Standard Deviation and Variance

Hi All,
i have to calculate the standard deviation and variance for two quantities:
Actual and Forecasted (for each of them)
say : actual       forecasted              Variance           Standard Deviation
          3                  18
          5                   6
          3                   5
How do i do that?
Please help me....This is urgent....
Thanks

Hi,
Not sure i understand your question, but if you want to caculcate the percentage deviation of actual from forecasted you'll need to craete a formula in your sturcture and assign it the following calculation:
<actual> % <forecasted> (The operand to use is "Percentage Deviation" and it is located in the Percentage functions)
Calculation of Standard deviation and variance is logical for all values of forecasted and for all values of actual but not for single values.
Hope it helps (if so, please assign points),
Gili

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The data that is being read is an I16 file in a 2 dim array. I need to compute to mean and standard deviation for all the numbers in the array. If I wire this 2 dim array to the input of the "Standard Deviation and Variance" vi function I get a broken wire. I've tried numerous functions to convert the data into a format but I get incorrect answers. I believe I need to convert all the rows and comumns into a series of numbers. There are 128 rows and 128 columns all with different numbers.

I'd suggest you use reshape array, to reshape the 2D array into a 1D array. See the attached LV 7 example.
I basically find the array size of the 2D array, multiply those dimensions sizes together and call reshape array. So, a 128x128 2D array becomes a 16K 1D array.
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Standard deviation in graph (bar chart)

Dear Community,
I am looking for a solution for my measurement analysis software, programmed in LabVIEW 8.5:
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Dear lwo,
You can add two more channels.
One with mittelwert+standardabweichung/2
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Then configure them to show only symbols and no line.
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Message Edited by Stefan Heinzl on 03-09-2009 09:56 AM
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How to calculate standard deviation of a certain number of points?

Hi, I have an application that I acquire force signals and pu then on a array.
I need to calculate the standard deviation and the mean each a certain number of points, 1000 for example.
I'm having problems with this, if you can help me I'd be thankful.
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Solved!
Go to Solution.

So you need something like this?
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
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Std_Deviation.png ‏12 KB

Standard deviation MCXD

Dear all
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if there some setting required plz suggest.

If you run the report and you are seeing something like *** then I suspect it is for the following reason which is provided by SAP in the F1 help if you click on the Cp value field after displaying the report. A
From SAP F1 help:
Note
If there is neither a master inspection characteristic, nor an
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Reg.Standard Deviation

Hi,
I am having following scnario of limits for the MICs
Char Lower Limit Upper Limit s/d-0.02
C 0.08 0.12
in the result recording if the user enters more than the specification system should check with standard deviation and valuation should happen according to standard deviation.
which field i have to use in the quantitative tab,how to solve this.
this varies material to material.
Regards,
Selva.

Hi Selva,
You can use following functionality, which may serve your purpose.
Variable Inspection
Use
In a variable inspection, you must specify at least one tolerance limit in the inspection plan for the quantitative characteristic in question. ISO 3951 serves as a standard for a variable inspection. The Quality Management application component has two valuation procedures for variable inspections:
S-method, single-sided tolerance range
S-method, double-sided tolerance range
When you perform a variable inspection according to the s-method for normally distributed characteristic values, the sample size, mean value (x-bar), and standard deviation (s) of the characteristic values are required as inspection results. Depending on the recording form used, you either enter the statistics, or the system calculates them from the single values.
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Mean > USL - k * s
or
Mean < LSL + k * s
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If the tolerance range is limited on both sides (double-sided), there are two variants for conducting the s-method valuation. You define which variant is used in the function module for the valuation rule. The variants differ in their acceptance range.
When the s-method uses the double-sided tolerance range, both limits of the tolerance range are treated together. The share above the tolerance range and the share below are estimated and compared with a critical value that is calculated from the sample size and acceptance factor. This form of variable inspection leads to the same decision as the graphical procedure described in the ISO 3951 standard (see the figure below). Given the same sampling plan, the acceptance range is smaller than for the variant of the s-method in which the two limit values are handled separately. In this case, the upper and lower specification values are checked separately. The characteristic is rejected when one of the two rejection conditions is met.
Regards
Suhas

Making a Bell Curve in Numbers or MS Office for MAC: I already have mean and standard deviation

I hope my question is a simple one with a simple answer: I have the results of a mid-term and the professor gave us the mean and standard deviation of the results of the exam from which he based our grades. I am a visual person and (to be honest) without having to put forth a lot of effort, I would like to see visually where I fall on this, admittedly, artificial curve. I have both Numbers and MS Office on my MacBook Pro. Is there an easy way to create a bell curve using these numbers? It seems like there should be since those are usually the only numbers needed. I just, honestly, don't want to do the tedious work myself.

Statistical functions including several which deal with normal distribution, are discussed in Chapter 10, Statistical Functions, of the iWork Formulas and Functions User Guide. This useful guide may be downloaded via the Help menu in Numbers '09. Go to chapter 10, or for a direct route, search 'normal distribution'
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What do mean and standard deviation in LAB histogram represent?

I am trying to use Photoshop to obtain numerical data on the colors of a number of images using the LAB colorspace. In this colorspace, the ranges of L, A, and B are 0 to 100, -128 to +127, and -128 to +127, respectively, yet when I view images in this colorspace in Photoshop, the histogram comes up with means that are always positive and in many cases outside these ranges. What do the mean and standard deviation in the Photoshop histogram actually represent?

Each channel still consists of (width in pixels x height in pixels) pixels of values between 0 and 255 (in 8Bit that is).

Query designer and Standard deviation result rows

Hello everyone,
Here is my problem.
I have a key figure for which I do not want any decimals. So in the Number Format : Number of Decimal Places = 0.
I thought the result rows would follow the same rules by not displaying any decimals.
But using the Calculate Result as ... "Standard Deviation", even though my key figure is define with no decimals, the result row displays 5 decimals anyway !
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Edited by: Jean-Baptiste Faubert on Jan 16, 2008 2:56 PM

Hello Jean,
First I would try to unmark flag 'Use default Settings' below Number of Decimal Places in Query Designer.
If this doesn't help you could set Decimal Places in the Provider specific Properties in Key Figure of the MultiProvider used from 'Not defined' to 0.
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But then you have to check other queries where this Key Figure is used.
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Allocating Standard and Variances of Production Costs into CO-PA

Hi Experts,
I would like to ask you about the process of allocating eg. humal labour into CO-PA.
Lets have an example:
We have planned to spend 10 hours on some action. But actually we have spent 20 hours.
When we allocate our time from some PC, we have to allocate actuals, that means 20 hours, which will come into CO-PA online.
At the end of the period we run Production Order Settlement and find the variance.
What will now happen do distinquish between the planned costs and variances?
Thanks in advance for your answers!
Kindly Regards,
Radek

Hi,
I am not really sure about your question
We have planned to spend 10 hours on some action. But actually we have spent 20 hours.
When we allocate our time from some PC, we have to allocate actuals, that means 20 hours, which will come into CO-PA online.
At the end of the period we run Production Order Settlement and find the variance
The 20 hours will only flow to Production order and not to COPA online.
Whatever the difference between the planned actual vlaues in the cost centers, they will come a cost center variance report. It does not effect any where else.
But if there are any balances left out (difference between the total cost collect to the cost centers and the cost obsorbed to production orders etc), this values need to be assessed to COPA using COPA Assessment cycles
I hope i touched your question.
Please do let me know if your question is different. If it is different, please rephrase your question
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Surya

DIAdem Standard Deviation Weighting

I have been doing some data analysis in DIAdem; I have been taking some statistics on some data - working out variance and standard deviation. I asked NI Support team whether 'Population' or 'Sample' weighting is used, as it was not mentioned in the help file. I understand that by default Variance and Standard Deviation are calculated using the 'Sample' rather than 'Population' formula. My company uses Population to work out some of the key performance data of the products we make. At the moment I don't see a way of selecting which formula to use so a little drop down next to the checkboxes so I can pick the type would be great. For now I'm going to have to develop some VBScript or start using excel to do my data analysis. As a footnote to this idea - may I also illustrate that calculating standard deviation directly feeds into process capability (Cp and Cpk). Sample weighting is a little less friendly than Population weighting, so unwitting process control engineers may be finding their processes a little more (I think!) capable than what they truly are.
Regards,
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Is this an idea about DIAdem? There is a separate idea exchange for that.
DIAdem Idea Exchange
I'll ask a moderator to move the idea to there.

Report displaying Material Standard Price and PO Price

Hello Experts
We have materials which are purchased. Price control is maintained as standard price and standard price is maintained using T Code MR21 periodically.
Due to this when PO price is different from standard price maintained in material master (usually PO price is higher than standard price) all price difference are posted to price difference GL at the time of GR.
Now users want to check variations between standard price and PO price for the material receipts.
Can anyone suggest me any report which provides details of standard price and PO price for the material receipts?
Thanks in advance for your help.
Satya Alapati

Nothing std I'm aware of either. You could consider using the messages 06 205/6/7 to get a warning at the time POs are created that price varies significantly from std.
Config help text below:
Set Tolerance Limits for Price Variance
In this step, you define the tolerance limits for price variances.
When processing a purchase order, the system checks whether the effective price of a PO item shows variances compared with the valuation price stored in the material master record. In addition, it checks whether the specified cash discount value is admissible.
Variances are allowed within the framework of tolerance limits. If a variance exceeds a tolerance limit, the system issues a warning or error message.
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Standard settings
The standard SAP System supplied contains the following tolerance keys:
PE Price variance, Purchasing
Tolerance limit for system message no. 207. This message appears if the specified effective price exceeds the predefined tolerances when compared with the material price.
SE Maximum cash discount deduction, Purchasing
Tolerance limit for system message no. 231. This is a warning message, which appears when the specified cash discount percentage exceeds the predefined tolerances.
Note
You can specify whether the system message appears as a warning or error message using the menu options Environment -> Define Attributes of System Messages.
Activities
Maintain the tolerance limits for each tolerance key per company code.
Regards,
Nick

Production order and Variance

Hi,
I need some clarifictions on production order settlement and variance.
Our PP consultant created one PO.Before release of PO they took standard cost estimate it is showing 9000. In this stnadard cost estimate we are calculating the scrap credit also and scrap credit 1000 and we are mainting for cost center also for scrap credit.
while doing of production of settlement we saw that actual amount is 11000.
As per my knowledge When the production order settlement scrap debit also should settle to scrap cost center. Then our scrap cost center will be 0. But everything is settle except scrap and it is not giving any error also. My doubt is whether scrap is settled or does it was clubbed to any other receiver.
One more question. Why we have to settle the order and why we have to run the variance for order. Does it provides any advantage to the management.
Please guide me deeply.
It is very urgent for me.
Thanks in advance

Hi Sateesh
please check the distribution rule for settlement, you may have put 100 (Full) settlemnt for 1st Receiver type say Material
Enev if yo maintained two receiver type in order then also if the first one is Full settlement then system will not able take the second receiver type
I think it is going to your 1st receiver type
Thanks
Ansuman

I need to chart a standard deviation of a moving average in Numbers

In order to complete my statistical analysis of a large ammount of performance data- I was to graph a +/- 2 standard deviation of a moving average AS A SHADED region on my charts. I tried to do this today for Four hours. HELP! PLEASE and thank you SO Much!

You stated:
I have the above charted with the $ values of gains
BUT IT LOOKS LIKE THIS. "
implying it is not correct. Since I don't understand what you are trying to do in general terms I don't know what the problem is.
Can you post some of the data (at least the set you are showing) so we have something to work with?
I made a graph like this:
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We are in the process of activating material ledger and have 2 user
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We are in the process of activating material ledger and have 2 user
requirements that we have not yet been able to complete. First, the
difference between standard cost and weighted average cost needs to be
split between the variance types (raw material purchase price, raw
material usage, packaging price, packaging usage, etc.). Secondly we
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ck13n.
Do you know of any custom developement that might assist us in these
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process to calculate these values ourselves.
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Standard Deviation and Variance

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