Should I Buy or Lease a Tesla? Part 1: Leasing Cost
Recently I read quite a bit of discussion on “Should I buy or lease a Tesla?”. I do not want to weigh in on which side I take, as I know it is not just about...
Category
statistics
How to draw ranking data properly
A slight problem with drawing data on ranking is how we normally think about ranking. We normally associate “#1” as the best, and “#10” as worse...
Simulation: Is demand equal to sales? (Part II, and why is there a Loch Ness Monster?)
In an earlier post, we discussed the difference between demand and sales using a simulation exercise. Now the question is: How can we visualize the difference? To start off,...
Simulation: Is demand equal to sales? (Part I)
Consider the following problem: Suppose at a retail store the annual demand for a toy is a random variable with a normal distribution of N(600, 100), i.e., with mean of 600...
Simulation: It all starts with a coin toss
There are many sophisticated tools dedicated to Monte Carlo simulation, but Excel is powerful enough to handle a variety of simulation needs. Here are the basic steps of...
Last-mile Transport is the Key Driver in Supply Chain Carbon Footprint
Does online shopping have a larger or smaller carbon footprint? Well, it depends. But depends on what? In a most recently-published study by Shahmohammadi et al (2020)...
Carbon Foot printing: Devil is in its details…
I have been reading up on the carbon foot printing work lately. A lot of interesting findings. Overall, my impression is that the modern e-commerce is not significantly...
Zero-Carbon Economy: A Grand -and Necessary – Vision
I just watched a video produced by Cambridge University called “The Climate Crisis: Towards Zero Carbon”: Well done, Cambridge! The video first shows that data on...
ICCT’s Report on the Lifecycle Comparisons of GHG Emissions of Gas Cars vs. EV is Filling a Void
Today The International Council on Clean Transportation release a report called “A global comparison of the life-cycle greenhouse gas emissions of combustion engine and...
Modeling Driving Distances (3)
Since my last post on using NTHS dataset to fit people’s driving distances, I have made some further modifications: (1) There are some very large TRPMILE data values, in...