I'm trying to implement the linest formula in a programming language for my coursework.
I've looked on excel help but it only explains on how the function selects data.
how to the values are calculated and the steps?
I can do least squares fitting utilizing LINEST and a worksheet. (See attachment.)
I would like to do the same calculations entirely within VBA.
I can specify the values as arrays within VBA :
Sub linest2VBA()
'
' linest2VBA Macro
'
' Keyboard Shortcut: Ctrl+Shift+A
'
Dim dXvalSqd(4), dXval(4), dYval(4), dFirstRegStat As Double
Dim i As Integer
Second Question:
Is there a way to get the remaining regression statistics within VBA by referencing only the three arrays: dXvalSqd, dXval, and dYval?
I have instances where my Y variables sometimes contain a zero in the data and i need a formula to skip over that data point in the LINEST calculation.
Y variables are in Row 1, Columns A:E
X variables are in Row 2, Columns A:E
The following formula is returning a #VALUE! error: .....
I have a table something like this (much bigger in reality)
1 5
2 10
5 15
7 #N/A
9 20
12 25
I need to interpret the above data with the linest function, but for a variety of reasons i cant delete the error square. How can i get the LINEST to ignore the #N/A and the 7? otherwise it returns an error.
I am using Excel 2007. I have two sets of data. y-series is 58.61, 58.66, 58.71 and 58.76. x-series is 0.8313, 0.8309, 0.8305 and 0.8301.
I am trying to fit a quadratic function to this data. When I plot a curve and fit a trendline I get the coefficients for the equation ax^2+bx+c
a=1.3939e-11
b=-125
c=162.5225
The plotted line seems to fit the data fairly well.
However, I want to use the linest function and I am using the formula:
=INDEX(LINEST(B2:B5,A2:A5^{1,2}),1,1)
I change the index column number as appropriate to get the coefficients:
a=-75.23775
b=0
c=110.603763
The coefficients from linest seem to be way out. how I can get the output from linest to be the same as the trendline?
My "calculated" polynomial is not the same as the Trend line on the graph. The one on the graph seems to be correct.
Basically, I am using the LINEST function to create a polynomial equation inorder to extrapolate data. And also with a given equation, and a given y, find x.
I am calculating variables in Vba and want to find their co=effiicients in the for y=a +bx +cx^2. This works great if I output my variables to excel and then pick up this range however as I am generating the variables in vba and have an array of variables I would rather not have to keep spitting them out to excel then picking them up again. The three important lines in my code are:
c(nFix - j) = WorksheetFunction.Index(WorksheetFunction.LinEst(inpv, Application.Power(inps, Array(1, 2))), 1)
b(nFix - j) = WorksheetFunction.Index(WorksheetFunction.LinEst(Range(Vc), Application.Power(Range(SPd), Array(1, 2))), 1, 2)
a(nFix - j) = WorksheetFunction.Index(WorksheetFunction.LinEst(Range(Vc), Application.Power(Range(SPd), Array(1, 2))), 1, 3)
As you can see for c I am referring to inpv and inps these are arrays. I have tried using inpv(), etc but no luck
b and a work great, here I am reffering to ranges Vc and SPd. As I am going through this a lot of times it seems rather inelegant not to be able to do the whole thing in vba - i would rather not use the dump to spreadsheet then pick up again approach!
is there a way to use LINEST in a way in which the x values are unknown and the y values are known? The opposite of how the function usually runs...?
View 2 Replies View Relatedhow to get my LINEST function to work properly. Now, what I'd like to do is have it reduce or increase the order of the polynomial until R^2 equals 1.0, or the polynomial reaches 6th order, whichever comes first.
Can I do this with a bunch of nested IF ELSEIF statements, or is there a cleaner way to do this?
I am trying to obtain the 3 coeffs from a polynomial trendline equation.
The equation produced on the chart is
y = 3.1123x2 + 135.34x + 124.9 from the below info
X Y
1.0 250
2.5 500
5.0 890
7.5 1290
10.0 1800
But when I enter this array formula
{=LINEST(B2:B6,A2:A6^{1,2})}
I get different results.
-48.98,375.89,214.98
I need to know how to selec no-adjacent columns for the known_x's in the linest function:
Example:
'- A B C D E
1) 80 63 9 3 26
2) 80 63 9 3 21
3) 74 65 7 2 30
4) 74 65 7 2 20
5) 63 65 9 3 16
=LINEST(A1:A5,KNOW_X'S,TRUE,TRUE)
Is there any way to select for instance: column B and E as known_x's?
I heard about something where we can select total area and then choose which columns should be considered via "{column1, colum2}"..
That is all is missing for me to finish my project!!! Pls your help!!!
I have built a user defined function called: portAlpha.
Code:
Function portAlpha(assetCode As String, indexCode As String) As Double
Dim assetCol As Long
Dim indexCol As Long
Dim assetData As Range
Dim indexData As Range
With Sheets("Data")
[Code] ......
I am struggling to get this to work though. Everytime I step over this piece of code:
Code:
portAlpha = Application.WorksheetFunction.LinEst(Range("M4:M63"), Range("N4:N63"), 1, 1)
I get a "Type Mismatch Error". All the values in the range are numbers, and LINEST should return a double, so I am puzzled as to why there is a mismatch...
I have hardcoded the range into the formula just to try and get it to work. Eventually this will be two variables and will look like this:
Code:
portAlpha = Application.WorksheetFunction.Index(Application.WorksheetFunction.LinEst(assetData, indexData, 1, 1),1, 1)
I am trying to use the LinEst function in a program. There are some good examples on the web but they all refer to a range in the format “A1:A45”. Is there a way to refer to a column in an existing array instead?
For example (thanks to Shg for this code): ....
I have set up regression in excel using the linest array function which automaticly updates whenever the data it is references changes. Currently the formula in K3 =
=LINEST(K8:K50,M8:N50,TRUE,TRUE) .
Only the Y range in column K changes and then the formula automaticly recalculates the regression parameters. However sometimes the range of valid data changes with each new update so currently K8 to K50 contains valid values and so the formula works. But if the range of valid data now ends at say K45, and the remaining rows (K46- K450) contains #DIV/0!. In this case the formula does not work and I need to go in manualy into K3 and reselect the range to get it to work (in the baove case to =LINEST(K8:K45,M8:N45,TRUE,TRUE)
Is there anyway I can get the formula to update the range (the number of rows to use) in the calculation automaticly so I don't have to go into the formula in K3 and change the range manually everytime the data changes? Basicly I like to use all rows in column K (from K8 to K50) where there is a values and ignore cells with #DIV/0!
I'm guessing the easiest way to do this would be to set up a dynamic range of some sort that feeds into the linest array function so that the end row reference for columns K and M & N changes depending on where the first #DIV/0! occurs in column K.
I'm using Excel 2003 and I'm trying to make my LINEST function and the source cells for a scatter graph use the cell range specified in another cell in the document. I figured out that it was simple to do the following:
I250 contains: 10, shows: 10
I251 contains: ="I"&I250, shows I10
But I can't figure out how to do this in a larger function. I've tried a few things but none of them work. Here is an example where I want it to do a LINEST with y values in cells Ja - Jb and x values in cells Ia - Ib (where a and b are integers specified in cells I250 and J250 respectively):
make a calculation(addition) and use the answer to multiply against another addition calculation....
The sum of (Monday!A1:A4) multiplied by the sum of (Monday!B1:B4) plus (Tuesday!A1:A4) multiplied by the sum of (Tuesday!B1:B4) and so on.
I have a series of monthly revenues and want to calculate each month a commission % - but only want this commission calculated up to a defined limit from the previous months and current month and then to stop when the limit is reached.
View 13 Replies View RelatedA
B
C
D
F
1
Received
Overdue
Completed
Untouched
[code]....
Overdue is received in previous slot and still under dependency.
Formula used for untouched - B2+C2-D2
SLA Target Min - 98% and Max 99%
Algorithm - (Total Number of Allocations completed within 5 business days Plus Type A Exclusions) / Total Number of Allocations received minus Type B Exclusions) * 100
I need a individual SLA achieved % which includes untouched too.
Hoping someone might be able to kindly help me out with this one. It's for a spreadsheet of call charges (credit crunch thing).
On the sheet, I have the call charge up to an hour ($H$5). Over an hour, it's charged per minute at the rate in $H$6.
In cell E27 I can enter the number of minutes for the call.
So basically, if E27 is up to a value of 60 then the cost is just H5, if the value in E27 is 61 or more then it's H5 + (E27-60)*H6.
I'm thinking it's an 'IF' but keep making a mess of it...
How do I calculate YTD from 1 MTD cell? The YTD cell needs to keep a running total of the MTD cell. If the current YTD cell has the number 11 in it and I typed 2 in the MTD cell the YTD cell needs to increase by 2.
View 9 Replies View RelatedWhat I need is to add a field that gives a gross margin percentage for a project.
To begin, I simplified the following data that the Pivot Table is using. Project (10 different projects), Account Number, Account Category (Revenue, and Cost), Debit Amount, Credit Amount, and a manually inserted column named Total (CR Amount - DR Amount). See 1st image. Pivot1.jpg
I have designed the Pivot table so it lays out like this. Pivot2.png Pivot3 (2).png
I have been trying to enter a calculated field that would automatically provide the Gross Margin Percentage. In the 2nd image, the Grand Total is the gross margin, but I am unable to use that as a selection when creating a calculated field.
I am trying to figure out the calculation steps that Goal Seek is doing behind the scenes so I can create the formula rather than clicking on goal seek whenever I need to make a change. I need to maintain certain weeks of supply every week depending on the sales. Let's say i want to maintain 5 weeks of supply every week, I would like to insert a column for "Suggested To Order' column that would change if weeks of supply goes below 5. In this scenario I would do a Goal Seek, but I want to automate the calculation so I don't have to do this step every week.
View 2 Replies View Relatedi need to total a range of cells, however, these contain time values; hh:mm:ss. it shows me the total when all cells are highlighted. but =sum() doesn't work.
View 2 Replies View RelatedI have a spreadsheet with several formulas where I have to go into each one of them to activate the calculation. I use F2 and enter. Automatic calculation is on. Do any of you know how this can be done automatically. A VBA-code will fit the purpose.
View 3 Replies View RelatedMy understanding of Excel is that the calculations are performed in Column A first and then down through the rows in Column A. After all the calculations are finished in A, the calculation moves over to Column B and down the rows in B. Is this true?
I know that Excel is a little more complicated than that especially when it creates a queue for calculations, etc. However, assuming there's no calculation list/queue, would the above be correct?
I'm creating a spreadsheet to calculate materials with the following columns Cost/10% of Cost/Customer Cost/Qty/Total cost.
I understand that whilst showing rounded to 2 decimal places excel stores more than this in the cell. which then throws out the Total cost by a few pence.
My research leads me to believe I need to use the ROUND function but I'm unsure which cell to use it or how.
I have spreadsheet that tracks the the rain total for several days. I would like to be able to break it down to the days of weeks that has rain and how much without manually imputing the data.
Days | #of times | total amount
Mon
Tue
Wed
Thu
Fri
Sat
Sun
I have a data in excel , sample sheet attached.
and i have another place for compile where all the data is summarized
What i want is
If the agent name is example 1 and his mistake is present in raw data and it matches the agent id , date and financial then i want excel to calculate how many " financial " error agent made on that particular date only so that i can assign to another agents too , to get exact data no matter in whichever series that data is inserted in excel.
if i use countif and if all the condition are met it shows me all financial mistakes count and if it shows false it turns to zero . if agent make " financial mistake " on 1st nov and he made another non financial mistake then as it should show only the count of that particular agent " financial mistake " on that date only from the given RANGE DATA
I use VBA with the macro recorder. Now I'd like to programming a code to calculate the average of three cells.
I've done a lot of measurements about 180 but it can be also more. For one test object I've always done three measurements to get then an average.
My values are beginning in cell C2:CXXX, D2:Dxxx and E2:Exxx. For example I'd like to get the average from C2:C4, D2:D4 and E2:E4. The result of C2:C4 I'd like to have in cell H2, the result of D2:D4 in cell I2 and the result of E2:E4 in cell J2. Then the next calculation is C5:C7, D5:D7, E5:E7 and the results in H3, I3 and J3. And so on.
I've attached my excel file, maybe I didn't explained it well. The VBA-Code is for sheet Export.
CalculationE.xlsx
Is there an in-built function within Excel that will help me ascertain what year is next year, and what year is the year before current? I am using =YEAR(TODAY()) to ascertain what year we are currently in, but cannot figure out how to go one backwards and 1 forwards?
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