TABLE 28 



PRECISION OF MEASUREMENT CODE 



Columns 37 and k-2 may be used for entry of a precision of measurement 

 code. See table below. Provisions under which the originator may enter 

 the precision of measurement code are as follows : 



1. Temperature and/or salinity are reported to the hundredths place 

 only. 



2. A "cruise measurement error" has been computed and is entered in 

 the general remarks space of the coding form. The "cruise measurement 

 error" is defined as the standard deviation of the differences between all 

 duplicate determinations or paired thermometer readings obtained for the 

 cruise (or specific groups of stations of the cruise. ) This parameter may 

 also be given (for future inclusion on the cruise master card now being 

 developed) even though no individual precision of measurement codes are 

 given at individual observed levels. 



3. The doubtful data entry (?) is given precedence over the precision 

 code entry. 



k. No precision of measurement entry should be coded at individual 

 levels where the difference is equal to or less than the "cruise measure- 

 ment error." For example, if the "cruise measurement error" for salinity 

 is + 0.018 %o, no precision code entry should be made for determination 

 differences of 0.018^ or less; in this example, the first permissible 

 precision of measurement "entry" would be D. 



Difference of Difference of 



Paired Thermometers (°C. ) Dual Salinity Measurements (^) Code 



.01 

 .02 

 .03 

 .Ok 



.05 

 .06 



.07 

 .08 

 .09 



.10 



.11 



.12 



.13 



.14 or > .14 



NOTE: Thousandth place should be truncated, not rounded (i.e., 0.010 through 

 0.019 = 0.01) before determining code. 



77 



