Safety Stock Periodic Review

Problem

Compute safety stock under periodic review: z * sigma_demand * sqrt(lead_time + review_period), where z is the service-level multiplier and sigma_demand the per-period demand standard deviation.

Return 0.0 when the protection interval is negative.

Hint

The review period extends the exposure window beyond the lead time alone.

Test cases

case 1

in: [1.65,2,3,1]

expected: 6.6

case 2

in: [2,1,4,0]

expected: 4

case 3

in: [1,3,0,2]

expected: 4.242640687119286

case 4

in: [1.96,0,5,5]

expected: 0

Starter codePython

def safety_stock_periodic_review(z, sigma_demand, lead_time, review_period):
    # Your code here
    pass

4 test cases · run your code against them in the editor