# Linear Regression Array - Significance Of R Testing

May 5, 2014
I have set up a linear regression array in Excel and now want to test the significance of my r2 value at a certain level of significance. I've only been able to find tables that give the critical r value, but I want to test it at 99.73% level of confidence and none of them contain that specific value. Is there a way to do this in Excel?

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Jul 12, 2012

I have simple data points based on a question that how many people liked product A between 2011 and 2012.

It looks like below

2011 2012

# of Respondents 319 329

% of respondents liking the product 78% 84.5%

The question is: is the increase from 78% to 84.5% statistically significant at either 95% or 99% confidence level. Is it possible to do this basic analysis using Excel?

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Jul 21, 2006

I was handed the attached file. understand everything except how the values in row 6 were derived No formula present when I received the file, just the numbers. Row 7 is hard entered scores the units achieved

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Oct 16, 2008

I would like to run a multiple linear regression in vba. I have one dependent and three explanatory variables. I will have to use a macro of some kind, since I need to run too many regressions to do it manually. To simplify things a little bit:

- There will always be exactly three independent variables

- There are no missing values

- The data is allways numerical

I've already got four ranges defined: Yrange, X1range, X2range, X3range. I would like to take these ranges as input parameters for the regression model. The only two parameters I need are Sum Square for Regression (SSR) and the degrees of freedom. I understand that you can use excel's matrix formulas to calculate some of the input parameters, but one doesn't really get around vba. Any (simple) source code allowing me to conduct a regression with three input parameters?

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Jan 27, 2013

If I have a set of numbers 1,2,3,4,5,6,7,8,9 in cells, how can I get a line of best fit, linear regression, in the cells next to them?

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Mar 2, 2009

I have a set of data. I know how to do linear regression over the whole set of data. How do I have another linear regression over the first 5 points in the set of data on the same graph ?? I am using Excel 2007

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Oct 30, 2006

I am in the unfortunate position of having to run about 900 correlations with Excel as my only option. Normally this would be fine, but in this case, I need the Pearson's test of significance. The only way I know how to obtain this in Excel is through using a regression, which is incredibly time-consuming. Does anyone have a suggestion how to make the best use of time?

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Apr 25, 2014

So I have something like this:

Pre-test || Post-test

45,5 % || 27,3% (<-- percentage of failure)

Is it possible to calculate the statistical significance if have only these two percentages?

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Oct 2, 2008

The above is a screenshot of the data analysis (regression) I want to automate with vba code. Like all macros, I tried to record first and only got the following

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Nov 11, 2008

I have the following dataset and was wondering how I can run a constrained regression in Excel with the constraint being that the total allocation of assets is 100%:

Total return (y): 12 data points

Asset 1 (x1): 12 data points

Asset 2 (x2): 12 data points

Asset 3 (x3): 12 data points

Asset 4 (x4): 12 data points

Asset 5 (x5): 12 data points

Asset 6 (x6): 12 data points

[Attached is a spreadsheet with the actual dataset]

I know the regression equation I need is R = b1X1 + b2X2 + ….+ (1 - b1 - b2 -….- b5 )X6 + e

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Jul 9, 2009

I am wanting to write a macro which uses the excel multiple regression function (a part of the data analysis add-in). I tried recording a macro while I selected the regression function (Tools> Data Analysis... etc.) which produced the following:

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Feb 8, 2007

I am trying to set up the formula y = ax^2 + bx + c. Is there a function for that in excel?

To get a little more into my overall goal. I will have a x constant that will remain the same, but I have 8 different sets of a,b, & c coefficients. So, I would like to set up something like, if a row is labeled A1, find the A1 set of coefficients and use them in the quadratic equation. I was thinking I would need to use a CSE, is that correct?

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Jan 10, 2014

Ok so heres an example workbook:

Book5.xlsx

As you can see from the workbook, each column's amount of numbers depends on the data pulled from an index/match function.

These numbers will change and I want the TREND function to dynamically change with the data.

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Dec 19, 2012

I have one question about the regression. i know how can i do it lineair, exponentiel ... but how can i make a personnalised regression ? for example, if i have i function f(x)=a+b*x^2 or another function ... how can i introduce my function to draw the regression ? i have excel 2007

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Feb 8, 2010

I am trying to do multivariate polynomial regression in excel, trying to correlate data of the form y=f(x1,x2) with second order polynomials:

Y = c + a1*x1 + a2*x1^2 + a3^x1^3 + b1*x2 + b2*x2^2 + b3*x2^3

Using the following command, I have achieved this:

=LINEST(A2:A10,B2:B10^{1,2,3,0,0,0}*C2:C10^{0,0,0, 1,2,3},TRUE,TRUE)

theory Excel uses for this kind of regression?

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Nov 20, 2013

Given 100 samples, to calculate: numbers of hours spent on study is dependent on numbers of hours spent on social networking site.

x (social networking site)

y (study)

x^2

xy

6

4

36

16

24

[Code] .......

SUMMARY OUTPUT

SUMMARY OUTPUT

Regression Statistics

Regression Statistics

Multiple R

0.571423290877713

[Code] ....

So, I've got the coefficient of correlation equals to 0.57, how can I plot my scatter graph?

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Apr 10, 2009

I'm trying to write a macro that will analyze data from one spreadsheet and do a regression. The information I want to be output on the same sheet. I tried to use the record function, but I got an error. It said "Run-time error '1004': ATPVBAEN.XLA could not be found. The code read:

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Feb 10, 2007

need an excel simple formula or function that returns values of y for given x in a two-dimensional array and works in the following way.actually a combination of linear interpolation and lookup/linear search. as in following example

x y

1 10

2 15

3 20

if x=1.5 then y=12.5 (answer available thru FORECAST but incomplete)

if x=2 then y=15 (answer available thru LOOKUP but incomplete)

so for whatever the x i need/get a valid y thru a single formula/method !

sorry m not good in math,

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May 23, 2007

to getting accurate regression coefficients from a dataset with *small* (standard) numbers, which contains centered predictors. More specifically, I have a dataset with 18 observed data points containing a criterion (y), a centered predictor variable (x), another centered predictor variable (z), and the interaction of the two centered predictor variables (xz). This multiple regression equation is structured to test for interactions between the two continuous predictor variables (x and z) as prescribed by Aiken and West (1991) in their classic book.

When I run the regression in Excel with the centered predictors, some of the regression coefficents in the output are estimated to be 0, although they are clealry *not* 0 as estimated by SPSS 14.0.2. I have spent many hours troubleshooting this problem (and searched many forums on the internet) and still do not know why this is happening.

Initially, I thought the problem might have to do with the cross-product of the centered predictors, but even just doing a regression with one of the centered predictors (for certain centered predictors) yields a regression coefficient of 0 (although it should be non-zero as per SPSS 14.0.2). When doing these multiple regressions with non-centered predictors, all regression coefficients are estimated accurately.

I was wondering if anyone had any insights on why I am experiencing these problems.... If anyone wants a sample of some test data I have used to troubleshoot these problems, you can download a file from: [url] and/or email me at (email deleted by Mod) for more datasets or questions.

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Nov 2, 2008

I've currently written the following code to make sure exactly 2 single cell selections are made. But now, I want to extend this code to make sure only cells from rows 5 & 7 are selected and the cells are in the same column.

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Mar 29, 2013

I have to convert the first to the second program, but i don't know how to do this:

MAD.png

ABStolinear.xlsx: the first sheet is the first program which is correct (i think), the second sheet is a failed attempt to write the second program

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Feb 10, 2009

I have 3 equations and have created the relevant chart from them. What I would like to do is put in a value of x & y and get result z. Having done a search through previous threads I found some BiLinear Interpolation code that works using the table in a workbook, but what I'd really like is the Interpolation of the formulae rather than the resulting table and for it to be embedded in VBA.

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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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Oct 4, 2007

In the attached sheet, I have measured data from a device. It shows Input, Output, gain and delta. You can see as input increases, delta comes down. I want to find the output corresponding to delta od -1. In the table, I have enteries for delta of -0.982 then -1.382, not for -1. How to find output corresponding to delta of -1?

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Oct 18, 2013

I have a form that information is entered in. At the end the user can then save the information in a spreadsheet by pressing a command button. The updating to the spreadsheet works, it is the part where the last entry is tested against the info on the form to prevent a duplicate entry that do not work.

I have tested that the program reads the info from the spreadsheet (see the commented lines).

I can attach the whole spreadsheet, but some of the entries on the form are linked to another spreadsheet that make it a bit cumbersome to attach two files.

VB:

Private Sub cmdUpdate_Click()

Dim lRow As Long

Dim ws As Worksheet

Set ws = Worksheets("TonnageInput")

[Code] .....

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Oct 1, 2009

I am trying to write an Excel formula to test if there is data in pairs of cells and if there is I want to copy the entire record to another Excel spreadsheet. Example: if there is data in row 1, column A and data in row 1, Column C or row 1 column D, then copy this record to another spreadsheet; if there is data in row 1 column B and data in column C or column, then copy this record to another spreadsheet. Since there is no data in row 4, column C or column D, this row would not be copied. Row 1, row 2, row 3, and row 7 would be copied to another spreadsheet. The data can be numeric or alpha numeric.

I tried using the ISBLANK statement and can't seem to get this to work properly.

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Feb 18, 2010

This code is functional but very redundant and I figured that has to be an easier way to go about this.

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Jun 30, 2013

I have a program that relies on a remote drive being open and ready. My current tactic (which works perfectly well) is to have a file in the destination drive and ask the date that file was created. If an error occurs I know the destination drive is not ready.

Code:

On Error Resume Next

temp = FileDateTime(destDrive & "xDeletedStuff" & "testFile.txt")

If Err Then

MsgBox "Destination Drive / Folder Not Ready"

Exit Sub

End If

On Error GoTo 0

Idealy I would rather not use the "testFile" I would prefer to just test to see if the folder existed, "destDrive & "xDeletedStuff"

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Jan 29, 2008

I working on a loop that would find blank cell. These cells have a formula in excel, but if certain conditions are met, the cell is left blank. What property in VBA checks for blank cell? I don't thin it's the "empty" property?

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Oct 21, 2006

I have to test if todays day is Saturday. Don't know the syntax.

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