
Originally Posted by
Spectator
Q,
Certainly, one of the things I am saying is that the data needs to be treated differently, depending whether it is pre May 2006 or not.
I am not arguing that additions are anything other than Porting (the majority) or PWMB (less at the moment).
Maybe if I try to illustrate my point with real figures from the Inventory it would be clearer.
Let's start with months that were not Current during Oct-Dec 2010 (May 2006 (except for 7 days) to August 2007, since I don't think we disagree on those. I'll choose a range that has positive and negative differences.
Month/Year --- Oct 2010 --- Jan 2011 --- Diff
Apr 2007 ------ 1,370 ------ 1,420 ------ 50
May 2007 ------ 1,123 ------ 1,070 ----- (53)
Jun 2007 ------ 1,307 ------ 1,272 ----- (35)
Jul 2007 ------ 1,518 ------ 1,673 ----- 155
Aug 2007 -------- 202 --------- 95 ---- (107)
Since there has been an increase in April and July, these must represent new cases that weren't present in the October Inventory.
In May, June and August, since the dates aren't Current, the reductions must be due to Withdrawals/Denials.
So the real change to the Inventory is the sum of the values +10.
Even in this case, for the purpose of counting NEW applications for Porting purposes, reductions should be ignored - there are 205 new applications - the reductions only help how far the PD might advance.
Now let's look at some months that were Current in the period Oct-Dec 2010. Those are months before May 2006.
Month/Year --- Oct 2010 --- Jan 2011 --- Diff
Jan 2004 --------- 21 --------- 15 ------ (6)
Feb 2004 ---------- 7 --------- 13 ------- 6
Mar 2004 --------- 33 --------- 20 ----- (13)
Apr 2004 --------- 13 --------- 20 ------- 7
May 2004 --------- 22 --------- 19 ------ (3)
Again, since there has been an increase in February and April, these must represent new cases, which weren't present in the October Inventory.
For reductions in January, March and May, these are most probably due to approvals in October to December 2010, since those PDs were Current. They would therefore have been present in the October Inventory and don't represent a change involving new applications. They will be counted when we add on the approvals during Oct-Dec (757) later. If we include the reduction now, it will net off from within the 757 figure to zero and effectively reduce 757 to 735.
Thus, the real difference becomes:
Jan 2004 --------- 0
Feb 2004 ---------- 6
Mar 2004 --------- 0
Apr 2004 --------- 7
May 2004 --------- 0
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and the real difference between the Inventories is +13 rather than the -9 that would be calculated using all the figures.
Thus (and I know these aren't the correct figures), if approvals were 100 in Dec-Oct, then with the net addition of 13, Porting would be 113, rather than 91 if the reduction due to approvals is accounted for.
The difference in how different date ranges are treated might only be important to me, since I use the results to derive a new October 2010 Inventory figure starting point for my calculations. Conceivably and probably, it doesn't affect how you derive your figures for overall movement throughout the year.
But the point about only counting additions stands for calculation of Porting.
To use an analogy:
If there are 5 women in a room at the beginning (the October Inventory) and then over a period of time (Oct-Dec) 12 men enter the room (new applications), but the 5 women leave (are approved) it doesn't alter the fact that 12 men are in the room. You can't say that there are only 7 men because 5 women left.
I'll probably get into trouble for using men and women in the analogy, but there is no intent to offend.
That's the best I can do. If that's not good enough, let's just leave it be.