// chebysheve outlier detection

// this function is used to detect the abnormal value among a set of data

// input:

// delta: a set of data

// flag: discribe which data is already known as outlier

//　　 p: restrict level

// output:

// double[] door : byyond which the data may be considered as a outlier

// door[0]: the upperdoor

// door[1]: the lowerdoor