February 25th, 2014, 7:34 am
It has increased, because the rates decreased. If normal vol can be approximated by \sigma * F then in order to have a normal vol at 0.8%-1%, when rates are at 1% you need to have lognormal vol at 100%. That is as simple as that. There must be something wrong either with your calibration or simulation scheme.
Last edited by
pimpel on February 24th, 2014, 11:00 pm, edited 1 time in total.