Standard Deviation in Graph

Does anyone know how insert standard deviation into a bar graph??
Thanks.

Ah. The key point that I was missing was that this works (for points or bars) only when the series is selected in the graph. Otherwise the boxes are not enabled.
See also http://discussions.apple.com/thread.jspa?messageID=9256703 for related info.

Similar Messages

Standard deviation in graph (bar chart)

Dear Community,
I am looking for a solution for my measurement analysis software, programmed in LabVIEW 8.5:
I have an array (1D, double) with some data. This data is shown in an graph as a bar chart (attachment 1 & 2).
Aditionally, there is an other array (also 1D, double) with the standard deviation of my data in the upper array (both calculated via standard deviation and variance VI)
How can I integrate this standard deviation in my graph to be shown as (colored) error bars (attachment 3)
Thanks for your help!
Best regards,
Iwo
Attachments:
Graph_in_vi.jpg ‏38 KB
Bar_chart_without_std_dev.jpg ‏853 KB
Bar_chart_std_dev.jpg ‏54 KB

Dear lwo,
You can add two more channels.
One with mittelwert+standardabweichung/2
and one with mittelwert-standardabweichung/2 .
Then configure them to show only symbols and no line.
Color them red and choose a cross as symbol.
Be sure, the mittelwert channel is the first one in the array,
or the bars will hide the crosses.
Best regards,
Stefan Heinzl
Message Edited by Stefan Heinzl on 03-09-2009 09:56 AM
Attachments:
Block Diagram.jpg ‏17 KB
Front Panel.jpg ‏40 KB

Display of standard deviation in graphs

Hello,
I am trying desperately to find out how to present standard deviation within adobe illustrator generated graphs. Can anyone please help me with this problem?
p.s
I am using adobe-illustrator CS2 and winXP
tnx

Dear lwo,
You can add two more channels.
One with mittelwert+standardabweichung/2
and one with mittelwert-standardabweichung/2 .
Then configure them to show only symbols and no line.
Color them red and choose a cross as symbol.
Be sure, the mittelwert channel is the first one in the array,
or the bars will hide the crosses.
Best regards,
Stefan Heinzl
Message Edited by Stefan Heinzl on 03-09-2009 09:56 AM
Attachments:
Block Diagram.jpg ‏17 KB
Front Panel.jpg ‏40 KB

Adding standard deviation bars to graphs

I have composed a bar graph on numbers, and have already calculated the standard deviation of my data. How do I add the standard deviation lines to each bar on my graph? Thank you.

Details available in *_Numbers User Guide_*, page #148 in the English version.
Yvan KOENIG (VALLAURIS, France) lundi 6 décembre 2010 16:44:20

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:
But since I don't really understand what you want I don't know if this is correct or not.
Wayne

Standard Deviation

I was wondering how you get the standard deviation to show up on the graph. I know where the button is to activate the standard deviation for a simple bar chart, however it doesn't show the actual deviation, it gave me uniform for each bar in the chart. How can I fix this? Also I know that the standard deviation isn't the same because I have seen what the chart I am making is supposed to look like.

cgord wrote:
... I know that the standard deviation isn't the same because I have seen what the chart I am making is supposed to look like.
cgord,
The problem is that Numbers doesn't know what your chart is supposed to look like. It's doing the best it can. There is no such thing as a standard deviation for a single point. Numbers considers that your series is a data set and calculates a mean and standard deviation for the set. It then applies this mean and deviation to the error bars, in a proper way, the same for each member of the set.
If your data set is actually a collection of dataset averages, each with a standard deviation of its own, then it might be appropriate to show each bar with it's own custom error bar, calculated elsewhere.
To make this work, you would display each bar's corresponding StdDev in the same row as the mean you are charting and then you would indicate to Numbers which column this custom error bar data is located.
Hope this helps.
Jerry

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.
Thanks
Douglas
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
Attachments:
Std_Deviation.png ‏12 KB

Help on standard deviation please

I am writing a program to find standard deviation. Below is what I have so far "not much I know" but I have tried so don't get flame happy. It errors out and I have tried to fix it. I know the formula for standard deviaition but I can't seem to program it right. I also need to program the code to have three methods the main, an Average method, and a standard deviation method. I know how to make a method but I am having trouble on how to call them. Any help would be appreciated. I am not asking anyone to do my work for me just give me some tips. I would rather take a 0 on the assignement and learn later than turn in someone else's work becaue I will never pass my final if I do that.
import java.text.*;
import javax.swing.*;
class StandardDeviation{
     public static void main(String [] args){
     DecimalFormat df = new DecimalFormat("0.00");
     //Average Code Segment
          double [] values = {10,20,30,4,2}; //Assigns numbers to values
          double valueAverage,square, sum = 0;
          for(int i = 0; i < values.length; i ++){
               sum += values;
          valueAverage = sum / 5; //Computes Average
          System.out.println("Average is: " +valueAverage); //Displays average of values to test to see if it worked
//Deviation Code Segment
for (int i = 0; i < values.length; ++i)
double diff = values - valueAverage;
sum+= diff*diff;
System.out.println(+ Math.sqrt(sum/(values.length - 1))); // here I was trying to test to see if my formula worked
I get the following error
java:20: operator - cannot be applied to double[],double
double diff = values - valueAverage;

Okay this code works. Duffymo can you give me some pointers of writing this code using multiple methods? I can write the methods. I just have a hard time grasping the concept of calling them. I have had a hard time learning this in java. I also looked at some of your past posts on Standard Deviation I see what you are saying about the multiple methods. I know that I need a main method that would probably include the values. Then I would have a average method which would call the values to compute the average. Then I would have the StdDev method to compute the Standard deviation method. Any tips on where to begin on this?
mport java.text.*;
import javax.swing.*;
class StandardDeviation{
     public static void main(String [] args){
     DecimalFormat df = new DecimalFormat("0.00");
     //Average Code Segment
          double [] values = {10,20,30,4,2}; //Assigns numbers to values
          double valueAverage,square, sum = 0;
          for(int i = 0; i < values.length; i ++){
               sum += values;
          valueAverage = sum / 5; //Computes Average
          System.out.println("Average is: " +valueAverage); //Displays average of values
          //return valueAverage;
     //Deviation Code Segment
for (int i = 0; i < values.length; ++i)
double diff = values[i]- valueAverage;
sum+= diff*diff;
System.out.println("The Standard deviation is: "+ df.format(Math.sqrt(sum/(values.length - 1))));

Standard deviation in abap

Dear Freinds,
I want to calculate standard deviation of my internal table columns in abap code , please help me how to calculate it .
Thanks,
Naveen

hi,
try this code for calculating it:-
REPORT abc.
DATA : BEGIN OF itab OCCURS 0,
num TYPE i,
END OF itab.
data : std type p decimals 2.
itab-num = 8. APPEND itab.
itab-num = 25. APPEND itab.
itab-num = 7. APPEND itab.
itab-num = 5. APPEND itab.
itab-num = 8. APPEND itab.
itab-num = 3. APPEND itab.
itab-num = 10. APPEND itab.
itab-num = 12. APPEND itab.
itab-num = 9. APPEND itab.
PERFORM stdev changing std..
write :/ std.
FORM stdev CHANGING std.
DATA : mn TYPE p DECIMALS 2.
DATA : sm TYPE i.
DATA : sm2 TYPE i.
DATA : dev TYPE p DECIMALS 2.
DATA : cnt TYPE i.
LOOP AT itab.
sm = sm + itab-num.
cnt = cnt + 1.
sm2 = sm2 + ( itab-num * itab-num ).
ENDLOOP.
mn = sm / cnt.
dev = ( sm2 - ( ( ( sm * sm ) / cnt ) ) ) / ( cnt - 1 ) .
dev = SQRT( dev ).
std = dev.
ENDFORM. "stdev
Edited by: ricx .s on May 2, 2009 1:50 PM
Edited by: ricx .s on May 2, 2009 1:51 PM

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'
For what it's worth, you can find the formula for calculating the coordinates for the bell curve here: The-Normal-Distribution-Or-Bell-Curve
Regards,
Barry

Is there a way to find a rolling standard deviation?

Hello,
I am currently taking a large amount of data points, and recording 1 out of every 1000 points to a spreadsheet, and saving the latest 1000 points taken to record to a spreadsheet when the program has finished. I would like to be able to know the overall standard deviation of all the points (approximately 36000000 data points, of which I will only record 36000), but I will not be saving all the data points. Is there a way to approximate the standard deviation (of all the points, not just the ones I record)?
I know that I can find the exact mean by continuously summing and then dividing by the number of points taken. I also know that if the mean remains constant, I can start with a standard deviation, find the sum of the residuals squared, and add the new residual for each data point. The problem is that the mean is changing, so each time a new data point is added, the residuals for all the earlier points are also changed.
I'm sorry if this is more of a math problem than a coding issue, but I thought perhaps there would be a way to approximate it in LabVIEW.
Thanks
Solved!
Go to Solution.

Broken Arrow wrote:
What about the Point by Point SD VI?
Well, that's exactly what the OP did not want...
(quote: I would like to be able to know the overall standard deviation of all the points (approximately 36000000 data points, of which I will only record 36000), but I will not be saving all the data points. Is there a way to approximate the standard deviation (of all the points, not just the ones I record)?)
However, you can use the standard_deviation_ptbypt to get the global value without much memory impact by setting the sample lenght to zero.
Of course my example can be futher simplified as attached. (The earlier version was a verbatim translation of the article). Modify as needed. I also added the ptbypt version. You can look at the code of the ptbypt version, it's quite similar (look for the "infinite horizon" case). Personally, I prefer to use a size=3 array instead of multiple scalar shift registers.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
RunningSD1.vi ‏31 KB

How to wire input to "Standard deviation & Variance VI"

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.
Brian
Attachments:
2D_Mean.vi ‏26 KB

Curve fitting: Taking standard deviation into account

Hi,
Using LabView and Curvefitting. Following situation:
I have 15points including their standard deviation. I also have set up my curvefitting with my individual gaussian fitting. Basically the fitting looks good.
But how can i tell labview to take care about my already calculated standard deviation.
I always compare it with my OriginPro fitting (same gaussian equation). If I only take my data X and Y I get the same results.
But when I also indicate my standard deviation (in Origin), meaning X, Y and +-Y I get a more realistic result.
And that is what I would like to do with LabView aswell but there is no possibility to take my +-Y in account, isn't it?
(And no, the Origin VIs for LabView do not offer me this aswell. At least I don't see it )
Anyone a hint?
Thanks in advance
Solved!
Go to Solution.

altenbach wrote:
What is the "CurveFitting SubVi"?
sorry, meaning CurveFitting Express.vi
I have an equation like: a+b*10^(-c*(x-x0)^2)
a, b are offsets. x0 is the center of my gaussian curve. and i'm interested in c which describes the width of the gaussian function.
please have a look to the attached file:
- the red dots are mmy data plus the standard deviation (white dots)
- the green fitting curve is labview using the CurveFittingExpress
- the yellow fitting curve is using LabView Non-Linear Fitting with weigthing
- the blue fitting curve is the output I get using OriginPro. As you could see Origin is the only one taking care about the points at the edge (fitting inside the standard deviation)
that means in terms of c:
labview: 0.089
origin: 0.053
x0 is kinda similar. a,b, are different.
that's it.
Attachments:
Capture.PNG ‏58 KB

Does anyone know how LabView determines standard deviation on their Gaussian Peak Fit VI?

The VI reports standard deviation that is quite high. I am wondering if they go out to 5-sigma or something along those lines.
If anyone has had this same issue, please let me know
Thanks in advance!

Interesting you mention the robustness of the algorithm. I have heard in the past that it is not very good. In fact, the data you feed into it must be VERY Gaussian otherwise the fit is just garbage. Luckily for me, my data is quite clean, see the attached picture.
You also mention Levenberg-Marquardt. Is a VI available somewhere or would I need to write my own?
Thanks for your prompt reply!
Attachments:
GaussFitAttachment.docx ‏26 KB

Help with standard deviation assignment

I am having trouble with the std deviation portion of one of my assignments. Plus, only 5 test scored will print, not all 6. Could you please take a look and see what I am doing wrong? Is there a way to add the find the std dev. and mean for each semester?
----------------------Start Code------------------------------
public class Main {
    int grades[][]={{15,20,15,20,15,20},
    {14,21,14,21,14,21},{13,22,13,22,13},
    {14,21,14,21,14,21},{15,20,15,20,15}};
    int students, tests;
    String output;
    /** Creates a new instance of Main */
    public Main() {
     * @param args the command line arguments
    public static void main(String[] args) {
        Main m = new Main();
        m.students = m.grades.length;
        m.tests = m.grades[0].length;
        m.output = "The scores are:\n";
        m.buildString();
        m.output += "\nMean:       " + m.mean();
// +                "\nStd Dev:   " + m.StdDev() + "\n";
        System.out.print(m.output);
    public String mean(){
        double mean = 0;
        String outputMean = "";
        for (int column = 0; column < students; column++){
        int sumOfGrades = 0;
            for (int row = 0; row < students; row++){
                sumOfGrades += grades[row][column];
            mean = sumOfGrades/students;
            outputMean += mean + "   ";
        return outputMean;
//    public double StdDev(){
//        Main m = new Main();
//        int sumOfGrades = 0;
//        double StdDev = 0;
//        for (int column = 0; column < students; column++){
//            for (int row = 0; row < students; row++){
//                sumOfGrades += Math.pow((grades[row][column]-mean()), 2);
//            StdDev = Math.sqrt(mean/students) + "   ";
//        return StdDev;
    public void buildString(){
        output += "           |       Fall        |       Spring       |\n";
        output += "           ";
        for (int counter = 0; counter < tests; counter++)
            output += "Test " + (counter + 1) + " ";
        for (int row = 0; row < students; row++){
            output += "\nStudent(" + (row + 1) + ")   ";
            for (int column = 0; column < tests -1; column++)
                output += grades[row][column] + "     ";
----------------------end code-----------------------------
------------------ Displays----------------
The scores are:
           |       Fall        |       Spring       |
           Test 1 Test 2 Test 3 Test 4 Test 5 Test 6
Student(1)   15     20     15     20     15
Student(2)   14     21     14     21     14
Student(3)   13     22     13     22     13
Student(4)   14     21     14     21     14
Student(5)   15     20     15     20     15
Mean:       14.0   20.0   14.0   20.0   14.0
-----------------end displays----------------

What I was thinking was that mean() would be a lot more useful if
(1) you passed it an argument saying what test you were interested in. This would
take the place of "column" in your code.
(2) it returned a double value which was the mean of the given test. The snippet you
posted is OK, except that it should return a double not an int. Ie it should look like:    /** Returns the mean for a given test. */
public double mean(int column) {
    double mean = 0.0;
    // do calculation
    return mean;
}Of course if you do this you will have to change how mean() is used from within main().
Instead of a simple "m.output += "\nMean: " + m.mean();" you will need a loop:    // start the string
m.output += "\nMean: ";
for(int ndx = 0; ndx < tests; ++ndx) {
        // append each mean
    m.output += " " + mean(ndx);
}The standard deviation method will be very similar to the mean() one, and
used in a similar way:    /** Returns the sd for a given test. */
public double mean(int column) {
    double sd = 0.0;
    // do calculation based on what was posted,
    // or what you have been told to do.
    return sd;
}

Standard Deviation in Graph

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