question on Loss reserve testing - report year approach

[teddybear]

For those who have read - "Loss Reserve Testing - a report year approach" by Fisher and Lange, can you show me how to calculate the "Average % increase in Claim cost (exponential)"( which is on table 4 of Page 196) ?

The similar problem on All 10 page 97 sample question 1.

It is said that "fit the data into exponential curve", but I had difficulty figuring it out.

Thanks.

[Basso]

best way to do that is to use the BA II Plus (I think there's another legal one that works too) to calculate the regression curve for you.

[Mary Frances]

Take lns of the data points and fit a line. Then your fitted points are
exp(fitted linear points)