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lected in the experiment of the five most common types of fibers : cotton fiber , polyester, viscose , silk , wool, in the selection of colors , the most common are: white, black , gray, selected on the count , because the count reached later , mainly for the production of high-grade textiles, uses basically the same, so choose the most common in the current market , and , three kind .

In the experimental data , the impact of the mobility of factors of the fiber there are three main types of factors have five levels ( cotton , polyester, viscose , silk, wool ) , color has three levels ( white, black, gray ) , supporting there are three levels of several ( , , ) , you should choose 45 kinds of fibers tested. But according to the principles of orthogonal test , test conditions can be more strong minority representation in elected pilot program , a small number of pilot programs by the results of these analyzes , we can get more information than the original trial , a representative test. Orthogonal set . Select orthogonal table can be quickly achieved through SPSS software design . See results in Table 1 .

Fiber length of the fiber in the field of migration have some effect , but for live fiber , its mainly from the suspect or the victim scraped or rubbed on clothing under the individual fibers or fiber bundles under hook , in relative terms , it has little in common to follow. So many times the length of the hook pulling experiment values recorded . Table 2. And analyzed for normal distribution , Table 3

Various cases , the fiber probability is high, particularly in the theft , murder , explosions and other cases in which the fiber trace evidence as the probability of continuous improvement , as determined and committed crimes suspects identified role is also rising. Especially in recent years, burglaries at the grassroots level in the proportion of cases is also rising , for example to study cases of theft of fibers in the case of live migration has some representation . This article in burglary cases , for example, select a burglary at the entrance , central location for two suspects must be a place for experiments , the choice of site for the case of a certain representation .

Experimental results of the orthogonal table , in accordance with the conditions of the fiber collection , and placed in the same environment . By orthogonal experimental results , select 1.2 ~ 1.3cm each fiber fiber 30 , housed in the burglary at the entrance ( outdoor ) and burglary central site ( indoor ) two places , and in the one hour , 12 hours, 24 hours remaining number of fibers were recorded , and calculates the fiber mobility . Experimental results are shown in the results section. Table 4 and Table 5.

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