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.

71 questions
Filter by
Sorted by
Tagged with
27 views

What are the Exact Rules for Significant Figures, Precision, and Uncertainty?

In the physical sciences (which are physics, chemistry, astronomy, materials science, etc.), we learned that the uncertainty is +/- the smallest unit (which is 1) of the last significant figure if the ...
33 views

Computing the overlapping area of curves

I have a set of datapoints that correspond to 5 curves. Sample dataset and MATLAB inputs: ...
• 533
52 views

Fitting gauss-hermite-parametrization to data?

I want to fit this data. I have the following model functions. Classic gaussian: def gauss_model(x, mu, sigma): return np.exp(-0.5*((x-mu)/sigma)**2) And ...
42 views

Bounds condition for IFT to obtain a $1/f$ time-series

I am coding a function to obtain a randomized time-series from a given $\frac{1}{f}$ law. The randomization is obtained by introducing a random phase in the function. I experience a problem in the ...
• 61
141 views

...
33 views

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 ...
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 ...
41 views

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 ...
• 109
1 vote
129 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 ...
• 121
1 vote
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 ...
• 121
1 vote
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 ...
• 111
6k 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 ...
• 2,109
42 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 ...
• 111
1 vote
534 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 ...
• 83
434 views

Is resampling more accurate than block average for statistical analysis of data?

I'm working in laboratories where molecular dynamics data are almost always analysed usign block average as stated in the famous Allen and Tildesley book. We divide the datas in blocks of size $M$ on ...
• 323
1k 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) ...
• 201
1 vote
68 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 ...
423 views

what is the best theory/model to use for prediction in multivariate data?

I use software for pollutant propagation on rivers that takes as input a set of parameters ($p_1,p_2,\ldots,p_n$) and creates an output file which is basically a matrix where on each row the ...
1 vote
77 views

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 ...
• 145
3k 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 ...
• 2,109
244 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,...
• 63
1 vote
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 ...
• 11
322 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 ...
612 views

Power series regression linear fit in VBA excel

I wrote a program that calculates the best fit in VBA excel for the following model $$y_k=c_1x_k+c_0+c_{-1}(x_k)^{-1}$$ solving for the best fit parameters $c_1$, $c_0$, and $c_{-1}$. However I ...
46 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, ...
• 21
149 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 ...
• 119
2k views

Gonzalez algorithm

I'm getting confused about implementing the Gonzalez algorithm for k-center clustering. The algorithm is : let $S$ be a data set Choose $z_1 \in S$ arbitrarily. Number $z$ is center. (In general ...
• 21
917 views

What is "SOLVER" in R and Statistics/Analytics?

I tried to research 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 need to clarify as to ...
321 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.) ...
159 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, ...
703 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 ...
1 vote
150 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 ...