Standard Deviation Calculation

Use the SD mode for standard deviation calculations.

Always make sure you clear statistical memory by [ 2nd ] [ Scl ] before preforming standard deviation calculation.

Individual data can be input using [ DT ] ; To delete data you just input, please press [ 2nd ] [ CL ]. Multiple data of the same value

can be input using [ 2nd ] [ ]. For example, to input the data 15 seven times, press 15 [ 2nd ] [ ] 7 [ DT ].

The values of the statistical variables depend on the data you in- put. You can recall them by the key operations shown in the below table. See Example 41.

 

[ RCL ] + [

A

]

_

_

 

x

[ 2nd ] + [ x ]

 

 

 

 

 

 

 

[ RCL ] + [

B

]

Xσn

[ 2nd ] + [ Xσn ]

 

 

 

 

 

 

n

[ RCL ] + [

C

]

Xσn-1

[ 2nd ] + [ Xσn-1]

 

 

 

 

 

 

Regression Calculation

Use the REG mode for regression calculations.

Press [ MODE ] 3 to enter the REG menu and then choose one of the six regression types by pressing the corresponding argument value, as follow :

Lin Log Exp

[]

⎯⎯⎯→

1 2 3

[]

 

←⎯⎯⎯

Lin Linear Regression

Log Logarithmic Regression

Exp Exponential Regression

Pwr Power Regression

Inv Inverse Regression

Quad Quadratic Regression

Pwr Inv Quad 1 2 3

y = A + B x

y = A + B lnx y = A • e Bx y = A • x B

y = A +

y = A + B x + C x 2

Always make sure you clear statistical memory by [ 2nd ] [ Scl ] before preforming regression calculation.

Individual data can be input using [ DT ] ; To delete data you just input, please press [ 2nd ] [ CL ]. Multiple data of the same value

can be input using [ 2nd ] [ ]. For example, to input the data 40 and 55 ten times, press 40 [] 55 [ 2nd ] [] 10 [ DT ].

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Citizen SR-270N manual Standard Deviation Calculation, Regression Calculation