I was reading an article and it stated something along the lines of (not accurate figures):
Quarter | Stock Index % Change In Quarter Sep 2011 | 5.21 Dec 2011 | 4.69 Mar 2012 | 3.20 June 2012 | -5.30 Sep 2012 | 5.11 Dec 2013 | 1.40
Year to date: 25%
My question is, how would I calculate the percentage change in quarter?
For example if I was to calculate the March 2012 quarter percentage change do I subtract the closing price of the stock market index at March 30th 2012 from the closing price December 30th 2011 divided by the closing value of the index at Dec 30th 2011?
Or should I be using the opening prices (and possibly different dates?)
Secondly, how would I calculate the return ("Year to Date") for this year? Do I take subtract today's closing price from the closing price of 31st Dec 2012?