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@vladishat
Flag of Ukraine Slavutych, Ukraine
Member since December 5, 2016
4 Recommendations

vladishat

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Coherent professional with a problem-solving mentality accompanied by many years of researching and teaching experience in Ukrainian universities. With superior quality in data modeling and simulation, I am confident my work will exceed expectations. Specializing in: - Projects pertaining to Statistical/Data Analysis, Machine Learning, Mathematics, and Physics. - Consulting Businesses through Financial/Inventory/Customer Data Analysis and Forecast. Skills that pertain to this project are the following: - Excellent Communicator - Problem-solver - Attention to detail - Analytical Thinker Analysis Skills: - Regression Analysis - Factor Analysis & Sensitivity Analysis - Bayesian Analysis - Monte Carlo Analysis - Experimental Designs - Time Series Analysis - Forecasting - Statistical Quality Control - Spatial Data Analysis - Structural Equation Modeling. Program Proficiency: - R programming - Rapidminer - Matlab - Python - Microsoft Excel. I do not outsource my work; I am a one-man team. Mostly available from 9 a.m. To 7 p.m. Local time (GMT+2).
$25 USD/hr
68 reviews
6.1
  • 100%Jobs Completed
  • 92%On Budget
  • 95%On Time
  • 27%Repeat Hire Rate

Portfolio Items

Recent Reviews

  • image of aasagh2009 I need a statistician £300.00 GBP

    “he is very approachable and trustworthy . it was pleasure working with him”

  • image of James C. Data Analytics R report £100.00 GBP

    “Most professional freelancer I have worked with. Delivered great work, would reccommend.”

  • image of Darwin Q. Project for Volodymyr S. $219.63 USD

    “Excelent. I recomend your job!!!”

  • image of Zaheer H. Project for Volodymyr S. $85.00 USD

    “Good work again. Thanks [27 February, 2020]”

  • image of Joel B. Project for Volodymyr S. €90.00 EUR

    “Great Job, very fast and good communication. I would recommend.”

  • image of Zaheer H. Project for Volodymyr S $200.00 USD

    “Great as usual. Will be using him again for more projects.”

Publications

Hierarchy of categories and classifying Wikipedia articles using XML dump

A hierarchical object is built from relationships between categories and their parents. It is used in a classifier, detecting if an article belongs to possibly far parent category. Available at: [login to view URL]

Parsing Wikipedia XML dump

Article presents pretty simple parser for "pages-articles" XML dump file, capable of extracting body texts of pages, titles of pages with categories a page belongs, and names of categories with their parent categories. Body texts are not cleaned from markup, in particular because it may contain important information. For each Wikipedia's article page, calculate number of references to it from other pages. Available at: [login to view URL]

Hidden revolution of human priorities: An analysis of biographical data from Wikipedia

A study of Wikipedia biographical pages is presented. It is shown that the dates of some historical cataclysms may be reproduced from peculiarities of lifespan changes over time. Categories were merged in just two classes. Being quite constant during almost the entire history, its ratio shows a sharp jump at the end of the 20th century mainly due to growth of Sport and Art groups over all others. Available at: [login to view URL]

Mapping of X-ray contamination. A digital model

This is a digital search and mapping of X-ray sources by means of a stationary set of sensors placed around the contaminated object. The problem was solved by the genetic algorithm. It was shown that in some cases of four and more detectors the X-ray sources may be mapped if their number does not exceed much the number of detectors. Keywords: Gamma-ray imaging, contamination, mapping, genetic algorithm. [login to view URL]

Sliding Mode Control of a solar power plant at weather fluctuated irradiance

Matlab/Simulink model of Sliding Mode Control was built to optimize a solar panel performance at a fluctuating by weather irradiance. This dynamic model shows a high performance relative to the pre-calculated Maximum Power Point Tracker, which may significantly improve the outcome of a solar power plant. Keywords: INUDECO, solar power plant, Matlab, Simulink, Lyapunov function. [login to view URL]

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  • Preferred Freelancer Program SLA
    100%
  • US English Level 1
    85%

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