<t>Yes I Know the first difference...But Let me know to show 3 series:a) 1 , 4, 5, 20b) 1, 10, 30, 40c) 1, 25, 40, 80The series are very different...The easy idea is use this ratio(20-1)/4 < (40-1)/4 <(80 -1) /4 I want to use a different method, to select a 2 time series of returns, I use a mean and...

<t>I have these series of numbers:a) 1.4, 2, 2.1, 3.1, 3.2, 4b) 4, 3.2, 3.1, 2.1, 2, 1.4Both series have the same mean and variance...But I like a before b (a it is increasing, and b is decreasing...)What descriptive statistic would you use???I know a) is positive and b) is negative...But what is th...

<t>Hi I am Miguel, from Spain I used to live in London, and now I am taking a master in Finance and quantitative methods in Spain (it is quite cheap and good)I am working in a program more than 5 years that try to get the risk of a portfolio that increase the chance of profits...This program use a l...