What is a least square line? - Metrology & Quality Control

Q.  What is a least square line?
- Published on 07 Aug 15

a. A line which has sum of errors minimum
b. A line which has sum of difference of errors minimum
c. A line which has sum of squares of errors minimum
d. None of the above

ANSWER: A line which has sum of squares of errors minimum

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    Discussion

  • Sravanthi   -Posted on 23 Oct 15
    - The line for which sum of squares of errors is minimum is called as least square line. This is used to measure straightness of a surface.

    - If autocollimator method is used to determine straightness of a surface. Maximum deviation is obtained by joining first and last positions obtained and the profile for the measured surface is obtained.

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