Calculate Exponential Forecast
Jun 18, 2008
I have inherited a series of data relating to a change in a specification over a period of time and a number of cycles.
See attached.
There is already a chart which shows the data and has an exponential line.
I want to find the value of Cycles where the Average Flash exponential from the chart line is 0.131.
FYI this is to plot deterioration in a piece of tooling, 0.131 being the accepted warning level. If you feel there is a better statistical model to use for that application then I'm all ears!
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Mar 29, 2007
what is the formula to calculate variance in Excel between the actual data and the forecasted one?
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Apr 4, 2014
I have a 52 week rolling forecast that I would like to have displayed in each calendar month that it corresponds to. I have come up with a solution where it does lump the data together into months but it is not a smooth lumping of the weeks as some weeks cross over from one month to the next. Is there a way to lump each week into its respective month. My current solution places in some months 4 weeks worth of data and in other months 5 weeks worth of data. Attached is the spreadsheet that I am using. The tab "Weekly Sales" is the 52 week data which has specified the exact dates on the calendar that that week represents. The "Monthly Sales" tab has the 12 week data which has specified the exact dates on the calendar that that month represents. I've tried SUMPRODUCT but that is giving me 4 weeks in some months and 5 weeks in others.
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Apr 25, 2008
I am working with a program that creates numbers as follows:
Instead of -2.74E-6, the program writes -2.74-6. The E is left off to save space.
When I import this data, Excel automatically "does the math" so the cell reads: -8.74 instead of -2.74E-6.
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Feb 27, 2014
I have the following data
A1 - 65.23
A2 - 1923.52
A3 - 945.18
A4 - 182.54
In column B
B1 =exp(A1)
B4 =exp(A4)
both are fine, however
B2 =exp(A2) - it is showing #NUM
B3 =exp(A3) - it is showing #NUM
Same case for all larger numbers
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Dec 12, 2013
I have a frequency table (attached) that I need to be able to interpolate values between the known values on something other than a linear basis (e.g. exponential or logarithmic).
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Apr 16, 2014
interpolating numbers in excel for an exponential function. I want to know how to be able to curve a curve in 4 different ways essentially the 2 that make up the two halves of a peak and the 2 that make up the two halves of a trough. I've tried using the LINEST function to create this interpolation and it's good to get 1 of the 4 curves I'm interested in. how to do the other 3? I'm also interested in knowing if these functions "whip the tail up" as in almost like how the tail end of a "sin" function flips back up. here it is.
[URL]
For this example of the exponential function, it creates the curve in one particular direction. I was wondering how I would do it to have it curve in another direction, for example I was testing the same function, but going downwards, and also having the tail curve back up (by hump I mean to simulate a gaussian distribution with the tails) how would I do that. seems like I now have part 1 of 4 aspects of the curve. here's the attached file to show what I mean. I want to get the hump going up and then sort of reflected along the y-axis and then similar features if I were to reflect the curves on the x axis. is it possible with the functions in excel? Linest test.xlsx
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Jan 28, 2014
In excel if it changes number to exponential format it would default to, for example if number is 12345 -> 1.2345e4, 0.012345 ->1.2345e-2
I was wondering it is possible to which a function to change this default format ie for example 0.012345 -> 12.345e-3
I basically want this kind of formatting as its would display information in terms of milli, micro, pico (or the opposite side kilo, mega, giga and so on).
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Dec 16, 2008
I have some short code that imports data and account numbers that is "|" delimited. The problem I am having is that during the import, excel converts some of the account numbers to exponential numbers.
e.g. it converts 542690E24 to 5.4269E+29.
Is there a way to avoid this from occuring during the import? I tried to format the destination cells as '000000000' (all accounts are 9 digits) but it didn't work.
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Jul 25, 2006
to write a function that will exponentially weight a series of returns by a certain decay factor.
I have excel spreadsheets that can do this over several columns, like this
series of returns... rtns squared
2.50% =2.50%*2.50%
3.50% =3.50%*3.50%
5.00% =5.00%*5.00%
1.01% =1.01%*1.01%
0.75% =0.75%*0.75%
4.01% =4.01%*4.01%
-2.78% =-2.78%*-2.78%
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Dec 5, 2009
I've been working on a ss that requires me to create a function to determine a value from a exponential curve where the area of the curve is variable . The terminal points, 0,0 and 100,100 remain constant and the curve is symmetrical at the 45degree angle. How can I derive a function knowing only these things.
Here is an image to crudely illustrate what i mean [url]
The area can be 10, 20, 35% it doesn't matter, I need a way to determine the function from just the area!
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Dec 6, 2013
I am trying to find the exponential equation from a set of data in excel. The problem is that the graph does not follow the scatter plotted points on the graph. How would you remedy this?
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Dec 26, 2009
I have a bit of code that is grabbing only the first 9 positions of an alpha-numeric string. The problem I am running into is that when the alpha-numberic value contains an "E", the code turns it into an exponential number in error.
For example, I have the following in column G: 01877E107000. When I run the code, it turns into an alpha-numeric value. The result should be 01877E107 (in column K). I tried using the text function within the code.
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May 1, 2007
I was wondering if anyone could tell me how to do away with the "Exponential" appearance of numbers (in Excel) when they are formatted as text. I am working with National Stock Numbers and there are no required computations based on them being formatted as a number ... AND ... one of my constraints is that they are required to be formatted as text when imported into an Access database ...
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May 31, 2008
I use hex2dec frequently and input with a hex 'E' such as 05e8 is misinterpreted as exponential notation. I can use =hex2dec("05e8") to get the correct value, but when the hex number is in another cell, I get the exponent assumption/ conversion (to 5 x 10e8), or a # NUM error if it is in quotes. This seems like a blatant problem but I've found no mention of it in searches or FAQs.
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Mar 19, 2009
I'm trying to forecast values for B48:B56. Charted the data and a polynomial 6th order fits best. Known values in B2:B47.
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May 16, 2014
I have a list of african countries and their C02 emissions from 1990 to 2010. The question I'm asked is, who will be the top 5 emitters in the year 2020 given the current trends. I have done a lookup command and compiled a list of the top 5 emitters. My concern is though i do not know how to get the 2020 forecast of the top 5 emitters rather than the current datas.
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Jan 4, 2007
I am using the Forecast formula to give me a value from a Linear trend. However I need to limit the resulting value that is displayed within a min and max value. Background: This is to allow me to calculate the amount of bonus someone will earn depending on the Percentages of their target they achieve. The min bonus is 25% when 80% of target is achieved and max bonus is 100% when 125% or greater of target is achieved.
So the Forecast formular works great using the existing values, but i need help limiting the results to between 25% and 100%. I was trying to use a sumif formula to copy the resulting cell but only if the value fell between the 25 and 100%. I've attached the spreadsheet as I think it will highlight what i'm trying to do better than I can explain it.
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Mar 3, 2007
I try to predict some macro economic statistics but any attempt till now didn't make sense. the attached file. Note: when i used the FORECAST function the predicted values showed an unlogical drop while there seems to be a positive trend.
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Jan 31, 2014
I would like to know a way to sum the future months dollars only once the month has passed to consider that amount only in my forecast. For eg. If I have a Vendor A contract from Jan - April for $1000/per month in total for $4000. My Forecast should only be Feb-April = $3000. So my total column should only display $3000. Once Feb has passed , the forecast should only be March-April i.e $2000. How to get rolling month sum of forecast once month has passed.
Attached is a sample spreadsheet with different vendors.
Rolling sum after month has passed.xlsx
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Jul 23, 2013
I'm trying to capture a set of forecast dates in a spreadsheet. We have column 1 = forecast date, column 2 = actual date.
I also have at the top of the sheet (which I will hide when I get the forumula to work), today's date, today's date less 13 days and today's date - 27 days.
In column 3, I want a traffic light system whereby if the date in column 2 is equal to or less than (before) each of the 3 hidden dates it the cell colour will turn green, amber then red..
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Aug 9, 2013
I've attached a file that is the result of a product forecast.
What I'd like to do is minutely adjust the data in B4:K12 so that the totals shown in blue colour on Row 15 and Column O are respected.
Book1.xlsx
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Jun 25, 2014
I have added a user form to this spreadsheet to make it a little more user friendly to edit/add/delete some information. Now the API used only needs longitude/latitude (lat/lon) to be input by the user. In this case it would be good that for each lat/lon to have a custom name added by the user.
How to link the userform, that's already made, to the information in the spreadsheet?
I was thinking it would be convenient to have the "Site Name" added to a column in the sheet named "Site List" and then have the "Fore Cast Data" pull the names from there.
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Jul 12, 2012
I am having trouble finding the days on hand for each SKU. I am trying to get a formula to look at how many days will the total SKU Qty cover in the Forecast_qty. I used a vlookup to make sure the sku = sku but i cant get the days on hand number.
SKU
Total
DOH
ITEM_CODE
FORECAST_DT
FORECAST_QTY
596459
450
?
596459
7/11/2012
54
[Code] ............
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Jan 11, 2013
I'm trying to create a monthly forecast over 9 months. I know the planned cost for month 1 and month 9 but need to figure out how to spread the remaining amount over months 2-8 using a downward slope.
Here's the problem:I have 9 months to spend $28M. I know in month 1 I plan to spend $6M and month 9 $3M. That leaves $19 for months 2-8. I need to figure out what the burn rate would be in months 2-8 ramping down from $6M to $3M and not exceeding the available amount (19M)
Is there a way to caluclate this in Excel?
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Aug 29, 2013
I am forecasting some numbers and I wanted to see which function would be best suited for my task. I used the TREND function and then the FORECAST, I was expecting the same results but appeared to have slight differences.
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Sep 28, 2008
I have project start date in cell C2((MMDDYYYY format).In cell D2 I have put the total days needed to complete the project.In cell E2:E6 I have got the scheduled Holidays.
I need to calculate the project completion date in F2.We work from Monday to Saturday,Sunday being off day.
The detail is as follows:-
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Feb 10, 2008
So I'm trying to forecast the number of passengers for an airport based on their past 7 years performance. I used "TREND" to forecast the passenger number from 2008 through to 2012 with a little problem and the numbers seems reasonable. However, When I do a scatter diagram and add a trend line, my R squared value is VERY low something around 0.03. I have a limited statistical knowledge but I assume this value should be above 0.90 in order for a good fit with trend line.
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Mar 29, 2013
I need to find a way of populating a column of forecasts based upon previous sales amount and price. For instance if I have apples on special for $2 and previously sold 200 units on multiple occasions at this price but once off sold 1000 apples at special $1, but normally they are $3 selling on average 50. I would want to get a result of Forecast: 200, not 50 or anything else to far off
I've attached the sheet I currently use for work.
Dated tab: is my working sheet MerchTrend: Previous sales history, which is imported from POS system and unfortunately cells will change based upon sales
On the Dated Tab, price column includes multi buy prices (ie 2 for $3) but the Merch Trend refers to these as individual sales (ie 2 sales for $1.50) On the Merch trend, Price Type refers to promo style. (N for Normal Price, IA, S, R, IR, P are promotional)
promo sort example.xls
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Jun 6, 2014
So I am trying to make a macro that will update monthly forecast data to what the actual production/consumption data was. The production/consumption numbers come in separate workbooks (i.e. "Jan14", "Feb14") and need to be linked to the 'Book' main file. The path needs to the Jan14 needs to come into the 'Book' file, not just the values. I would like to be able to just have a button above each month that will just automatically load that month's data when it becomes available.
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