Ozancan Ozdemir

Ozancan Ozdemir

PhD Candidate at Bernoulli Institute for for Mathematics, Computer Science and Artificial Intelligence. Machine Learning and Deep Learning Enthisuasist.

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r

Tutorial for Developing an Advanced Stock Dashboard for the S&P 500 for the 2025 Posit Table Contest

7 minute read

Published:

This tutorial breaks down the development of an R Shiny application titled S&P 500 Monitoring Dashboard for the 2025 Posit Table Dashboard. This app effectively combines interactive financial data visualization (plotly), beautiful data tables (gt, gtExtras), web scraping (rvest), and external API integration (riingo, ellmer/Gemini AI) within a custom, sleek dark theme. You can access the app through this link

How to draw a candlestick chart in R? - Both ggplot2 and plotly

6 minute read

Published:

Candlestick charts are a type of financial chart used to depict the price movements of an asset over a specific period. Each “candlestick” represents a time frame—such as a day, hour, or minute—and displays four key pieces of data: the opening price, closing price, highest price, and lowest price within that period. The body of the candlestick shows the range between the opening and closing prices, while the wicks (also known as shadows) extend to the highest and lowest prices. If the closing price is higher than the opening price, the candlestick is typically colored green or left hollow to indicate a price increase. Conversely, if the closing price is lower than the opening price, it is colored red or filled to signify a price decrease.

R’da ggplot2 paketi kullanarak Türkiye Haritası Çizdirmek

15 minute read

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2018 yılında hazırlamış olduğum R’da ggplot2 ve maps Kutuphanelerini Kullanarak Harita Cizdirmek adlı yazımda, R’da ggplot2 ve maps paketlerini kullanarak harita çizdirmeyi anlatmıştım. Yıllar içinde oldukça fazla bu yazıyla ilgili mailler aldım, ancak aldığım son mailler bu yazıda kullandığım kodların, kullandığım veri kaynağı olan GADM platformunun paylaştığı veri içeriğini değiştirmesi nedeniyle istenilen sonucu vermediğine dairdi, o nedenle yıllar sonra bu içeriği güncellemek istedim. Bu içerikte de yine GADM de bu sefer JSON olarak paylaşılan verileri kullanarak bir Türkiye haritası oluşturacağız ve bir örnek üzerinden gradyan (gradient) renklendirmeler yapacağız.

Chat with LLMs on your R environment

3 minute read

Published:

LLM provides many advantages to the users, especially for coding. Once user had to switch the windows from the coding environment to the browser to search for the solution. But now, thanks to the newly advancements, users can chat with the LLM and get the solution for their queries on the same coding environment in R.

Segmented Total Bar Chart in R with ggsegmentedtotalbar

2 minute read

Published:

Kevin Flerlage, who is a data visualization specialist, suggested a great alternative to stacked bar plot on his blog. He called this new alternative “segmented total bar plot”. This R package ggsegmentedtotalbar implements this idea. The package is built on top of the ggplot2 package, which is a popular data visualisation package in R. The ggsegmentedtotalbar function creates a segmented total bar plot with custom annotations (boxes) added for each group. The height of each box is determined by the Total value associated with each group.