Mathematics - Power Trend Lines?
Jan 23, 2014
I am trying to fit a cooling graph with a trendline and I have found the power line to fit the best, as well as corresponding with Newton's law of cooling. However, I am not savvy enough to discuss how similar or dissimilar the two equations are!
the resulting equations from two different curves are as follows:
y=4305 x^-0.87733
y=4025 x^-0.91004
both fits have an R^2 of 0.996.
I am analyzing two scenarios of cooling the same object with three variables, one intended (the extraction of energy using water flow in one case, and no extraction in the other) and the others not under my control: different starting temperatures and different ambient temperatures. I need to understand if these are generally the same curve, or how very different are they? is there any statistical way to represent their relationship?
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Apr 3, 2012
Is it possible to put in Trend Lines when creating a stacked column chart?
I've tried in Excel 2003 and 2010 but it doesn't appear that it is possible.
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Jun 28, 2014
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Dec 10, 2008
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Jun 27, 2006
im building a fairly intricate workbook at the minute but it is starting to slow down significantly lately as ive added more fromula's and sheets. I was hoping to make it even bigger but it looks like i might be stoped in my tracks. I have a reasonaby powerful computer and excel 2003. Does anyone know a way i could increase the capacity of this one particular workbook as it will be used by many people to enter data daily.
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Mar 12, 2009
To find the power ( i.e. ^ n) when you have other variables.
Mathematical Perspective as well as through EXCEL..
Ex: 5^n = 125
We know that 5^3 = 125,
Now if I have been given the value 5 and 125 , then how do i get the answer 3 ( i.e ^ n) value...
I need to solve a slightly complex issue and therefore need help for the above requirement as well as to get the "n" value..
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Jan 12, 2010
I am trying to do a nested if formula but I can't get it to work.
The condition is: If value in cell R5 >0 then get the value in cel X29 on power 4.
=IF(R5>0,POWER(X29,4)
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Jul 14, 2002
how can I type numbers to the power of something Say 12 to the power of 3. I want the 3 to be smaller and up off the line is that possible
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Apr 25, 2008
I have a question about coping table from exel into ppt, is this posible or not,
PS: i just need to copy a specific range of cells ex. A1 g17 into a slide in pp.
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Feb 23, 2009
I am trying to write a routine (via two comboboxes) that will enable users to select a choice of charts from one of three possible worksheets and have the charts on the selected sheet copied to PowerPoint. My difficulties are these:
a. I cannot determine how to pass the selections to Excel (see b. as well)
b. In some instances my charts are actually groups of a chart and a picture. how I should reference these? They are obviously not ChartObjects: when I use the macro recorder all I get is a range.
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Aug 8, 2006
I have a string of n pairs and want to check various combination of that string.
Example: Pairs 58 78 15
Since I know I have 3 pairs (but it can be 2 or 4), I know the number of combination I want to test, ie 2 power 3 = 8 combinations. How can I program a code creating the various strings, ie 587815, 587851, 588715, 588751, 857815, 857851, 858715, 858751 ?
This is what I have so far (not much):
Public unique_pair 'number of pairs provided by another macro
Public mystring 'provided by another macro
Sub make_guess()
Dim number_of_combination, i
number_of_combination = 0
number_of_combination = 2 ^ unique_pair
For k = 1 To number_of_combination
'how to generate the various string ????
Next k
End Sub
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Jul 30, 2014
I have created a Power Pivot Chart with Stacked Column chart. Made one axis as Secondary Axis and the axis is Clustered Column, but it is overlapped with Stacked bars.
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Jul 10, 2014
I've been trying to get power query to search a list of parcel numbers on an assessor site: [URL]. The problem I'm getting, every time you put in a different parcel number, you get the same URL for the results. I want to extract just a few pieces of information for each parcel search, but I can't initiate a search through excel. I'm thinking the problem is in the Data source settings. How can just get it to show me the assessors page results for a single parcel search in excel?
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Oct 7, 2008
I need to be able to send my selected range of cells (to include: the spreadsheet background, colored cells and all values contained) to Power Point for a daily product. I found this great VBA online and would like to use it but the problem is I keep getting funny results. It doesn't matter what cells I select I keep getting a extra margin on the left side and top of the pasted product in power point. I then have to crop the results... I have looked at the macro (from my noodie eyes) and cannot seem to find a way to adjust this added on margin.
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Oct 16, 2009
I am using the following code to Open a presentation, and run a macro. Everything works fine, but I would like it also to Save the presentation and Close it.
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Apr 28, 2007
how to suspend/hibernate some specific sheets in one workbook , to free cpu power?
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Jun 3, 2007
i would like to write vba to fill a "chess Board" Matrix (8X8) With Powers Of 2...
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(i suppose, click a button/icon and have the numbers fill in/populate...)
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Feb 21, 2012
Have a system that runs 8 monitors on one computer. 4 are very large screens. Creates a lot of heat and uses much power.
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Just want to dim screens with a macro, then undim it. Don't need to have it linked to the mouse movement, but that might be nice too.
I tried a macro that said "Dim MyScreens" but nothing happened.
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Jun 25, 2009
Is it possible to modify the windows power settings in excel vba. I have this example, but it doesn't do anything.
Sub testPOWERCFG()
CreateObject("WScript.Shell").Run "POWERCFG /CREATE Custom1", 0, False
CreateObject("WScript.Shell").Run "POWERCFG /CHANGE Custom1 /monitor-timeout-ac 15", 0, False
CreateObject("WScript.Shell").Run "POWERCFG /CHANGE Custom1 /monitor-timeout-dc 10", 0, False
CreateObject("WScript.Shell").Run "POWERCFG /SETACTIVE Custom1", 0, False
End Sub
I need some code to create and activate a scheme whereby everything is on and also some code to revert back to the default settings on the machine.
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Apr 17, 2014
Using Excel 2013.
Trying to create a Calculated Column in a table to put Expense in 1 of 4 categories
I came up with =CALCULATE(sum([TotalExpense]),FILTER(factExpense,factExpense[ExpnseType]="Sundries"))
But that is returning total instead of a total for each record What did I miss?
This works for the first Calculated column: =CALCULATE(sum([TotalExpense]),FILTER(dimExpense,dimExpense[Type]="Sundries"))
But as soon as I copy the formula to the next column and update the type to "Wines_Spirits" I get
A circular dependency was detected
Found the answer on SQLBI website I added a unique id to each row and in Table Behavior in the Data Model set the Unique_ID as the Row_Identifier
[URL]
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Jan 6, 2009
I have two columns where TREND does not work well. I want to calculate the TREND value of Column 2 (PERCENTILE RANK) based on a new RAW number. If I TREND between just the two rows, the value is fine (i.e. If I TREND between 105 and 110 RAW, I get the right PERCENTILE RANK if the new X value is 106 (which is 15.3% PERCENTILE RANK). How can I make a formula that will only look at the two rows and TREND just those two rows to give me the right PERCENTILE RANK.
RAW PERCENTILE RANK
10514
11020.4
11121.8
11729.5
11833
12342.5
12444.5
12954.4...........
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Apr 21, 2014
Using Excel 2013.
I am trying to get DistinctCount from a field if another field in the same table is greater than zero.
PowerPivot DAX -COUNTIF
[Code] .....
The count returned includes all not just values greater than zero. How can I get just values greater than zero?
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Apr 24, 2014
I want to create a report using power pivot while creating the relationship between the linked tables, power pivot is throwing error "The relationship cannot be created because each cilumn contains duplicate values. Select at least one column that contains only values"
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Mar 8, 2013
I need to have all of my number be "x10^-6", but Excel wants to make them, for instance, 7.66x10^-3, when I need it to read "7660x10^-6". How can I force excel to do this?
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Apr 2, 2009
I'm trying to figure out how to do seasonal forecasting based on volumes. I tried to use FORECAST but the numbers are not accurate.
I have actual data to work with to come up with my forecasting on a monthly basis. Our yearly calender is from Nov 08 to Oct 09.
Here's a sample of the data....
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Jan 12, 2010
I have a simple x y scatter graph, to which i have a trend line running through it, fine.
what i need to do is fine some values according to that trend line. e.g. my X axis goes up to 60 and my Y axis goes to 10, so if i draw accross at 55 from the trend line, i then go down to a number on my Y axis.
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Dec 14, 2008
What I have is a column (column A) that only has two data entries at any one time.
I need column B to fill in the trend of those two data points.
My problem is I don't know how to deal with the cells that say #N/A. Which is every cell other than the two cells with data.
If I replace the #N/As with say 1, then it messes up the trend data points.
It seems like I need to be using the trend command, but any solution would be welcome.
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Nov 23, 2011
When using the Trend function, I can get the value for individual future periods. I then can get a total for the year by summing each individual future period.
What I don't know how to do is sum them all using one formula. For instance, If I know the values of periods 1-5, how would I write a formula that would sum the future values (in one cell) of periods 6-12 -- without having to sum each future period individually?
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Aug 5, 2008
1. I use a number of x,y pairs
2. From x,y pairs I produce "scatter" type chart
3. From the chart I get trend line and its equation e.g. 5-order polinominal
4. I convert equation into excel formula
5. I apply formula onto the same range of x argument and produce graph
6. The graph is very much different from the trend line!!! I would expect exact match as I use equation/formula for the trend line.
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Sep 6, 2006
I am trying to use VBA to find a value on a trendline. I have been unable to call the TREND function from Excel, and I can't see what I'm doing wrong. I'm using the following line of
point25 = WorksheetFunction.TREND( Range("d2:d25"), Range("c2:c25"), 25)
I keep getting "Runtime error 1004 - Unable to get the Trend property of the WorksheetFunction class".
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