Questions tagged [statistics]

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How do I use the NIST test suite to test the randomness of an RGB color image? [closed]

I would like to use NIST test suite for Cryptographic Applications on a color image to test whether the image is random or not. But I don't know how to do all these tests. I used some readymade python ...
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Block Bootstrap Estimation in Java - Part 3

This is an extension of Block Bootstrap Estimation in Java - Part 2. The text file text.txt can be found at https://drive.google.com/open?id=1vLBoNmFyh4alDZt1eoJpavuEwWlPZSKX (please download the file ...
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1answer
62 views

Manual Regression Tree using Python

I wrote a code to create a regression tree for a synthetic train data of size Np. The idea is, first I have the source node (which consists of all set of points) ...
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2answers
110 views

Block Bootstrap Estimation using Java

The data are in a file called test.txt, which is available at https://drive.google.com/file/d/1g0ffvH5oP5C4Cp6ciEp_L1Rst6WeTuYG/view?usp=sharing. There are some odd ...
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1answer
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Simulation of Central Limiting Theorem (CLT)

The following is the simulation of Central Limiting Theorem from Statistics: ...
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4answers
125 views

Statistics Library with Sample, SampleBuilder and Tests

Introduction I'm working on a Statistics Library that can record observations and produce a Summary of the statistics when there's enough observations. Right now, it's at its early stages and is ...
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1answer
51 views

Select array element by its weight/probability

I coded a function that takes an array with numbers and randomly chooses one of these numbers (Returns the index of the chosen one). The value of each number works as an weight which determines the ...
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1answer
71 views

Survey Populate with List, Option Label and Formula, VBA

I am quite a novice. The below code does what I require but I was hoping you could help me speeding it up and simplifying it please. I know should start with basics when learning VBA..but it's just so ...
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1answer
40 views

Calculate the statistical mean of different files and save it into a CSV file

In this code I calculate the statistical functions of values from different files and save them into CSV files (one filer for each statistical function). ...
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3answers
69 views

Linear Regression Class in Python

I have recently been brushing up on my statistics and calculus and wanted to implement Linear Regression, the code will be for a calculus/statistics library I am working on (I know there are libraries ...
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1answer
6k views

Calculate mean, median, and mode in Rust

I'm learning Rust using The Rust Programming Language. I'm trying the assignment at the end of chapter 8 — Hash Maps. The task is: Given a list of integers, use a vector and return the mean (...
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1answer
341 views

R function for Dynamic Ordinary Least Squares regression

SHORT VERSION: Made a workflow function, want a better output with methods. General Background I have been working on a package for some time to eliminate the tedium of preliminary time series ...
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1answer
103 views

Rolling mean lag function for multiple variables

Thanks to @josliber's help (Rolling mean lag function), I was able to speed up a rolling mean function for different groups and rollmean lengths. Now I'd like to add to this function the ability to ...
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1answer
1k views

Django Rest Framework Totaling API values in different ways

I am working on a stats website for my softball teams that I manage/play for. Here is my current Stat model: ...
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1answer
138 views

Shoe shine shop model in Rust and C++ - Follow-up

I've just refactored my Rust and C++ code which simulates the shoeshine shop model from this question. What else can be improved? C++: ...
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0answers
58 views

Return probability (Javascript)

I've been working on a personal project. There's this game called TFT which is an autochess game. Each match is played by 8 players and there's a shared pool of champions, each champion have their ...
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3answers
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Shoe shine shop model in Rust

I'm learning Rust and a few questions did arise during translation of my C++ code to Rust. There are comments in Rust code I'd like to be answered. Is there an idiomatic way to solve this task? The ...
3
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1answer
56 views

Select optimal piecewise regression fit

I'm making a program which fits a piecewise linear regression with up to 4-5 breakpoints in the data, and then deciding how many breakpoints is best to prevent over and underfitting. However, my code ...
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1answer
100 views

Gamblers ruin, parallel compute trials

Context The following script is a quick implementation of the gambler's ruin problem. For each given upper bound on the number of rounds in a game max_iter, ...
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1answer
87 views

Statistics component of Finance Tracker

I'm doing a Java software engineering team project in school and my team has decided on a Finance Tracker application, which contains the main components of Expense, Budget, Statistics, Suggestions ...
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0answers
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Using python to estimate the range of unstructured data

I have unstructured input-output data, f=f(x). I want to estimate the range of f as a function of x, given limited sampled. So, I tried to discretize the data use small bins in x to estimate the ...
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Estimate area of cropped circle with Monte Carlo

I looking around and not finding anything, I developed a simple function for estimating the area of a possibly cropped circle inside a frame. It uses a very basic MC implementation. It is pretty fast ...
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1answer
77 views

Fetch, plot, and send security incident statistics with Excel

TLDR: I don't develop for a living. If someone could point me in the right direction to make my script more readable/pythonic I would appreciate the assistance. In particular I'm struggling with the ...
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1answer
120 views

Remove outliers from N dimensional data

I have created a function that will remove outliers from a series of data. Generally the data n dimensional. Loosely, an outlier is considered an outlier if it +/- deviates by 1.5 standard_deviation's ...
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2answers
87 views

Query to plot a histogram of song ratings

I wrote code to plot a rating distribution, which looks like this: The most important function is the stats function: ...
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3answers
2k views

Finding unique pairs in lottery tickets

I was trying to solve one of the hackerrank practice questions. Could anyone please let me know how can I make this code much effective, in terms of time and space complexity? The Super Bowl ...
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1answer
43 views

Kernel based conditional increments of many stochastic processes

I have written this function is part of a research project that involves analyzing time-series data from stochastic processes. We have a small number (from 1 to 3) of independent observations of a ...
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2answers
59 views

Calculating p-value for Welch's t-test

I am attempting to translate some of my Perl code to Ruby, from http://rosettacode.org/wiki/Welch%27s_t-test I am a very very beginner with Ruby, but I have verified that this is producing the ...
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2answers
67 views

A/B testing using chi-square to calculate the significance in an elegant way

The definition of ABtest Goal: For input data, each pair row is a group such as 0 and 1, 2 and 3. I want to test whether each group is significant using chi-square. If result is significant and ...
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1answer
100 views

A straightforward method for computing the Binomial probability mass function

I've been writing up code to test an alternate way of calculating the Binomial probability mass function. The Binomial random variable is the number of heads out of N coin tosses with coins that have ...
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8answers
7k views

Prettify math formula in code

I have a function to calculate the normal distribution in Python: ...
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2answers
119 views

BiasedOptionChooser<T>: a class to do “weighted random choices”

I need to select "random" elements from a collection. Random is quoted because I must assign a weight to each element; elements with higher weights have a greater chance of being selected. To achieve ...
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2answers
2k views

Simple Linear Regression in C++

Python has amazing sci-kit learn library but I am building some projects on C++ with involves some machine learning algorithms. I found machine learning libraries in C++ involves more dependencies so ...
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1answer
116 views

Calculating difference statistics over a moving window

I'd like to calculate some statistics of given data (frequencies of difference among elements on various distances in percent multiplied by 10) using moving window within that data. Is it possible to ...
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5answers
3k views

Markov-chain sentence generator in Python

I wrote a Markov-chain based sentence generator as my first non-trivial Python program. I mainly used C before, so I probably have ignored a lot of Python conventions and features, so any advice would ...
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0answers
58 views

Find the median of two sorted arrays [closed]

There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall ...
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2answers
140 views

Statistical User-Defined Functions (UDF)

Problem The following statistical functions were created to calculate statistics of experiments: Mean Peak to Peak Standard Deviation Variance Mean Absolute Error (MAE) Mean Square Error (MSE) Root ...
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1answer
59 views
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2answers
90 views

Generate a large block diagonal covariance matrix with exponential decay

I am implementing Kalman filtering in R. Part of the problem involves generating a really huge error covariance block-diagonal matrix (dim: 18000 rows x 18000 columns = 324,000,000 entries). We denote ...
4
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1answer
115 views

Evaluate joint probability density function of a Markov random field

The following code evaluates probability mass function for all possible states of a model. ...
2
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1answer
31 views

Statistical function which computes the average work time in different months

It's a task from a Ruby-course, in which I'm currently enrolled: Ruby Course - Page Precisely it's one of the assignments for the first week. Following idea: Your are given a list in which finished ...
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2answers
162 views

Calculate mean and standard error of a generator in Python

The goal of the following code is to calculate the mean and the standard error of vectors of randomly-generated numbers. I am looking for feedback both on the correctness of the calculation, and on ...
3
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0answers
141 views

Simple Kivy App for Bootstrap Algorithm

I have a very simlpe app built using Kivy, for performing bootstrap algorithm (statistics). We must input some samples in the form x1,x2,...,xn (these will be ...
8
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1answer
606 views

Generating Latin hypercube samples with numpy

I wrote some code to generate Latin hypercube samples for interpolation over high-dimensional parameter spaces. Latin hypercubes are essentially collections of points on a hypercube that are placed on ...
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0answers
34 views

Sortings stocks into quantiles based on their signal

This function sorts stocks into quantiles. To do so I used this function that accepts sig_df (dataframe with the timeseries of stocks signal) and number of ...
4
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1answer
182 views

Pick the best combination of n choose k models

Algorithm Let \$M_0\$ denote the null model which contains no predictors. This model simply predicts the sample mean of each observation. For \$k=1,2,\ldots,n\$: Fit all \$n \choose k\...
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1answer
54 views

Entropy calculation function in Haskell

I've written a function in Haskell for calculating the entropy of a collection. I'd like feedback on how the function could be rewritten to be more flexible/reusable, and also how to profile the ...
3
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1answer
2k views

HackerRank: Climbing the Leaderboard

Below is my solution to Climbing the Leaderboard on HackerRank: Alice is playing an arcade game and wants to climb to the top of the leaderboard. Can you help her track her ranking as she beats ...
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0answers
71 views

Bias-corrected percentile Bootstrapping Optimization

I have never posted to this forum, but was referred here. I need some help printing key iterations as well as optimizing my code for run time. If someone had some time to help/explain how to correct ...
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3answers
2k views

Calculate min, max, mean and median out of array

Another C exercise: Write a function that takes an array of 'ints' as its input and finds the smallest and largest elements. It should also compute the median and mean. Use a ...

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