Getting previous quarters

[#1]

Hi All,

Just want to ask how I can achieve getting the sum of previous quarters. Let's say I have the ff. data.

Year	Qtr-Year	Source	Qty
2013	201303	B	21312
2013	201304	A	21312
2014	201401	A	32
2014	201401	A	43
2014	201401	A	24
2014	201401	B	55
2014	201401	B	6556
2014	201402	B	21
2014	201402	A	312
2014	201402	A	445
2014	201402	B	5
2014	201402	B	7568
2014	201403	A	79
2014	201403	A	7878
2014	201403	B	23432
2014	201403	A	324
2014	201403	B	32
2014	201403	B	42
2014	201404	A	23432
2014	201404	A	423

I need to get all the sum of qty where source = A. I need to output in a table the sum({<source A>}qty) - previous sum({<source A>}Qty) / previous sum({<source A>}Qty) .

As much as possible I want to implement this in the script as I do not want to use column() in the table.

Thanks,

Lyn

[danieloberbilli · Accepted solution]

Maybe something like this: (see qvw attached for script part)

[#3]

Hi,

Yes this is what i'm looking for. although I have a question. Is previous() the one I should use to look for the previous quarters? Thank you

[danieloberbilli]

Yes, but only in this example: note that I first sorted the table ascending by Qtr-Year, then I avoided the first row for the calculation and for the rest used the previous expression