Abdominal (ABD) Pad, 8 x 10 in, Sterile

Wound CareNon-essential, 90% service targetPrimary vendor Meridian Medical Supply, lead 1.5 days, ordered every 7 daysMMS-991911

Stock position

On hand
14,534 each161.5 days of supply
On order
0 eachnothing open
Forecast rate
90.0 each/daynext 30 days
Demand over 9 days
823 eachlead time plus review period
Safety stock
193 eachempirical 90th percentile of forecast error
Reorder point
1,016 eachabove
Stockout
not projected
Recommended order
none
Inventory value
$4,360at $0.30 per each

How the forecast was made

Exponential smoothing12% weekly error, unbiased0% better than naive

A weighted recent average that learns the weekday pattern and any trend. Recent days count more than old ones.

Report card: the model was fit on history up to Tue Jul 21 and scored on the 56 days after. Weekly totals were off by 12% on average (24% day by day), and it showed no systematic bias. A same-weekday-last-week guess would have been off by 12%.

Report card, week by week

Week ofUsedForecastErrorError %
Tue Jul 21571625+549%
Tue Jul 28669625-447%
Tue Aug 4783625-15820%
Tue Aug 11741625-11616%
Tue Aug 18652625-274%
Tue Aug 25529625+9618%
Tue Sep 1547625+7814%
Tue Sep 8595625+305%
All 8 weeks5,0875,003-842%

Weekly totals in each. Error is forecast minus what was used, so a positive number means the model ran high. This window was hidden from the model when it was fit.

Demand forecast

last 180 days and the next 30
0105211todayreport card windowThu Mar 19Wed Oct 14
actual forecast, 80% and 95% range what the model said during the report card windoweach/day

The model only knows the usage history. If you know something it does not, a coming surge, a new service line, a product being dropped, adjust the forecast and the stock math follows.

Projected on hand

0safety stock 193tomorrowWed Oct 14
Projected on hand, each: today's stock plus open orders on their expected dates, minus the forecast, day by day.

Vendors and prices, last 90 days

VendorPart numberVendor descriptionSells byPaid per eachInvoices90-day spendPairing
Meridian Medical SupplyMMS-991911ABD (ABD) PAD 8X10 STRL BX/18BX of 18$0.2514$1,643reviewed 0.90
Northwind Health DistributionNW1281995Abdominal (ABD) Pad, 8 x 10 in, Sterile - 288/CsCS of 288$0.2711$845AI 0.88