Title:
STANDARD DEVIATION ESTIMATING RULER FOR NORMAL PROBABILITY PAPER
Document Type and Number:
Japanese Patent JP3129269
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To make the estimating work quicker, and reduce a probability for a wrong estimation by a method wherein a reading frequency is reduced, and also, calculations are eliminated in the estimation of standard deviation values using a normal probability paper.
SOLUTION: This ruler has an equal space graduation part 11, a variable part 13 and a vertical fixed axis 12, and when the analysis of data is performed by using a normal probability paper or a similar probability paper using a distribution function wherein the longitudinal axis is a normal distribution, a regression line which is drawn on the probability paper is made to meet the variable part 13 of the ruler, and the value of a standard deviation is read by a cross point between the equal space graduation part 11 and the variable part 13 or the like of the ruler.
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Inventors:
Harumi Shimomura
Application Number:
JP36279997A
Publication Date:
January 29, 2001
Filing Date:
December 12, 1997
Export Citation:
Assignee:
NEC
International Classes:
B43L13/20; B43L7/027; G06G1/04; (IPC1-7): B43L7/027; G06G1/04
Domestic Patent References:
| JP4944920B1 |
Attorney, Agent or Firm:
Asamichi Kato
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