how to find standard deviation in six sigma format?

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SAKSHAM SHRIVASTAVA
评论： Cris LaPierre 2023-8-30
I have plot my data with the help of scater plot. But in data statistics it is only mean and standard deviation. I need my plot which shows 1sigma, 2 sigma , 3sigma how to do that?

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回答（1 个）

Cris LaPierre
Cris LaPierre 2023-8-29
编辑：Cris LaPierre 2023-8-29
Ran in:
The function std returns one standard deviation. Multiply by +/-1, +/-2 and +/-3 to get more than that.
Here's a simple example
% generate a distribution
x = linspace(425,745,200);
y = normpdf(x,580,35);
scatter(x,y)
mu = mean(x)
mu = 585
xline(mu,'g--')
sd = std(x)
sd = 93.0721
xline(mu + sd,'m--')
xline(mu - sd,'m--')
xline(mu + 2*sd,'b:')
xline(mu - 2*sd,'b:')
xline(mu + 3*sd,'k-.')
xline(mu - 3*sd,'k-.')
  2 个评论
SAKSHAM SHRIVASTAVA
SAKSHAM SHRIVASTAVA 2023-8-30
移动：Voss 2023-8-30
I want to plot a scatter curve with mean and sd by import an excel sheet. the code is as follows:
Corrected_UV_D4_spectra_1 = xlsread('corrected_uvd4_spectra_1','sheet1','A21:B341');
data = Corrected_UV_D4_spectra_1;
x = data(:,1);
y = data(:,2);
scatter(x,y)
mu = mean(x)
xline(mu,'g--')
sd = std(x)
xline(data_mean + data_std,'m--')
xline(data_mean - data_std,'m--')
xline(data_mean + 2*data_std,'b:')
xline(data_mean - 2*data_std,'b:')
xline(data_mean + 3*data_std,'k-.')
xline(data_mean - 3*data_std,'k-.')
But plot is now coming
after getting mean and sd in command window i got the error:
warning: Error
occurred while
executing the listener
callback for event
PostUpdate defined for
class
matlab.graphics.primitive.canvas.JavaCanvas:
Dot indexing is not
supported for
variables of this
type.
Error in bfitlisten
Error in bfitlisten
Error in bfitlisten
Error in bfitlisten
Error in bfitlisten
Cris LaPierre
Cris LaPierre 2023-8-30
I can't duplicate the error. Please attach your spreadsheet to your post using the paperclip icon

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