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...
Carbon foot-printing problem is first of all an information problem
Carbon foot-printing problem is, first of all, an information problem. In a recent report released by World Economic Forum, the first challenge in reducing carbon emission is...
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)...
Elon Musk Gets Manufacturing
Why is large-scale manufacturing hard? This is one thing that many people do not quite grasp. And indeed it can be hard to explain, because there are a number of governing...
Road Transportation is the Single Largest Decarbonization Opportunity with a Clear Path Forward
My apology for the unwieldy title. But I chose the long title to highlight one thing: Although there are many decarbonization opportunities with large impact, road...
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...