From: Teleconsultation demand classification and service analysis
References | Classification criteria | Cut-of values of criteria | Classification results | Assumption |
---|---|---|---|---|
[14] | The mean number of lead times between demands | 0.5, 0.7, 2.8 | Three categories: sporadic, slow-moving, smooth | Poisson demand arrivals |
The ‘lumpiness’ of the demand | ||||
[15] | The ratio of average inter-order interval and forecast review periods | 1.25 | – | Poisson demand arrivals |
[16] | Transaction variability | 0.1, 0.53, 0.74 | Five categories: smooth, irregular, slow-moving, erratic, highly erratic | – |
Demand size variability | ||||
Lead-time variability | ||||
[13] | The square coefficient of variation of demand sizes, The average inter-demand interval | 0.49, 1.32 | Four categories: erratic, lumpy, smooth, slow | Bernoulli demand arrivals |
[12] | The number of zeroes in the last 13 periods | 5–8 for Croston method | Intermittent | – |
2–4 for the SBA method | Non-intermittent | |||
[17] | Frequency | Pareto classification (80%, 95%, 100%) | Three categories: A, B, C | – |
Demand value | ||||
[18] | The item first occurred; The average quarterly demand; The average time between demands (quarter); Standard deviation to mean ratio | 3, 8; 25; 2; 1.75, 2.50 | Lumpy | Outliers must be removed |
Erratic | ||||
Limited demand | ||||
[8] | Correlation; The coefficient of variation in demand volume; The proportion of periods with zero demand; Mean demand volume | – | – | – |