| Popis: |
The precision of Grey–Scale assessment of change in colour is estimated. Allowance was made for any interlaboratory differences, prior to assessment, in carrying out a colour–fastness test, using the prescribed test method, to obtain the specimens. The results show how the assessment precision depends on the Grey–Scale rating. The practical laboratory component of obtaining the tested specimens almost always has better precision than the subsequent assessment. The particular test method used to obtain the specimens can therefore be regarded as having satisfactory precision in practical application. Taking the mean of three assessors results in better precision than that from a single assessment. Assessment precision appears consistent when compared with appropriately transformed older data. |
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