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Ellis Michael Valentiner
Principal Data Scientist & Team Lead
@VirtualFacility
previously
@Groundspeed
,
@Powerley
&
@FarmLogs
Organizer
@AnnArborRUserGroup
2025
Jan 29
Debugging Meltano: When UUID Fields Break Your Data Pipeline
Jan 28
LLMs for Feature Engineering
Jan 20
Deployment Processes
2024
Dec 11
JSON Data Patterns
Mar 6
Managing Python Versions in 2024
2023
Jan 7
The Fastest Way to Get the Most Recent Row Per Group in Postgres
2022
Jan 6
Flattening JSON(b) in Postgres
Jan 1
2021 Tech Stack Year in Review
2020
Dec 4
COVID-19 Risk by Incidence Rate and Event Size
Nov 28
Michigan County Adjacencies
Nov 27
Using Bayesian Statistics to Identify Michigan COVID-19 Hot Spots
Nov 18
BioNTech-Pfizer COVID-19 Vaccine Candidate Efficacy - Part 4
Nov 13
BioNTech-Pfizer COVID-19 Vaccine Candidate Efficacy - Part 3
Nov 12
BioNTech-Pfizer COVID-19 Vaccine Candidate Efficacy - Part 2
Nov 10
BioNTech-Pfizer COVID-19 Vaccine Candidate Efficacy
Aug 8
A Fast Method to Bulk Insert a Pandas DataFrame into Postgres
2019
Mar 22
Express.js isn't so bad
Mar 18
Discretizing data in Postgres using width_bucket
Jan 20
Advice for Aspiring Data Scientists
2018
Aug 10
How to serialize numpy.float32 (and other types) to JSON
May 21
How I became a data scientist
Apr 22
5K Data Analysis
Mar 17
Speed Test Report: February 2018
Feb 10
Speed Test Report: January 2018
Jan 13
Tutorial: How to setup SSH and WiFi on a Raspberry Pi without a screen (headless)
Jan 7
Striding Data in the Database
2017
Aug 19
Roles and Schemas in Postgres
Jun 4
Data Scientists Should Care About DevOps
Mar 26
Rental Listings Part 2 - Exploratory Data Analysis
Mar 24
Rental Listings Part 1 - Data Import/Processing
Mar 21
np.lib.stride_tricks
Feb 25
Getting Data into R Part 3 - Web APIs
Feb 23
Getting Data into R Part 2 - Databases
Feb 21
Getting Data into R Part 1 - Flat(ish) Files
Feb 16
Moving to Hugo pt. 2
Feb 15
Moving to Hugo pt. 1
Jan 11
iPhone battery replacement and 2-FA
2016
Dec 11
Predicting credit card fraud
Oct 28
Docker for R package management
Oct 14
Continuous integration may reveal your environment variables
Aug 2
R dependency hell
Apr 27
Exploring Fitbit heart rate data with Gaussian mixture models
Mar 27
Digits back to integers in Julia
Mar 24
There isn't anything to compare
Jan 20
numpy.float64 is JSON serializable but numpy.float32 is not
Jan 11
Apple's airport utility
2015
Dec 28
For future reference just use ffmpeg
Dec 16
Installing wgrib2 on Mac OS X
Nov 27
Stan Puzzle 1
Sep 22
Non-catastrophic error handling in R batch mode
Sep 21
Using RStan to analyze the Old Faithful data
Aug 19
Calculating the average of a PostGIS raster
Jul 28
Seven months with a Fitbit Flex
Jul 16
Parsing PostgreSQL connection strings in julia 0.3.10
Jun 9
Raster misalignment, snap to grid, and null values
Jun 1
Rs762551
Mar 30
Unexpected behavior getting class-specific variable importance from a randomForest object
Mar 6
julia 0.3.6: Analyzing the Old Faithful data
Mar 5
Make something
