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Email: justinren AT excelprof.com

Recent Posts

Tesla’s ticking time bomb?
China’s recent covid debacle reveals incompetent and factious management
Top 10 Bio-pharmaceutical Regions in the US by Numbers
Electric airplane makes sense for one simple reason
EV Charging Networks: The Top 8
EV prices 2022 (I): The Distribution
Choosing the right fuel (III): Whose perspective?
Choosing the right fuel (II): Total cost
Choosing the right fuel (I): fuel and carbon cost
Steps to calculate the carbon footprint of a supply chain
EV Fast Charging in the US is becoming better but still has a long way to go
The Multiplier Effect of Manufacturing: Where Jobs Come From
How large is the supply chain economy? The answer may surprise you
So Ford Wants to Do Away with its Dealers…
How much do you pay charging an EV on a monthly basis?
Excel Trick: Import Data From a Picture!
EV in 2022 and Beyond: More Good News, but Uncertainties Too
What will happen to Zoom?
If Facebook (Meta) disappeared 3 years from today (in 2025), I will not be surprised
Clustered bar chart and stacked barcharts, switch rows/columns, overlap and customize shapes
Are we still ignoring data in making covid-related decisions?
Do you really need a Power button for an electric car?
How to think about the user cases for Blockchains: A whole spectrum of access control
The fundamental problem of governance with DApps (Distributed apps)
A Great Discussion on International Trade and Blockchain
A Fascinating Recount of the US Semiconductor History
A Small Innovation, A Big Saving for the Environment
Things I learned When Lighting a Fire
Zillow’s Failure in Housing Flipping is a Classic Example of Ignoring Bottlenecks and Variabilities
How to Revive the Semiconductor Manufacturing Industry in the US
What is the Supply Chains of the Future?
A Tale of Two Chains: Supply Chain and Blockchain
Port of LA: Storage Space is the culprit?
Why Additive Manufacturing (or 3D Printing)?
Why Supply Chain Delays are Multi-faceted: A Mathematical Explanations (Without the Heavy Math)
Green Ammonia is a promising renewable marine fuel
EV is not just about making cars. It is about the Supply Chain.
Understanding CO2 Emissions for different freight transport modes (renewable as well as non-renewable)
The One and Only Michael Dell
Tesla Lease Mileage Limit and the Central Limit Theorem
Daniel Pink’s “When” is an Illuminating Book Towards High Productivity and Better Living
SHOULD I BUY OR LEASE A TESLA? PART 4: It all comes down to your apetities towards risk
SHOULD I BUY OR LEASE A TESLA? PART 3: It is not black-and-white (because we do not know the future)
SHOULD I BUY OR LEASE A TESLA? PART 2: Total loan cost (when you are sure about the depreciation)
Should I Buy or Lease a Tesla? Part 1: Leasing Cost
A great article on this thing called “supply chain shortage”
How to draw ranking data properly
Simulation: Is demand equal to sales? (Part II, and why is there a Loch Ness Monster?)
Simulation: Is demand equal to sales? (Part I)
Simulation: It all starts with a coin toss
Carbon foot-printing problem is first of all an information problem
Last-mile Transport is the Key Driver in Supply Chain Carbon Footprint
Elon Musk Gets Manufacturing
Road Transportation is the Single Largest Decarbonization Opportunity with a Clear Path Forward
Carbon Foot printing: Devil is in its details…
The Sustainability Perils of E-commerce (II): Fast and Furious (Fuming)?
Excel Pivot Table Trick: Drawing Charts Using Only Part of the Pivot Table
The Carbon-reducing Effect of E-commerce Delivery
The sustainability peril of E-commerce (I): Small batches lead to more emissions
Two-way Data Table in Excel is a great tool for sensitivity analysis
The Dawn of the Modern Power Grid Started Right Here in Massachusetts (and It was Clean Energy!)
Measuring the Carbon Footprint of a Supply Chain: 3 Scopes
Zero-Carbon Economy: A Grand -and Necessary – Vision
More power lines, or rooftop solar panels? There is no easy answer (but here is a way to think about it)
ICCT’s Report on the Lifecycle Comparisons of GHG Emissions of Gas Cars vs. EV is Filling a Void
The Most Factual and Poignant Article on the Failure on COVID Data Collection and Interpretation (So Far)
Modeling Driving Distances (3)
Modeling Driving Distances (2)
Modeling Driving Distances (1)
Digital Technology and Clean Energy
Range Anxiety for Electric Vehicles (EV) – Part I
Small change in mean can result in big change in extremes
Why Hasn’t Anybody Done This Graph about COVID-19?
Wow What a Great Data Site
Excel Shortcut Keys (2020 Edition)
How to Provide Electricity Access to Rural Africa: An Example
Why is Chick-Fil-A Picking up Market Share (and Why is McDonalds Testing Robot Fryers and Voice-Activated Drive-Through)?
Filter Data Right in your Pivot Table Fields!
Sensitivity Study (or Scenarios) with Data Table
PivotTable: Calculated Fields
Dashboard with PivotTable
Data Slicer and Timeline are Useful Reporting Tools in PivotTable
How to Draw a Combo Chart, i.e. Chart with 2 Y-axis, and Change Chart Type on a Mac
How much gasoline do we American consumers buy each week? An Example of Excel Modeling
Most Used Excel Shortcut Keys – Mac and PC
How to Draw a 3-D Chart
Chance of Nothing Happening? The Power of Joint Probabilities
This Site Has Abundant Climate Data
Here is Another Example on Why Excel will Never Go Away – Julia Computing
Tesla Needs to Be More Rigorous in Discussing Numbers
What (and when) are the most popular US cities to visit?
Google Sheets is Catching up with Excel in Charting
What is Your Favorite Data Source?
All Great Boston Area Towns Benefitting from the Housing Boom? Not Quite So
How Advance do People Make Rental Car Reservations? The Result May Surprise You!
How to Estimate Uber’s Monthly Ride Volume in 3 steps
How to Draw a Pareto Chart?
Sparkline (aka chart-in-a cell) really sparkles!
Data Table is a Secret Weapon in Excel Modeling and Analysis
“That’s twice the size of Texas. They may never find us.”
The New Histogram Tool in Excel 2016 is Handy-Dandy
To build a frequency distribution chart, do NOT use Excel’s Histogram add-in tool
Flashfill in one of my favorite new feature in Excel
Excel Tutorial: How to Load Solver in Excel (Mac)
How to calculate Time Difference in Excel
You Draw It: How Family Income Affects Children’s College Chances

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