Updated / News:
- 2026-10-13: Decimal Hours Converter
- 2026-10-13: Time Zone Converter
- 2026-10-13: Tip Calculator
- 2026-10-13: Percent Difference Calculator
- 2026-10-13: Percent Change Calculator
- 2026-10-13: d = rt Calculator
- 2024-10-24: SAS Array Counting Guide
About
Welcome! I'm Dr. Zane Wubbena, Managing Director of Forecasting in the Division of State Funding, Forecasting & Fiscal Analysis at the Texas Education Agency. I'm also an aviation enthusiast and student pilot.
Personal Projects
PilotDECODER: An aviation weather education tool.
Tools
- d = rt Calculator: Solves distance, rate, or time from the other two and shows each step, including unit conversions.
- Percent Change Calculator: Shows the formula with your values filled in, and how to phrase the result, including percentage points versus percent change.
- Percent Difference Calculator: Compares two values when neither one is the starting point, and shows when to use percent difference instead of percent change.
- Tip Calculator: Quick 20%, 15%, and 10% options, the total, an even split, and how to work out the tip in your head.
- Time Zone Converter: Converts between UTC (Zulu) and every U.S. time zone, step by step, with a map showing the same moment in each zone.
- Decimal Hours Converter: Converts hours and minutes to decimal hours and back, such as 1 hour 15 minutes to 1.25 hours.
Selected Publications
- Wubbena, Z. (2013). Mathematical fluency as a function of conservation ability in young children. Learning and Individual Differences, 26, 153–155. doi:10.1016/j.lindif.2013.01.013
- Stewart, T., & Wubbena, Z. (2015). Systematic review of service-learning in medical education: 1998 to 2012. Teaching and Learning in Medicine, 27(2), 146–156. doi:10.1080/10401334.2015.1011647
- Wubbena, Z. (2015). Gatekeeping for “good” education, passive democracy, and the mass media. An interview with Noam Chomsky. Critical Education, 6(8), 1–9.
- Xu, L., Wubbena, Z., & Stewart, T. (2016). Measurement invariance of second-order factor model of the Multifactor Leadership Questionnaire (MLQ) across K-12 principal gender. Journal of Educational Administration, 54(6), 727–748. doi:10.1108/JEA-01-2015-0001
- Wubbena, Z. (2017). A pedagogy for space: Visually framing the 2011 Chilean student movement. Policy Futures in Education, 15(4), 460–480. doi:10.1177/1478210317694501
- Wubbena, Z. (2018). The boy who learned to read by “saving the earth.” Kappa Delta Pi Record, 54(1), 42. doi:10.1080/00228958.2018.1407183
Writing
- SAS Array Counting Guide: How to use arrays and loops in SAS to count conditional values.
GitHub Repositories
- Cartesian Product: Using the Cartesian product in SAS to track how a district's determination level changes from one year to the next.
- Cartridge Line-Up: An interactive study guide to small-arms cartridges, from the parts of a round to how eighteen common cartridges compare at true scale.
- EDFacts Metadata Deadline Calculator: Calculating internal metadata submission deadlines from EDFacts federal due dates.
- Gear Ratio Charts: Heatmap charts of bicycle gear ratios for each front chainring and rear sprocket.
- George Washington Scatterplot: Python scripts that turn X, Y, and intensity values in Excel into a scatterplot of George Washington.
- Happy Gilmore: Visualizing typical golf ball flight paths and carry distances by club type.
- Instream Data in SAS and Python: Embedding data directly in a program file for teaching, testing, and debugging.
- Nuclear Warhead Density Index: Analyzing how nuclear warheads are distributed relative to geography and population.
- PilotDECODER: The source files for pilotdecoder.com, plain-English aviation tools for student and private pilots.
- Race and Ethnicity in Special Education: How race and ethnicity data are collected versus how they are reported.
- Resources: Links to SAS, Python, database, and version control references.
- Sample Size Tables for Known Special Education Population: Generating sample size tables for auditing IEP compliance.
- Shawn Ryan Show Scraper: A Python script that collects episode information from The Shawn Ryan Show into an Excel workbook.
- Sound Therapy: A notebook that generates a tone, adds an optional spoken affirmation, and writes a one-page PDF explaining the tone.
- SPPI 3B Reading Proficiency: Analyzing State Performance Plan Indicator 3B reading proficiency for students with IEPs, statewide and by Education Service Center region.
- zanewubbena.com: The source files for this website.
