photographs,sketches of the crime,written notes,fingerprints found at the scene,physical evidences gathered,plaster cast,tape of sounds or voices, video tape record of object or sounds,written statements of subject and witnesses,computerized and programed
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no it is a primary data method
It shows primarily that the measurement unit used for recording the data is very large. For example, the standard deviation of the heights of individuals, when recorded in metres, will be one hundredth of the standard deviation of their heights when recorded in centimetres. The process is known as coding.
the best method to collect primary data is to make a Baseline Data or using the method of Rapid Rural Appraisal.
Differing from standard deviations, the coded deviation method finds the mean of grouped data from the assumed mean using unit deviations. This is a shorter way to find the mean.
I could not figure out the math equation. The new data did not fit the existing equation. An equation can be a math formula or standard method.