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Questions tagged [demand-distribution]

For questions related to probability distributions used to model demands for products or services, e.g., in an inventory or supply chain optimization context.

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2 votes
1 answer
114 views

Priority based demand fulfilment in Linear Constraint

Say I have 3 sources. D1, D2, D3. their capacity is 100, 200, 400. I want to create some constraints such that First D1 is depleted then D2 and then D3. But the catch is you cant use min or max ...
kunal chakraborty's user avatar
0 votes
0 answers
60 views

Why the lead-time demand variance is not simply the variance of the product of two independent random variables?

In many text books, I find that the variance of the lead-time demand, if the lead-time and demand are independent random variables is defined as: \begin{align} {\mathrm{var}}[LTD] = \mu_{LT}\cdot\...
Diego Lainfiesta's user avatar
2 votes
2 answers
100 views

use Forecast distribution width in inventory optimization

I have a demand forecast that gives me a distribution for future demand, for each time period in percentiles (e.g. demand for period 1 will be between 6 and 25 (zero and 100th percentiles, and i know ...
Jan's user avatar
  • 83
2 votes
0 answers
97 views

Supply chain simulation is not working. Any help please?

I am trying to simulate a supply chain scenario. Demand is random (e.g. between 100-400 units) and lead time vary 2 to 4 days for each supply. The holding cost(h), penalty cost (p) for lost_sales, ...
Roger's user avatar
  • 21
3 votes
0 answers
89 views

Car rental time series forecasting [closed]

I have the time series of car rentals/demand in a location. The time axis is every hour for 3 months. The y-axis is number of car rentals/demand. I want to do prediction for future hours given this ...
Jose_Peeterson's user avatar
0 votes
1 answer
97 views

lsqcurvefit error in simulation of demands in MATLAB

I want to simulate the demand of a factory. This is not a real problem, the demand follows this relation $D= AB^2C^3$ where $A$, $B$ and $C$ have normal distributions: $$A\sim N(10,2.5),\quad B\sim(6,...
ramin's user avatar
  • 55
2 votes
0 answers
140 views

PYOMO - Optimization for the daily production of a products demand minimizing the production cost

I am trying to build an optimization model using PYOMO for the daily production of a product demand, minimizing the production cost. I have demand, production capacity (by machine by day), production ...
PAULO CRISTIANO KLEIN's user avatar
5 votes
2 answers
127 views

Estimating optimal inventory in times of high uncertainty due to coronavirus

I'm trying to help out a relative of mine who runs a small highly seasonal business in the clothing/textiles industry. 80% of sales are in Q1 of every year, and the purchasing and manufacturing ...
leonsas's user avatar
  • 151
9 votes
1 answer
846 views

Real world demand dataset

I am looking for a publicly available real world demand data to compare the performance of some algorithms. The dataset should include some products with data of a sufficiently long period of time. I ...
Afshin Oroojlooy's user avatar
14 votes
4 answers
998 views

Good distribution assumptions for customer demand in a supply chain

Why do we normally assume normal distribution/Poisson distribution for customer demand in a supply chain? Are there other good distribution assumptions?
Yinan's user avatar
  • 379