Deviation, Average: 



Deviation, Standard: 

 Discrepancy: 

 Displacement : 



Displacement, Temperature: 



Displacement, Depth: 



Distortion : 



Distribution, Gaussian or 

 Normal: 



Down Trace: 

 Drifting Station: 

 D.S.P: 



The Arithmetic mean of the deviations of a series of meas- 

 urements of equal weight taken without regard to sign. The 

 sum of the absolute values of deviations divided by the total 

 number of deviations. 



The square root of the following quantity: the sum of the 

 squares of the deviations of a series of measurements di- 

 vided by the total number of deviations. 



The mathematical difference between two measurements of 

 the same conditions, these measurements being taken si- 

 multaneously by two different measuring instruments. 



Translation of the origin of a set of coordinates; the dif- 

 ference, both in magnitude and direction, between the origins 

 of two or more coordinate systems. Specifically, the displace- 

 ment of a BTgm is the amount that the BT curve lies to 

 the right or left of, up or down from a reference curve, or 

 reference point. This displacement can be caused by sets in 

 the instrument, can represent correction factors, comparisons 

 between curves, etc. 



Translation of the origin of a coordinate system of tempera- 

 ture versus depth, such displacement occurring in the di- 

 rection of temperature. 



Translation of the origin of a coordinate system, temperature 

 versus depth, such displacement occurring in the direction of 

 depth. 



Change in the characteristic shape of the BT trace in any 

 one portion not attributable to true ocean condition, but such 

 change being caused by erroneous measurements, faulty in- 

 strument, or poor averaging technique. 



A measure of the occurrence of accidental errors in a series 



of measurements of the same degree of precision. The mathe- 

 matical treatment is based on three axioms: 



(1) Small errors are more frequent than lai'ge ones, and 

 the probability of occurrence of an error is a function of 

 its size. 



(2) Positive and negative errors of the same size are about 

 equal in number. 



(3) Accidental errors of large magnitude do not occur. 



See Trace, Down. 

 See Anchor Station. 

 See Correction Factors. 



Error : 



A class of deviations which describe the absolute or prob- 

 able limits of reliability of a single measurement or a group 

 of measurements. The term is too general for quantitative 

 evaluation, since there are many kinds of errors. Generally 

 the term error is used when in actuality the term indetermi- 

 nate error should be used. Hence the more specific meaning 

 is understood in the use of the more general term. 



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