu/HNES/HESC427/Sphere%20Fitting/LeastSquares.pdf (section 2 in page 8) that explains the algorithm for...

I did a least squares fit project for physics and now i have to say the value of G and the slope. I know that slope is m from the equation y = mx+b but how do i determine G?

I was wondering if someone could explain how to compute the Least squares fit to a straight line

I was wondering if someone could explain how to compute the Least squares fit to a straight line

1) Linear fit I am running an experiment to find the linear relation between displacement (X) and voltage reading (V) of the measurement, when fitting a linear line to my measured data, such that: V= m*X + b; Based on the following links...

I'm working on an experiment and trying to do some data analysis which seems to me should be fairly trivial, but I can't for the life of me figure it out. I want to know the value of some property A and to do so I'm measuring data points (x,y), which are related to the value I want by A =...

Can anyone help me with this? The basic equation in quantum mechanics says that E=n*h*v(nu) where n = 1,2,3,... How is then possible that the quantum linear harmonic oscillator has an energy E=(n+1/2)h*v? If someone can explain this, please help

Homework Statement For the following data, find the least squares fit of the given form x=1,2,3,4,6 y=14,10,8,6,5 h(x)=ae^x+be^(-x) Homework Equations The Attempt at a Solution So I tried to linearize the equation by taking the natural log of everything...

I need to fit a tail-heavy "Gaussian" curve Hi, it's been a long time since I've been around PF. Homework Statement This isn't a homework problem per se, but I've been trying to fit some scattering data using a Gaussian function using a least squares approach and it's not working so...

Hello all, I am trying to fit a surface to a 1920x1080 grid of evenly spaced data points. The values are supposed to be more or less uniform (its an image of a uniform white light source). So I would like to fit a plane to it (but maybe a paraboloid if it is not quiete uniform). What method...

Hi, I am having some 2d and 3d data files (from some nmr experiment, as a matter of fact) and the data plot for that is such that most of the points are coming together now I want to draw ellipse around 2d data point and ellipsoid around 3d data point with the condition that 90% (or any...

We are using the MatPIV Matlab toolkit: http://www.math.uio.no/~jks/matpiv/ However, we are having trouble using the toolkit with viscoplastic media. It was expected to find a yielded region and a unyielded region, however, from the results of MatPIV it appeared that the whole area was...

Will my Corsair TX750 fit in a Coolermaster HAF 932 full tower gaming case?

I have three different parts: 1. An Aluminum Bronze Outer Ring 2. A Neoprene Ring 3. A Phenolic Composite Ring. The (2) fits into a recess in (1), (2's) purpose is to seal between (1) & (3). What I would like to do is create a calculator on excel that will calculate the force required...

You can get a calculator and start counting the errors and false assumptions contained below if you want.. but I got to ask.. If the furthest we can see is 14 billion light-years away (because it's been 14 billion years since the big bang and that's all the time light has had to travel such a...

So, I have a table of data, and I'm trying to get a curve to fit the points. I haven't tried excel yet, but I have tried these things: 1) Openoffice.org 2) Gnumeric 3) XMGrace - Gnumeric was straight-forward, but lacked many abilities. - Openoffice.org couldn't fit the curve well enough...

Hi, I'm a new member who has just embarked on my journey into Quantum Mechanics and String Theory. I was a grade A student in contemporary high school physics, however i am aware that i have a lot to catch up on (i assure you the textbooks are on order), so please don't attack me if the answer...

Homework Statement i need to find the mass of a new found planet at a given radius from the sun (R) and with a given cycle length (T) Homework Equations Kepler and Newton The Attempt at a Solution of course if R and T would fit with keplers third law then there would be no way to...

The universe is around 13.5 to 14 billion years old. That means that if everything started from one singularity which was the big bang, and nothing can travel faster than the speed of light, the size of the universe must be at most 14 billion light years in size. But even that is an extremely...

Hi gurus, I was hoping you guys can help me with a little something: I have just purchased a 12V DC motor with a shaft diameter of 5.4mm (Oddly enough, the description on the ebay page says 5.5mm, but the technical drawing attached, says that its 5.4mm). In any case - i am looking for...

Hi, does anyone know how many squares of side 1 millimeter can fit in a big square of side 1000.25 millimeters ? Cheers, Aaardvark.

I have a bunch of data x1, x2, x3, ... x49, z. I need a function f(x1, x2,... x49)=z. Does anyone have suggestions for a method that they have used before or key words to google?

Well, it is confusing the meaning of the quote, "If the facts don't fit the theory, change the facts" by Albert Einstein. Anyone knows the exact meaning of it? :smile:

Hello all, I am trying to extract the 2nd degree polynomial coefficients from a curve of best fit applied in EXCEL. I know how to do it (http://spreadsheetpage.com/index.php/tip/chart_trendline_formulas) 2nd Order Polynomial Trendline Equation: y = (c2 * x^2) + (c1 * x ^1) + b c2...

Dear All, I would like to least square fit a number of measurements using several nonlinear functions with shared parameters (similar to the advanced fitting in Origin) using Mathematica. Therefor I would be interested in an Algorithm like Gauss-Newton that fits several data-set to several...

At this point, I am rather confused about the concept of DE, and even why it is called DE since it does not seem to fit into what the concept of energy is. but my question is where/how does DE fit into the standard model? thanks.

Hello everyone, I did a quick search but could not find this in the forums. I have quite a basic situation. I have been gathering data points from an experiment and was able to fit an exponential curve of best fit to it. What I want to do is approximate some values between my data points...

determining the "best fit" regression for a set of data Is there a test one can perform to quickly determine what type of regression (linear vs. non-linear) will best fit the relationship between two variables? i.e. How can one quickly determine the most probably relationship between two...

More specifically, do the leads on a TO-220 package MOSFET (http://www.alliedelec.com/Search/ProductDetail.aspx?SKU=273-1185&MPN=IRF640NPBF&R=273-1185&SEARCH=273-1185&DESC=IRF640NPBF?utm_source=Allied&utm_medium=merchandising&utm_campaign=Allied_Top_Sellers&utm_content=273-1185") fit in the...

best fit line? DOes that mean you draw a line/curve connecting the dots? Or does that mean you draw a line in between the dots leaving some above and some below? or does that mean you connect the dots but leave out the ones that dnt fit with the shape? please help

Z(x)=(50*m+m^2*tanh((a+b*i)*x))/(m+50*tanh((a+b*i)*x)) where i is imaginary unit, x is the independent variable, Z is the dependent variable, and a, b and m are the parameters. We measures variable Z at a discrete set of values of variable x: x=[1, 2, 3, 4, ...20] Z=[57.6286+0.6328*i...

I recently completed an experiment for university level physics and am currently doing the analysis of the data. This data has been transformed to fit a linear model and it fits this very well, with the line of best fit lying within all error bars. I need to provide estimate of the gradient...

Say you are Noah and you have to put two of every animal into your ark. You don't have to worry about fish or aquatic mammals. How much space would you need on your ark. Even if you put the animals into a blender so that you could fill your ark with no empty spaces would they all fit into Noah's...

I am looking at colleges right now and I was wondering what other colleges you would suggest. I am looking for a college with a strong undergrad physics program. I got a 1100/1600 (1480/2400) on my SAT's, 3.74/4.0 GPA. I am looking for colleges close to the philadelphia area, but not in the...

Hi everybody, I have a very quick question about surface brightness profiles for an edge-on galactic disk. I have surface brightness values (V-band, not that it matters) in units of mag/arcsec^2 as usual, as a function of z, which is the distance from the galactic disk's plane. I'd like to...

Please tell me if some of you know of a way, or program that I can download or use to fit a given polynomial to a set of data. I have done an experiment in which I varied two currents thru wires (Ix, Iy) and measured the Temperature at a given point (T). The polynomial is known from a model (I...

Best fit MIN/MAX line through data. Hello, I’m working with mechanical fatigue test data. Generally this data falls in a logarithmic curve relating load to number of fatigue cycles. This data tends to be somewhat erratic so there need to be a lot of samples at multiple different loads to...

I am going to apply to colleges next year and have been told by my counselor to find a list of 4-8 schools that are "good fits." What factors should I consider to find a good fit? I can pretty much picture myself doing well at any type of school. All I am really want is an academic challenge (I...

Like the title says, if you have a bunch of data you can create a best fit line For example back in school, for a linear line, y = mx + c, you just need 2 points to get a line. But what if you have more than 2 points, say 10, what is the best fit line equation or how do you do it...

I need to calculate a line of best fit, using... The least square fit method. I am upto the stage where i have created my matrix 2 x 2, and then i have invesed the matrix 2 x 2 and then got a fraction and a [2x2] matrix. Now i am stuck. The textbook has the inverse matrix, and the...

Hi, I have a set of datapoints (x_i,y_i) and I am going to make a best fit to y = c*Exp(a/x) Making the fit isn't the problem (Mathematica, etc. can handle this), but what I need is the error on a. What I have done so far is something like this: P(c,a | {x_i,y_i} ) = k * P( {x_i,y_i}...

I have to fit a curve to predict Y on the basis of X. 50 pair of (x,y) is given. On free hand plot the curve it is seen (and otherwise known also) that Y and X has 1:1 relationship. The basic nature of movement of Y is quite composite and found involving x^a, sin(c+bx), d^x , one additive...

Well, i am taking a first course in elementary statistics, so we do not actually prove anything at all. So i was wonderign how does one determine the line of best fit? y=mx+b, where m is the slope of the line of best fit, I know that the slope is equal to m=SS(xy)/SS(x), where SS(x) is...

I'm having trouble getting the answer to this homework question: How many Earths would fit into the Sun? can you guys help me in solving it, please? Thnak you