# Questions tagged [data-analysis]

Data Analysis is the process of evaluating data using analytical and logical reasoning to examine each component of the data provided.

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### Parameter explained by many distributions

If we had, for example, labeled data, where for each entry (label) we have several data distributions associated to it, how can I get something meaningful from them? Is this a solvable problem? Is ...
123 views

### How to extract connected components from persistence diagram?

From the given point cloud (Fig. 1), I use Scipy-TDA to extract persistence diagram (Fig. 2). What I'm interested in is to extract 3 circles. For example, I'd like to know 3 center points and labels ...
181 views

### similarity/distance measurement between two ranked sequence

Is there an efficient way to measure similarity/distance between two sequences of ranked numbers/letters. The two sequences are of different length, and only have some elements in common? For example,...
74 views

### How to improve the efficiency of periodicity detection for long time based lined and gapped datasets

Our data set has $10^4$ data points, but has a long baseline and many gaps. As the histogram shows, the horizontal-axis is time and most of the time, there are no data. The vertical-axis is data ...
247 views

### Clustering with points lying along different 3D planes

I have a bunch of data points in 3D that lie along a few planes. What would be the best approaches to estimate the normals of these planes? Edit: There are roughly equal number of points lying along ...
21 views

### I need help developing a process to map many individual records (from a database) into larger groups

There are many rows of data in a database table, each of which contains many columns. ID (numeric - 12345, 12378, etc) Name 1 - AAA,BBB,CCC Name 2 - dd, ee, ff Name 3 - Ggg, Hhh, Iii The objective ...
1k views

### Best practice for storing hierarchical simulation data

TL,DR What is the accepted best practice in scientific computing circles for storing large quantities of hierarchically structured data? For example, SQL does not play nicely with large sparse ...
38 views

4k views

### Python implementation for Frechet Distance

I am working on a trajectory analysis project using python and its data science related libraries. I am planning to implement Frechet Distance algorithm for trajectory analysis, each trajectory has ...
99 views

### How much in depth should I cover Python? [closed]

I'm an undergrad who's studying electronics and fields like data sciences and mostly computing seem most interesting to me but have in-depth knowledge in neither. I learnt basic python last winter ...
112 views

### Implementing Frechet Distance on pandas data frame [duplicate]

I am working on a trajectory analysis project using python and its data science related libraries. I am planning to implement Frechet Distance algorithm for trajectory analysis, each trajectory has ...
31 views

### Use custom defined metric(not matrix) in Javaplex

I'm about to get started trying to use Javaplex for the first time for some application in topological data analysis (TDA) and I want to use a custom defined metric. From looking over the documents, I ...
5k views

### What is the difference between Computational Science and Data Science? [closed]

Background: My PhD was in 'Computational Science'. My dissertation was on the analysis of X-Ray Diffraction Data and analysis of thermally perturbed nuclei in the overall dynamic analysis of the ...
41 views

### How are the outcomes that generated from different predictive models combined to get more accurate predictions?

The simple average is commonly used to combine the predictions out of different predictive models. Apart form the simple average, what are the other methods that can be used for combining the ...
11k views

### Pandas limitations and its alternatives in Python

I read somewhere that Pandas was first developed for the financial world, at least not especially for natural sciences (physics, biology and so on), so is there any similar data analysis Python ...
471 views

### FFT (Numerical Recipes in FORTRAN 77)

I am trying to use the subroutine twofft which in turn uses subroutine four1 in the book(Numerical Recipes in Fortran) to ...
938 views

### Similarity of two CSV files (or more?)

A CSV file is characterized by a header, describing the n datarows to come. The header is a text string separated by a separator. A CSV header might look like (C1) ...
62 views

### library for arithmetic operations on unstructured xyz

I've got several sets of xyz-data where x,y are coordinates and z is a 'value'. I want to be able to do simple arithmetic operations on these data. The x,y locations are not necessarily the same in ...
2k views

### Is there a relationship between the covariance matrix and the partial derivative?

Suppose that there are $N$ pieces of data, each of which contains $M$ parameter values such that $N >> M$. If we put this information into matrix form ($N$ rows, $M$ columns) and then compute ...
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### Finite difference for Lighthill source term

I have experimental data containing horizontal and vertical components of speed and I need to evaluate this: $$\frac{\partial^2}{\partial x_i \partial x_j}\left(v_iv_j\right)$$ Denoting $U$ as ...
44 views

### Manipulating/Extracting Data and Developing Methods - Language Choice [closed]

As a general programming enthusiast and aspiring Bioinformatician student I have an intermediate understanding of computing (languages) as well as Java, and to a lesser extent C++. Having knowledge in ...
2k views

### Algorithms for a many-to-many generalized assignment problem

I can't seem to find any literature on algorithms which can be used to solve a many-to-many generalized assignment problem (GAP), i.e. models where not only can more tasks be assigned to one agent, ...
139 views

### Can Box-Cox transformation be applied for data of this form?

I have data of the form: X Y 3.53 0 4.93 50 5.53 60 6.21 70 7.37 80 9.98 90 16.56 100 And I want to find out $n$ so that this can be ...
298 views

### Iterative Cunnigham correction in Millikans oil-drop experiment

I tried to write an analysis program in python for the Millikan experiment based on a paper from Jones "The Millikan oil‐drop experiment: Making it worthwhile" However, I cannot reproduce the ...
41 views

### Simple Path to Route Algorithm

I'm currently conducting research into subway paths, but stand in front of a problem, with no programming knowledge and an extremely short time-limit. Probably the question I am asking is trivial, ...
307 views

### Dimensionality reduction of the domain of f(x)

I'm wondering if there is something analogous to a PCA for data sets where there is a dependent variable. (Though I am interested in any method of dimensionality reduction, PCA is just an example.) ...
855 views

### What is 'SOLVER' in R and Statistics/Analytics ?

**strong text**a) I tried to research on what exactly is a SOLVER only to find a not clear-cut simple answer. My doubts still remain after going through several sites full of discussions about it. I ...
642 views

### Should I use a database to handle large amounts of results?

Background: I am currently running a large amount parameter variation experiments. They are being run in Python 2.6+, using numpy. These experiments are going to take about 2 weeks to run. Roughly I ...
153 views

### Monte Carlo Simulation - Random Number Motivation

For Monte Carlo simulations, or any other numerical methods that rely heavily on the quality of the pseudo-random numbers generated (i.e even/desired distribution on a certain domain) for that matter, ...
148 views

### SciDB vs OLAP cube [closed]

I am working on good retrieval mechanism for big data systems. I am of view that multidimensional structures could be of great use for aggregations and querying . Multidimensional structures as ...
327 views

### Extracting time scales information from empirical cumulative distribution function

I have a stochastic process (a Markov chain actually) that has two absorbing states. I am using a difference equation to calculate the first passage time to either of the absorbing states. There are ...