Questions on the use of mathematical techniques to extract properties from given data. Consider if your question might be more suited for Cross Validated (stats.SE) instead.

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How to specify BITS data as HEX STRING format [on hold]

How to specify BITS data type as HEX STRING format data? There is three BITS data type values: 0, 1, 2. The DEFVAL is '00'h. (I ...
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1answer
47 views

Queue and Stack in Computer Science and relation to MATH

For Creating a Queue Q we use two Stack S1,S2. for insert x in the end of Q we do Push(S1,x). for deleting element from front of Q, (if Q is not empty) we do Pop(S2). if on Q that at first is empty, ...
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29 views

Using significant figures, what would the answer be?

I've been learning about significant figures and I have a few questions. When you multiply/divide, the number of significant figures in the answer should be the same as the term with the least number ...
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11 views

Polynomial Data Fitting with Two Variables

I have the following data and I want to find the equation interpolating the given data. For example equation for given sample data is simple $a^2*b+10$ ...
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Careers in applied math with an MS other than in finance and data/machine learning?

Since I like math, I would like a career that uses alot of applied math. I'm about to complete my Master's and could do my thesis in numerical solutions of PDEs I'm already aware of careers such as ...
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31 views

How to find a graph's equation from its points

I have a set of data that constitutes the graph on the picture. What I want to know is how would I find the equation equivalent to that kind of graph? The X are on the interval $[1,10]$.
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1answer
34 views

Similarity measurement for strings of letters

Let's say, I have 10 different groups, and each group has its own string sequence. So, it should be like : G1 -> CHFAIEBD G2 -> HCFJIGBD G3 -> HCFAIJBD G4 -> HFCIJEBD G5 -> ..... G6 -> .... The ...
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1answer
15 views

Feature selection of Gabor filter

I am working with Gabor filter with level set method here. As you known, gabor filter gave many filter output. Some of them is not necessary. Could you suggest to me some method that can choose best ...
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3answers
24 views

fit sine wave to data

I have some astronomical data that I want to fit a sine wave to. I want to fit something of the form y = Asin(Ωt+Φ). I know the period of the sinusoid is equal to ...
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3answers
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fit sine wave to data

I have some astronomical data which I know has a sinusoidal component to it of the form y = Asin(Ωt+Φ). The period of the sinusoid is equal to a sidereal day. So ...
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1answer
24 views

Find median given large amount of data

Listing all the possibilities would take time. Would there be a faster and more efficent way to find the median?
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Reading Graphs to solve probability

Each point in the scatterplot above represents a person's systolic and diastolic blood presures. What fraction of the 24 people had either a systolic pressure over 140millimeters of mercury (mm Hg) ...
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Normalizing Data for Graph

Firstly, sorry for the long post, but I must be detailed in my explanation here. This is a computer science heavy topic, and I've posted it on the CS section of Stack Overflow already, but the main ...
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1answer
38 views

How do you call it when you remove the top n% and the bottom n% of a dataset?

I am currently writing about a dataset of collected handwritings. I want to show some characteristics of the dataset. For example I think it is interesting to show how long it took users to create the ...
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2answers
38 views

Creating a polynomial function with no x-intercept

I have an understanding of polynomials and how to create a function based on the leading coefficient, degrees, x-intercepts, etc. My question is how do i go about creating a polynomial function that ...
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0answers
45 views

$y=\sqrt x \rightarrow \ln y = \ln x$ problem

So I had some raw data, and it looked like there was a square root relation. I plotted graphs of $y=\sqrt{x}$ They look kind of straight. So doing the algebra and taking the ln of both sides, we ...
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2answers
29 views

Finding similarity between elements using statistics

I have a dataset of DJs in which I'm trying to find DJs similar to a specific DJ. Each DJ has a set of a genres with a certain percentage. How can I find the similarity between 2 DJs? The following is ...
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1answer
20 views

Median value resulting in negative number

I know the that the formula for finding the median of grouped data that is: $$\mathrm{Median} = L_m + \left [ \frac { \frac{n}{2} - F_{m-1} }{f_m} \right ] \times c$$ And I also know what the ...
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1answer
19 views

Data interpretation problem

Approximately what is the minimum amount of caffeine, in milligrams, consumed per day by a person who daily drinks two 10-ounce mugs of percolated coffee and one 12-ounce cup of a caffeinated ...
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0answers
20 views

Low pass filter to maintain edge information

I am looking for a kernel as low pass filter that satisfy as:I must find a kernel that statisfies as follows: In the my reference paper, the author suggest gaussian kernel that is The gaussian ...
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1answer
23 views

Multidimensional fitting of two data sets

My problem is the following: A laser gives out a bunch of data points which are reflected off a metal surface and recorded by a camera attached to the side of the laser. The image the camera receives ...
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1answer
27 views

Finding a population Function

I have been given the population of the USA from 1790 - 1980 (increasing in intervals of 10) and I am asked to solve this differential equation. Using t as time in yearrs P as size of population at ...
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0answers
21 views

Estimation of real estate

I'm working on a project on estimating the price value of real estate. First I have collected a lot of data (500 000 instances) with details such as postal code, number of bedrooms, build year, ...
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1answer
35 views

Formula to link two exponential values together - doesn't quite work

Basically, I've done a script, and I'm stuck on a formula for it. After I run the code on a cube, based on two different inputs (detail level and vertex average iterations), the resulting size will be ...
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1answer
19 views

Work out if the relationship between 2 datasets is constant

I have 2 one-dimensional datasets, let's call them a and b. I want to know the correlation between ...
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0answers
33 views

How do you use R to find the box counting dimension of a two dimensional set of data, or scatter plot?

I'm using the software R to do some analysis on some data sets for a graduate project. R has a package called "fractaldim", in this package is a function for finding the box counting dimension. The ...
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1answer
21 views

Is there a way to use the Generalized Mean to find the “best” possible mean to use for a specific data set?

I've recently learned about the Generalized Mean as an abstraction of the many different means, includeing the Geometric, Arithmetic, and Harmonic means, as well as others. It is my understanding ...
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1answer
25 views

Survival analysis in survey dropouts?

I am working with a survey data set and am curious about who abandoned it before finishing all the questions. I have information on how many questions each respondent answered (no skipping allowed) ...
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37 views

Form of a function I can fit like a polynomial that has an asymptote on x-axis and is always positive

So I have a small list of pairs of the form $(\mathbb{R}, \mathbb{R}_{\geq 0})$ and I want to fit a function to this data. Additionally I know that as $x$ grows large in either direction $y$ tends to ...
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1answer
55 views

What is purpose of correlation kernel? IIs it high pass filter or low pass filter?

I am research about correlation kernel and I have some questions that need your help. Let see the pp. 3302-3303 in the http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=6517250&tag=1 The special ...
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35 views

Linear model for data that follow gaussian distribution

I have a question about linear regression. We have the linear regression of input data $(X,Y)=((x_1,y_1),(x_2,y_2)...(x_n,y_n))$ is $$F=aX+b$$ a,b are factors of the linear line, $y_i$ is {-1,1}. ...
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1answer
86 views

Finding the range from standard deviation and Gaussian Curve

The figure above shows a normal distribution with mean m and standard deviation d, including approximate percents of the distribution corresponding to the six regions shown. Suppose the heights of a ...
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What is correlation kernel and compare with gaussian kernel

I read a paper that said about correlation kernel that defined: $$W(x-y)=(α/1+d(|y − x|))$$ where $α =  (\int(1+d(y − x)dy)^{-1}$, $(d(|y − x|))$ is spatial Euclidean distance from the central ...
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Get a set of points from Fourier plot on Matlab?

I have a program that collects raw data and also does a Fourier transform to get complex numbers. When I feed the raw data into Matlab to do its own FFT, I can get a nice plot of power on frequency. ...
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Is there any common formula to estimate the salience of peaks of a histogram?

I need to use some quantitative measure to estimate the salience of peaks and the flatness of valleys of a histogram which represents the distribution of lightness of an image. For example, if an ...
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0answers
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One-class Support Vector Machine Sensitivity Drops when the number of training sample increase

I am using One-Class SVM for outlier detections. It appears that as the number of training samples increases, the sensitivity TP/(TP+FN) of One-Class SVM detection result drops, and classification ...
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1answer
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How to determine who improved the most considering diminishing returns

My friends and I are competing in a fitness challenge against each other. We will determine the winner based on who has the greatest percentage improvement after three months. Here is the problem: if ...
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1answer
25 views

Method for detecting anomalies in timeseries?

I am exploring creating alerts for anomalies in a timeseries. Say that I have a graph like this: There are two anomalies here that I would wanted to be alerted on: First, on April 7th with there ...
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0answers
44 views

How to interpret the indicator function?

I am reviewing a paper titled " Bayesian Sampling Approach to Decision Fusion" by Biao Chen and Pramod K Varshney. This paper uses an indicator function that I am not being able understand. The ...
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32 views

What type of equation matches these data points?

Can anyone tell me what equation will match these data points? 377, 384, 1113, 1120, 19861, 19868 Wolfram Plot
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27 views

Betfair Odds Percentage Movements & Hedging

I want to determine if the odds on Betfair have decreased by a certain percentage and then calculate the hedged profit when hedging on that percentage, but it's made tricky by the fact that decimal ...
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0answers
20 views

Nyquist limit explanation

Kindly explain Nyquist in easy words. The actual question is as follows. We can attempt to display sampled data by simply plotting the points and letting the human visual system merge the points into ...
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2answers
37 views

How to find a line that minimizes the average squared perpendicular distance from the given points to the line?

I have set of points scattered around the origin. How to find a vector, such that the average squared distance (perpendicular distance) from points to the vector is minimised? Added For example, ...
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0answers
21 views

Implementation of Total Variation Regularization Algorithm (Lagged Diffusivity Algorithm)

I am trying to compute the derivative of an experimentally-measured quantity as a function of time. The data are fairly noisy, which causes problems. For instance, using finite differences (central ...
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2answers
124 views

Difference between Topological Data Analysis and Graph Technology

I'm trying to understand the difference between Oracle's graph technology which apparently has an inherent understanding of topology and Ayasdi's Topological Data Analysis technology. Are these two ...
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0answers
32 views

On the truncation of spherical harmonics

Suppose there is a function $f(\theta,\phi)$ defined on the surface of a sphere, and $\theta$ and $\phi$ are the polar and azimuthal angles respectively. Similar with the fact that a function defined ...
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1answer
30 views

Is topological data analysis useful for low dimensional data?

I often read how Topological Data Analysis (TDA) is useful especially for highly dimensional data. But, what about (apparently) low dimensional ones? Example: consider measuring the resistance of a ...
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1answer
27 views

Calculating Inflection Point in Real World Data

I can think of a few ways to get a good grasp of this problem from an experimental perspective, but I'm looking for a more general explanation that can be applied to different situations. If this ...
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1answer
22 views

Data Analysis and Probability

Two dice with a difference ... They appear identical, but one die is fair and the other is loaded so that the probability of throwing a 6 is 0.25. Bev picks a die at random and throws it, and it shows ...
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1answer
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How to work out the formula that connects several numbers

I have an interesting problem. Say I have lots of datasets like this: a = 21 b = 23 c = 58 d = 498 etc (lots of other values) X = 85 I need to find the formula ...