Compents Of Chart Trendline Equation
Jun 7, 2008
I'm in the middle of designing a sheet that (amongst many other things) takes the equation of a graph trendline, pastes it, and calculates the various values along it. I can do it by hand, but when I try to record a macro, it doesn't register that I've highlighted the equation and hit copy. Here's the code I'm working with:
Sheets("Graphs").Select
ActiveSheet.ChartObjects("Chart 1").Activate
ActiveChart.SeriesCollection(1).Trendlines(1).DataLabel.Select
Selection.Copy
ActiveWindow.Visible = False
Windows("Copy of HRA Design calculator1.xls").Activate
Sheets("Binder @ max. stability").Select
Range("A1").Select
ActiveSheet.paste
The problem is line 4 - it can't copy because the text isn't selected.
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Apr 7, 2012
I tried to record setting a trendline to 100% transparent but this action doesn't seem to record.
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Oct 3, 2006
i have a workbook that contains a series of worksheets. the workbook is a master document list. the first worksheet contains no data. the remaining worksheets are arranged so that A1 has the document number, A2 contains the document title, and A3 contains the review date. Id like to create a search macro that can search for the string entered into textbox1. if this is a number, the macro should search A1:A50 of all but the first worksheets in the workbook, and if its text, the macro should search B1:B50 of all but the first worksheets.
the macro should then select the cell containing what was searched. then id like the macro to prompt me and ask if id like to modify the reviewed date to todays date. d like to be prompted to continue searching for other records if they exist, and after that loop has finished to set the focus back to the search textbox.
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Apr 24, 2014
The trend Equation on a chart is of the form y= a+x.(b+c.x) I want to use that equation in a spreadsheet to calculate value of y for the value of x. I can do it manually by inserting the a+x.(b+c.x) in a cell but would like it to be automatic as the a, b, c in the Equation changes regularly as more data is acquired.
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Jan 22, 2009
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?
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Dec 29, 2013
I have created a scatterplot with a trendline and I need a formula to represent the trendline so it can be applied to separate results. How I can create a formula and an R2 value?
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Feb 2, 2014
I need to solve about 450 excel sheets for my project.
The spreadsheet has X and Y data and curve is plotted. I need to split the curves into 3 parts based on slope change.
I can do it manually but I need an excel Macro which does this work.
A sample is attached : Excel forum-Lab data.xlsx
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Dec 4, 2012
I have been doing some statistical anaylsis in excel and have been using trendlines within scatter charts quite a bit.
I know excel can display the equation of the line as well as the r-squared on the chart. Is there any way to get the values for the trendline to appear in a cell next to the corresponding chart data? Of course, I can simply enter the formula myself that is given on the chart, but I am wondering if there is a way to do it automatically.
I have included the data below along with the trendline value that I calculated by manually entering the formula from the scatter chart.
Code:
YXTrendline Value
$78.990.53$79.79
$78.730.53$79.73
$80.550.52$80.88
[Code]....
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Apr 25, 2006
I need VBA to copy the values from a treadline output box on a chart to a new sheet. The macro recorder produces the code below, but I need to make the 5th line generic so that the code will apply to any workbook. The code below will not run without the "Windows("Test.xls").Activate" statement, which restricts the code to a workbook of a specifc name (Test.xls). How can I make this run for any workbook name?
Sub CopyTreadlineData()
Sheets("A").Select
ActiveSheet.ChartObjects("Chart 1").Activate
ActiveChart.SeriesCollection(1).Trendlines(1).DataLabel.Select
ActiveWindow.Visible = False
Windows("Test.xls").Activate
Sheets("Beta").Select
Range("B15").Select
ActiveSheet.Paste
End Sub
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Nov 6, 2006
is it possible to export a trendline equation from a graph to a cell, or at least to export the coefficients? If yes, how?
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Feb 13, 2009
I'm trying to determine the percentage rate of change in a trendline. I've got a sales chart with 90 days worth of sales figures. I can see that the trendline is trending down, but I'm not sure exactly how much.
If you take the first data point in a trendline and subtract it from the last data point and then divide that by the first it should give you the percent change. Excel must be able to do that math for you but I can't even figure it out to save my life. I can't even figure out how to display the first and last data point much less the "rate" of change I'm looking for.
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Jul 17, 2014
i have a function in a cell (that works) to extract coefficients from a range of cells in a workbook:
VB: =INDEX(LINEST(CP25:CP27,CQ25:CQ27^{1,2}),1)}
i have variables for cp25:cp27 and cq25:cq27 already defined in my vba code. the values for these in the case i am working on are as follows (returns 110.5):
cp25 = 560
cp26 = 570
cp27 = 580
cq25 = .414
cq26 = .479
cq27 = .536
1) how to do this function in VBA only - this is part of a UDF and cannot have any helper cells
2) how to refer to 560,570,580 as a 'range'. is there a way to put these six variables into my ranges for later processing?
All of the google searches i have deal only with linear regression, taking from existing graphs, or say to just use the function i have above.
I have tried
VB:
Var = Application.WorksheetFunction.LinEst(Sheets("references").Range("CP25:CP27"), Sheets("references").Range("CQ25:CQ27^{1,2}"), 1)
[COLOR=#333333][/COLOR]
but return #value! errors. when i remove the ^{1,2} portion, i do return a value but it is incorrect (returns 160), what is the correct syntax for adding in the ^{1,2}? if you do that would be fantastic, but brings me back to issue #2 in that i need to refer to my variables in the vba code and not this range (as they will eventually be going away).
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May 9, 2006
How do I get to see the equation behind Excel Functions? For instance, the
result of pmt() is not making sense to me, I'd like to see what this function
is doing and how it is calculating its value. Trial and Error is rather
time-consuming and tedious.
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Oct 9, 2009
It looks like this (log(X/Y))/log2. The X and Y are celldirections (E2 or F4 and so on). How do i setup that formula in excell?
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Jul 24, 2012
Can I use excel to get make an equation for 4 variables (x,y,z,w)
E.g.
a,b,c,d,3,f,g,h,i, would be constants
w = ax + by + cz + dx^2 + ey^2 + fz^2 + gxy + hyz + iyz
I tried regression but the equation looks like
w = ax + by + cz + c
Is it possible on ay other software e.g MATLAB
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Oct 18, 2007
I have the following formula.
=SUMIF(hfx!A:A,"123456789",hfx!J:J)
very simple.
for the totals in J, if there is a (-) negative number, i would like that excluided from the equation.
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Oct 22, 2008
Lets say I write an equation on my sheet such as:
='A1'!$H422*AH$138
but instead of hard coding the A1 sheet name, I want that to be a value that I can put in a different cell (lets say cell C1) on my same sheet in such a way that it will reference the value in my other cell (Cell C1) and put its value into that equation.
So if I make the value in C1 = A99 then the equation becomes
='A99'!$H422*AH$138
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Mar 20, 2007
i am plotting graphs which i need the equation of the line from. i have been manually typing the x^3, X^2, X^1 and X^0 values into 4 cells which is then used elsewhere, but wanted to know if its possible to get some code to do that for me?
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Nov 20, 2008
Below is a nonlinear model, together with calibration data for which I would like to find the parameters Ro, Kc, a and b.
R = Ro + Kc * (1/(1 + exp(-(a + b*lnC))
Calibration Data
C R
0.00.3347
4.80.4201
7.70.5141
11.20.6177
14.40.6887
Given the calibration data above, how can I calculate or at least estimate these parameters?
I do not want to use an add-in program, like Solver, in Excel. I do, however, want to be able to use any existing functions, if necessary, in Excel. i'd appreciate it if someone can walk me through the steps.
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Jan 13, 2009
The equation is basically: 10^[A/20]+10^[B/20]+10^[C/20]. Now imagine that there is no input value for C. I need to make it so that it won't add the bit I've highlighted in green.
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May 13, 2009
I will like to ask, if there is a way to get in a cell the result of a simple equation without having to copy the contents of that cell with a = in front for example if i have in one cell
15*2+35*4+30/2
in the next cell to display the result
185
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Mar 1, 2007
I need to take a number, multiply it by a precentage, & then round it to the nearest multiple of 5.
ex:
A1=142.5
B2=A1*50%,(then rounded to nearest multiple of 5)
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Aug 6, 2012
if i obtain an eqn by plotting a graph in excel, etc,
y = 1.22952117E-06x3 - 1.08197863E-05x2 + 9.97531712E-01x + 3.99014495E-01
and i wish to subsitube a cell value from another sheet into the 'x' in the above eqn and i need to do this 20 times.
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Mar 18, 2013
I need to move a value to another field (with equation) and use the output for the same equation till limit is reached..
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Jan 11, 2014
How to add an equation to a drop down selection if you take a look at the picture in the link supplied, what I want to do is: I want the calculator to take the number in D12 then if the drop down box under it the selection is (as it is) too high then subtract 50 (k11) from D12 and display the answer in D14. I have listed the 3 drop down choices in column L, Lap 2 I would do exactly the same and so on [URL] .........
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May 20, 2007
I have a cell on ' Sheet 2' with the following formula:
=MAX('Sheet1'!C3:'Sheet1'C10)
ie. it chooses the maximum value from column C between rows 3 and 10 on "Sheet 1".
Lets say the cell reference C10 is now entered into cell B1 on Sheet 2. How do I modify the above formula to reference B1?
I have tried INDIRECT function but can't get it to work.
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May 16, 2008
I am trying to calculate the equation of a curve which best fits some data. On the x-axis is date and y-axis the readings. The curve is quadratic, so on the chart I am fitting a 2nd order polyomial and displaying the equation. To prove that the equation the trendline gives me is reasonable, I am applying the equation on the x parameter to get the y parameter estimate and looking to see the error between predicted and actual - see attached.
The equation and the output from it are clearly rubbish, even though on the graph the trendline is a reasonable fit - see attached. Has anyone any ideas why? I think it has something to do with using a date on the x-axis but no idea why. Is there a way to correct for this? I also tried using the following I to calculate the coefficients which came up with a reasonable forecast (although linest should only be used for linear data): =LINEST(C3:C15,B3:B15^{1,2,3})
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Mar 8, 2014
I have the following 2 formulas that determine the top 2 scores and return the respective headers, but they aren't perfect.
=INDEX(T1:V2,1,MATCH(MAX(T2:V2),T2:V2,0))
The above returns the max, however doesn't take into account scores that are a tie or 0 values
=INDEX(T1:V2,1,MATCH(LARGE(T2:V2,2),T2:V2,0))
The above returns the 2nd highest value, but some instances the output is correct (if there is a tie or a 0).
How can I fix both of these equations and also determine the 3rd highest score?
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Sep 14, 2007
I have two cells (c1 and c2).
c1 contains (2+3*4)*3 without "=" at start.
c2 must contain the result of c1 it means 42.
In the attached file I have a few variants I tried to solve it but they both don't fit.
Formula.xls
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Jan 20, 2014
I'm familiar with 2d graphs, trendlines, and regression equations. Now I have some tabular data that has 2 input variables and a result. As with my 2d data, I would like Excel to create a polynomial equation of z from the x and y inputs. Can Excel do this, or do I need a plug-in or another software package?
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