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Statistical analysis of detergency tests with a natural soil
Author(s) -
Trowbridge James R.
Publication year - 1970
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02640397
Subject(s) - factorial experiment , statistical analysis , transformation (genetics) , environmental science , factorial analysis , natural (archaeology) , factorial , soil science , chemistry , mathematics , geology , statistics , paleontology , mathematical analysis , biochemistry , gene
Factorial experiments are described for detergency tests using a natural soil. The tests are carried out over several soil‐wash cycles using soil rubbed onto test swatches from the surface of the skin. The significance of the results is increased by removing the variability of soiling among different individuals from the wash treatment totals and by using a log transformation on the original data. Factors investigated include wash water temperature, water hardness, concentration of surface active agent and concentration of builders.