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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,...
analytics
modeling
simulation
statistics
supply chain

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...
analytics
simulation
statistics
tutorial
video

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...
analytics
carbon
logistics
simulation
statistics

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
data
energy
logistics
operations management
simulation
statistics

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...
carbon
climate
data
energy
EV
statistics
video

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...
climate
data
energy
EV
statistics
visulization

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...
analytics
climate
data
energy
EV
modeling
statistics

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...
analytics
climate
data
energy
EV
statistics
visulization

Modeling Driving Distances (2)

The National Household Travel Survey (NHTS) is probably the most comprehensive data source on driving behaviors of people in the US. It captures travel by US residents in all...
analytics
climate
data
energy
EV
statistics

Modeling Driving Distances (1)

In order to qualitatively study range anxiety, one of the first steps is to understand people’s driving behavior. A basic question is: What is the statistical...
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