Astm D 4855 – 97 (Reapproved 2002) pdf free download

Standard Practice for
Comparing Test Methods1

This standard is issued under the fixed designation D 4855; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This practice provides a procedure for evaluating and
comparing test methods under controlled conditions using the
same materials tested during the same time span. The practice
describes how to obtain and compare estimates on precision,
sensitivity, and bias.

1.2 This practice covers the following topics:
Topic Title Section
Scope 1
Referenced Documents 2
Terminology 3
Significance and Use 4
Requirements for Materials 5
Evaluating Test Methods 6
Sensitivity Criterion 7
Basic Statistical Design 8
Experimental Procedure 9
Procedure for Comparing Precision 10
Evaluating the Bias Between Test Methods 11
Procedure for Comparing Sensitivities 12
Report 13

2. Referenced Documents

2.1 ASTM Standards:
D 123 Terminology Relating to Textiles2
D 2905 Practice for Statements on Number of Specimens
for Textiles2
D 2906 Practice for Statements on Precision and Bias for
E 456 Terminology Relating to Quality and Statistics3

2.2 ASTM Adjuncts:
NOTE 1—Tex-Pac is a group of PC programs on floppy disks, available
through ASTM Headquarters, 100 Barr Harbor Drive, Conshohocken, PA
19428, USA. The calculations for comparing the precision, sensitivity, and
the bias of two test methods can be done using one of these programs and

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