sim_base_stock_policy {inventorize}

sim_base_stock_policy

Description

Simulating a base stock policy where order is made every period equal to the demand sold and having a Base stock enough for leadtime and saftey stock. The Function takes a demand vector, mean of demand ,sd,lead time and requested service level to simulate an inventory system, orders are lost if inventory level is less than requested demand, also ordering is made at day t+1, metrics like item fill rate and cycle service level are calculated. the min is calculated based on a normal distribution or a poisson distribution, also min can be set manually. demand and base adjustment (if any) is ordered every period.

Usage

sim_base_stock_policy(
  demand,
  mean = FALSE,
  sd = FALSE,
  leadtime,
  service_level,
  Base = FALSE,
  ordering_delay = FALSE,
  shortage_cost = FALSE,
  inventory_cost = FALSE,
  ordering_cost = FALSE,
  distribution = "normal",
  recalculate = FALSE,
  recalculate_windows = FALSE,
  plot = FALSE
)

Arguments

demand

A vector of demand in N time periods.

mean

average demand in N time periods.default is FALSE and is automatically calculated. otherwise set manually.

sd

standard deviation in N time periods.default is FALSE and is automatically calculated. otherwise set manually.

leadtime

lead time from order to arrival (order to delivery time)

service_level

cycle service level requested

Base

integer,Default is False and calculated based on mean and sd(normal) or rate of demand (poisson)

ordering_delay

logical,Default is FALSE,if TRUE, orders are delayed one period.

shortage_cost

numeric,Default is FALSE shortage cost per unit of sales lost

inventory_cost

numeric,Default is FALSE inventory cost per unit.

ordering_cost

numeric,Default is FALSE ordering cost for every time an order is made.

distribution

distribution to calculate safety stock based on demand distribution, current choices are 'normal' or 'poisson'

recalculate

integer, the mean and sd is recalculated every X periods from first period to x,default is FALSE .

recalculate_windows

integer, the min mean and sd windows to recalculate , for exammple if it is set to 4 mean and sd is calculated from t to t-4,,default is FALSE .

plot

Logical, Default is False, if true a plot is generated

Value

a list of two date frames, the simulation and the metrics.

Author(s)

"haytham omar email: <[e-mail]>"

Examples

sim_base_stock_policy(demand = rpois(90,8),leadtime = 6,service_level = 0.95,recalculate = 5)