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I am a little confused about something similar to your question… I failed L1 band 9 Dec 2013 and studying now for dec 2014…
Last years material showed the equation as ={ (-modified duration x change in spread)+(convexity x (change in spread)^2)} x100.
Now this year it requires convexity to be multiplied by 1/2…. Can anyone comment as to why that is?
With all the changes to FI this year, it seems like they decided to go into much more detail on L1 FI material than they have in the past… :