Simulation Model For Inventory
Nov 15, 2006
I am having a very difficult time determining how to get started with this problem in VBA. I am not sure how to generate the failures, or start the array. I have been racking my brain for quite some time. Company B makes a product that has two component parts. The results of reliability testing for each component shows that the components fail according to an exponential distribution with the following mean time between failure (mtbf).
ComponentMTBF(months)
115
224
Below are Company B's sales records for the past 36 months.
MonthSalesMonthSalesMonthSales...............................
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Jan 11, 2007
I have some Excel models out in the field with some old VBA code that is now causing problems. I regularly develop 'patch' models to make updates or repairs to user models, but need the VBA code syntax to get into a Worksheet module and change one line of VBA code.
The worksheet is named 'Forecast' and I need to change line 5 of my VBA code.
The vast majority of my users are on Excel 2000. I remember the security issues with newer Excel versions and can walk then through that, but I forgot the code syntax I need to get the job done.
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Sep 10, 2012
How do I print multiple inventory labels based on our inventory levels?
For example:
Item No 1000
Descr Window
Customer Taylor
PO 9001
Quantity 10
Item No 1010
Descr Door
Customer Jones
PO 9011
Quantity 35
I want to print 10 labels with the info from Item No 1000 and 35 labels from Item No 1010????
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Aug 18, 2009
I had been trying really hard to get some solution on COGS valuation & inventory valuation on FIFO basis. my daily transactions are typical sales & purchases.
Attached is the inventory in/out movement from Quick Books. in the column "Num" type bill is the entry from purchase bill whihc always has a reference as P/O####. This is how i will capture the landed cost against a PO., another type "Inv Adj" is inter warehouse transfer. Name is cusotmer, Inventory is my item number. in some cases it is like "2000", in some cases it is 10000:10121, and in some cases it is 10000:10200:10201 that is why they fall in different columns when i export them.
What I would lilke to do: 1) Run a report by month, by customer showing cost of goods sold on FIFO basis, I can capture sales amount by running another report.
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Aug 8, 2006
I am not an excel whiz, so I will need layman's terms if possible. I may have found a solution to my problem under another thread, but I couldn't understand it. I have only briefly worked with macros, a very long time ago. Here goes...
I have an inventory list that has not been updated for sales of the inventory, only for purchases. I have sales lists, generally by month, in separate spreadsheets. I am looking for a simple, efficient way of either eliminating or at least matching up the data in the sales list to the inventory list in order to remove sold items from inventory (on paper). I am hoping the result will be a fairly accurate inventory list, and related value, so that a physical inventory count won't be necessary at this time. Obviously I could copy all of the sales info into one spreadsheet, sort by inventory number, then manually delete all sold items from the inventory listing. I am REALLY hoping there is a better option.
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Sep 22, 2005
Has ever created a spreadsheet that used Monte Carlo Simulation?
I've been able to create one that works using the random number generator in conjunction with discrete probability distributions - that's fairly easy, just assign a probability to each discrete value in the distribution and then decide whether or not to select it using a randomly generated number.
However, I want to perform a Monte Carlo simulation that uses a continuous (not discrete) probability distribution, but how I would use the random number generator to then select a value from the distribution based on its probability of occurance.
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Aug 14, 2012
I am trying to automate a simulation with the crystal ball add-in. Specifically the simulation will go through a set of workbooks in a directory - run the simulation (monte carlo x1000) and extra the "trial values" data in another spreadsheet.
I have tried to find crystal ball documentation but I'm not having any luck.
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Oct 6, 2008
I am newbie in Excel so i got limited knowledge of programming in excel. I need to perform a dice simulation. I will toss a die repeatedly until I got all six outcomes, then record the numbers of tosses.
I tried to use the function RANDBETWEEN() in to simulate the toss of the die but I don't know how to stop my simulation.
For example, I can generate a sequence like this:
1 3 5 3 4 3 2 1 2 3 6 5 6
but I need to stop at the 11th generation since I achieve all possible outcomes (1,2,3,4,5,6) there.
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Feb 27, 2007
I have a workbook. The second tab is inventory numbers and the first tab has my inventory items. I scan in the inventory number (unique) and it adds it to my inventory sheet. As I use inventory I scan the barcode and it inputs the serial number into my used inventory tab. What I need to do it when I scan the serial number for used inventory into the used inventory sheet to have it go to the inventory sheet and delete the line for that serial number.
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Apr 18, 2007
Im setting up a fixed hedging simulation using excel and want to use solver to obtain a maximum profit. I have taken historical stock prices and then predicted future prices using the random walk process. To create the hedge I am using european calls and puts in both long and short positions. The simulation has been set up so that the options are being brought/sold when the historical data ends and then sold/payed when the predicted data finishes.
I am letting solver change the values of the strike of each of the options and also the amount purchased/sold for each of the options too! My constraints are that all the strike prices have to be >= 0, all the amounts of each particular option has to be >= 0 and that profit has to be >= 0. It is worth noting that as well as the values already mentioned, d1 and d2 values are also being calculated on the sheet which are then used to calculate the value of the options being used (using Black-Scholes model), this value is then given a realistic spread value and then 3% is added on as the brokers fee. All of the values mentioned are being taken into consideration when caluclating profit.
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Aug 20, 2013
I'm currently developing a model for a payment schedule. For example, lets say a customer purchases an item from a store, but the store receives that payment in the following month. I'm looking to develop a dynamic model so that if I change the assumption from 1 month to another term (2,3,4+ months etc.) the model will adjust accordingly.
I've started with a formula
=IF(MONTH(H3)-MONTH(G3)=B14,G11*B13)
But of course this will not work once the term is set to larger than 1 month. With B14 representing 1 month, and G11*B13 being payment information (price * quantity).
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Apr 13, 2014
1. In column A, I have models, in column B, I want to place either a "printer" if the model begins with Phaser or Laser, and if it begins with WorkCentre make it MFD. Also, if the Phaser has MFP on the end, make this an "MFD" and If Color 560 or Docucolor, make this "Out of Scope". How do I read the first part of the string in column A to do this, or do I need to make a second column with this Phaser and WorkCentre broken out?
I have this code attached, but only works if I have the word Phaser or WorkCentre.
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Dec 20, 2006
I want to create a button on this spreadsheet - the button will be called z4 in the "Yr 9 ICT" sheet
it will include the following
rows Jane Bloggs 2
rows Jane Bloggs 12
rows Jane Bloggs 22
rows Jane Bloggs 32
rows Jane Bloggs 33
rows Jane Bloggs 42
rows Jane Bloggs 44
rows Jane Bloggs 66
What do I have to do to create this.
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Jul 1, 2007
I have a sheet with a table of peoples hours they are doing during the week each day. I want the hours to be put into a model shading the appropriate times to show when people will be in. I have attached a sample sheet of what i want it to do which i have had to do my self. Sheet 1 has table in and sheet 2 has the model i want to be automatically filled in once ihave entered all my data in the original table.
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Dec 27, 2013
I have a deferred revenue model. Revenue from each month earns out at an equal rate over twelve months. Sales for each month are in column B (B21) and C. I created formulas for the first year but when I get to the second year, I'm not sure what to do, because the earned premium will include values from previous year sales and current year sales.
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Dec 14, 2009
Suppose that you have some data points and you want to fit a straight line to them. You write the line's equation in the cells ajacent to your data points, make the square of each difference, sum up all the squares and you have your objective function. Of course your line equation depends on two parameters, that you enter in two cells. Then you run the Excel Solver, enter your objective function as target cell to minimize, enter the range containing your parameters, set your constraints and off you go.
So far so good.
And now suppose that in order to generate your model data it is not enough to write a straight line equation in some cells, but rather to run a complete reactor model (contained in a macro). How do I couple that model-generating macro with the Excel Solver? Now, I actually found a solution. I wrote a Worksheet_change macro in the sheet containing the model parameters, which calls the model-generating code each time the parameters are chenged by the Excel Solver. This has worked fine for a simple example as the straight line one.
Now one of the two:.....
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Nov 15, 2009
What would be the best way to put together a cancel curve on an annual membership model?
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Feb 12, 2013
I have a question around making a summary table from a model. I will try to explain this as plainly as possible.
I have a model where you can toggle 3 different inputs across two variables. The final output number of the model will vary accordingly.
I would like to create a 3X3 table with the final output for each combination of variables. Is there a way of doing this using formulas or would I need a macro?
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Sep 14, 2012
I am charged with building a predictive model that can find items in a hospital inventory that will expire before they are used. The idea is simple: if I use an item every week, this item has an expiration date of 50 weeks from now, and I have 60 on the shelf, then I will likely expire 10 of the items.
The complexity is that there are multiple expiration dates. So, I want be able to look down a list of 3000 items, find the multiple entries of expiration dates, and isolate them based on criteria (select, for example, the first chronologically expiration date).
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Apr 27, 2014
I have recently started working on a model built by some one else and I need to add a extra row to model. The Model has lot of macros on every page. So i need to know how adding an extra row is going to affect the macros.
I understand the main problem would be that the references in the macro wont get updated which might lead the macro to malfunction.
Whats the best way to analyze which macros are getting effected.
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Feb 28, 2007
I have: + three raw data sheets (needed as 3 lots of data with 25K records in each). + I also have a model that I want to take each record from each sheet, populates some cells in a seperate calculation sheet and then gets a result - which it adds to a total (array).Finally I have + a clever macro that shows me what % of the way through I am (i.e. displays the number of record processed out of the 75K (3*25K) total)
While I have got the model to work - there is some untidy code used where I start my clever % macro for x = 1 to 75K then repeat the same instructions for running the model for each section i.e. sheet 1 : 1 to 25000, then the same instructions for sheet 2, 1 to 25000 etc etc. and then end it I want to know if there is any clever coding that will let me go from one sheet to another when there is an empty cell struck on the active sheet?
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Oct 15, 2007
I've inherited the following code, which uses solver to create a sensitivity table for a given return in a derivatives model:
Private Sub CommandButton1_Click()
'Yield Analysis
'Application. ScreenUpdating = False
x = Range("Correlation")
v = Range("SwapCur")
w = Range("DebtLTV")
Range("ValYLD").Value = 0.005
For i = 1 To 5
For j = 1 To 7
Range("ValYLD").Value = 0.005
Range("DebtLTV") = 0
a = Range("IRRung")
b = Sheets("Cashflow").Cells(35 + j, 4)
c = Range("SwapFX")
d = Sheets("Cashflow").Cells(35, 4 + i).................
It seems that the code does not cope well when negative numbers are used as inputs, as the results it gives are unexpected and incorrect. I have fiddled with various elements but to no avail. All inputs are percentages. i= 1to 5 are always positive, j 1-7 percentages, centred around "SwapFX". It is these inputs, along with "swapcur" which are now negative, and previously have not been.
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Aug 1, 2008
I have a spreadsheet that tries to model a possible stock price movement in a column. So in column A I have all dates starting from today and in Column B a specific stock's possible stock price movemens onver the next 2 years.
So dates start at A3 and stock prices start at B3 and end at A734 and B734.
This gives me ONE possible stock movement and to get the most accurate movement, I will need to model this 20,000 times.
Therefore, I want to create a loop macro that repeat this motion 20,000 times in the columns next to A and B. So which loop effect would I need to use and how would the code look like ? This is honestly my first time attempting to use a loop macro
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Aug 11, 2008
I need to optimize an Excel model with 5 variables each of which cam be any value from 1 to 20. The solution space, therefore, contains 3,200,000 combinations. I have a software(Palisade Risk) which can give out a random sampling of this solution space. I need to know how many combinations can be considered as a representative sample of this solution space - e.g. can it be 1%?.
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Apr 11, 2014
I want to take a shot at this spreadsheet exercise. Setup similar spreadsheet models.
Excel Exercise.xlsx
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Oct 22, 2009
find the attached file. Book 2 there is 4 columns ie,reg no,fleet no,product & model and on book 1 there is fleet no,reg no and model and what i need is to capture fleet no & model from Book 1.
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Nov 27, 2013
We are trying to work out a pricing model based on how many units we will produce. In production the price per unit will be really high when you produce a low quanity, and the price per unit will be lower with the more units you produce (but never reach zero). What we are trying to accomplish is to create a formula to build a pricing structure that accounts for this curve without having to price every possible scenario.
For example, if we have the following data where for 1 unit we charge $3 per unit to produce, for 5 units we charge $2 per units to produce, etc...:
1 units @ $3 per unit
5 units @ $2 per unit
10 units @ $1 per unit
What I need to figure out is how much it would cost per unit if we were to produce 3 units. I'm guessing it would be somewhere around the $2.40 mark give or take. Or say 8 units, would be something like $1.50 per unit.
Is there a formula that can calculate this? I've tried thinking of it as a moving average, or prorating the pricing.
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Jul 4, 2014
I'm try to do a what IF Formula, so I can automatically add the cost into the right year for a lifecycle cost
My criteria is in column K I have either New Build or Existing and column AT I have year 12 of the lifecycle and column AZ I have year 18
And what I want the result to say is IF Column K Say New build I want the value of the first maintenance year to start in year 18 and column k say Existing I want the value of fist year Maintenance to start in Year 12
I already have this formula in the Column AT&AZ working out he value
IF(ISERROR(MROUND((AQ$1-$Q2),$P2)),"0",
IF((MROUND((AQ$1-$Q2),$P2)+$Q2) = AQ$1,$AF2,"0"))
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Jul 16, 2007
I have historical sales for each month from the last 3 years. I would like to set up a seasonality adjustment for forecasting. I know that it won't be perfect and some may even suggest using regression, but I'd rather not. I'd like to do the following:
In a control sheet, list the months in chronological order beginning in cell A1; January, A2, February; etc., etc. through December.
Next, below each month, I'd like to have a factor. For example, in B1 beneath January, I'd like to be able to plug in 75%. This would say that for each January going forward, that it is 75% of the annual historical average for all periods. Whereas, say in June, it is 140%.
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Mar 14, 2014
I have the catalog #s of some products in column A, and I have the brand in column B, Product name in Column C, and the model # in Column D. I want to create a formula that if I select the catalog # it should autopopulate the brand in column B, product name in column C and the model # in column D!!
And I have the brand/product & model # in a different sheet!!
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