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Forum: General Actuarial 11-12-2018, 11:09 AM
Replies: 510
Views: 50,820
Posted By Abraham Weishaus
Some people voted on paper ballots. With the...

Some people voted on paper ballots. With the postal holiday today, it will take time for them to receive and tally all the votes.
Forum: General Actuarial 11-11-2018, 03:56 PM
Replies: 510
Views: 50,820
Posted By Abraham Weishaus
But there is another key word: "preserved". If...

But there is another key word: "preserved". If the Academy feels that the proper role of members is to not have any say in the bylaws, that is not the current situation - it is a change to the...
Forum: Long-Term Actuarial Math 11-04-2018, 06:48 PM
Replies: 568
Views: 92,692
Posted By Abraham Weishaus
The textbook has just one line on this (page 5): ...

The textbook has just one line on this (page 5):
"This avoids the problem that older lives may be less able to pay the premiums."


I don't know whether your #2 qualifies for credit; certainly...
Forum: MAS-I 10-29-2018, 10:03 PM
Replies: 509
Views: 77,984
Posted By Abraham Weishaus
I don't think that is true either. ...

I don't think that is true either.

Actually he doesn't refer to the variance of beta_j in the two-variable model at all.

And I doubt it does even that. Typically, adding more variables to...
Forum: MAS-I 10-29-2018, 09:58 PM
Replies: 509
Views: 77,984
Posted By Abraham Weishaus
Why? The correlogram shows there's a trend, but...

Why? The correlogram shows there's a trend, but we can't conclude whether it is positive or negative.
Forum: MAS-I 10-28-2018, 07:57 PM
Replies: 509
Views: 77,984
Posted By Abraham Weishaus
Q34

I put together a small example and Frees' formula works, ISL's doesn't. In fact, the variance of b_j in the full model is lower than in the model with X_j only, and of course VIF cannot be less than...
Forum: MAS-I 10-28-2018, 05:33 PM
Replies: 509
Views: 77,984
Posted By Abraham Weishaus
In Frees formula, s is the standard error of the...

In Frees formula, s is the standard error of the full regression. The ISL formula is equivalent to using the standard error of the small regression. I don't believe the standard errors are the same.
Forum: MAS-I 10-28-2018, 12:22 PM
Replies: 509
Views: 77,984
Posted By Abraham Weishaus
For question 34, I found the source in the...

For question 34, I found the source in the syllabus. It's in Introduction to Statistical Learning, page 101, 6 lines from the bottom: "The VIF is the ratio of the variance of \hat\beta_j when...
Forum: Long-Term Actuarial Math 09-30-2018, 03:26 PM
Replies: 2
Views: 420
Posted By Abraham Weishaus
Loss Models defines a failure rate function which...

Loss Models defines a failure rate function which is a discrete version of the hazard rate with f(x) being a probability mass function, but that does not change the definition of the hazard rate,...
Forum: Investment / Financial Markets 09-30-2018, 03:19 PM
Replies: 2
Views: 419
Posted By Abraham Weishaus
The short-seller earns interest on the...

The short-seller earns interest on the collateral. At what rate? You know that he made 7.32, so you can back out the rate.
Forum: Investment / Financial Markets 09-23-2018, 06:13 PM
Replies: 2
Views: 403
Posted By Abraham Weishaus
The beta for cash is 0 and the beta for debt is...

The beta for cash is 0 and the beta for debt is nonzero, so they should not be combined. The proportion of debt is multiplied by a nonzero number and the proportion of cash is multiplied by 0. ...
Forum: Short-Term Actuarial Math 09-17-2018, 09:03 PM
Replies: 136
Views: 34,975
Posted By Abraham Weishaus
Stick with the definition in the textbook: Any...

Stick with the definition in the textbook: Any loss on a policy issued in calendar year x is associated with policy year x, even if it occurs after calendar year x (up to 3/10/CY3 in this example).
Forum: Short-Term Actuarial Math 08-23-2018, 09:20 PM
Replies: 4
Views: 913
Posted By Abraham Weishaus
Question 313 just asks for total amount paid. My...

Question 313 just asks for total amount paid. My question asks how much is paid to A and B. Legal fees are paid to neither; they're paid to lawyers or courts.
Forum: Short-Term Actuarial Math 08-21-2018, 12:59 PM
Replies: 1
Views: 866
Posted By Abraham Weishaus
The manual has a suggestion on page xv.

The manual has a suggestion on page xv.
Forum: Long-Term Actuarial Math 08-19-2018, 09:55 AM
Replies: 38
Views: 4,985
Posted By Abraham Weishaus
The ASM formula is correct. The ASM...

The ASM formula is correct.


The ASM manual has errors, so please refer to the errata list if a formula looks wrong.
Forum: Investment / Financial Markets 08-17-2018, 05:47 PM
Replies: 106
Views: 24,148
Posted By Abraham Weishaus
I do fix the investment to 30 at the end by...

I do fix the investment to 30 at the end by scaling it down. Doing it your way, you'd end up with 15 equity 15 debt, then lend 7.5, then find that only 22.5 is invested so scale it up by 4/3 to get...
Forum: Short-Term Actuarial Math 08-17-2018, 05:38 PM
Replies: 136
Views: 34,975
Posted By Abraham Weishaus
How were you able to use those formulas? ...

How were you able to use those formulas? E[X^100000]-E[X^10000] is the expected value of the part of any claim that's between 10000 and 100000. That's not what the question is asking for, nor does...
Forum: Long-Term Actuarial Math 08-17-2018, 05:29 PM
Replies: 1
Views: 510
Posted By Abraham Weishaus
It's an error that hasn't been fixed yet. 3/80...

It's an error that hasn't been fixed yet. 3/80 is correct.
Forum: Long-Term Actuarial Math 08-17-2018, 05:23 PM
Replies: 2
Views: 647
Posted By Abraham Weishaus
They probably used approximate integration. I...

They probably used approximate integration. I don't think a lognormal has a closed form mgf.
Forum: Short-Term Actuarial Math 08-15-2018, 09:43 PM
Replies: 136
Views: 34,975
Posted By Abraham Weishaus
The projected total payment is...

The projected total payment is Paid-Through-Current-Year * Link-Ratio, and the reserve is Projected-Total-Payment minus Paid-Through-Current-Year = Paid-Through-Current-Year * Link-Ratio minus...
Forum: Short-Term Actuarial Math 07-17-2018, 07:57 PM
Replies: 136
Views: 34,975
Posted By Abraham Weishaus
It covers the entire STAM syllabus.

It covers the entire STAM syllabus.
Forum: Long-Term Actuarial Math 07-16-2018, 08:18 PM
Replies: 568
Views: 92,692
Posted By Abraham Weishaus
They've updated the tables in the new sample...

They've updated the tables in the new sample questions, so you don't need the old Illustrative Life Tables.



I have no idea why they switched, but possible reasons are:
(1) The mortality in...
Forum: Investment / Financial Markets 07-14-2018, 11:46 PM
Replies: 1
Views: 895
Posted By Abraham Weishaus
She has 30 in equity - she owns $30 of the...

She has 30 in equity - she owns $30 of the company. The company is 50% equity 50% debt. So for every $1 of equity, there is $1 of debt.



Suppose the enterprise value of the company is $60...
Forum: Investment / Financial Markets 07-12-2018, 08:31 AM
Replies: 1
Views: 942
Posted By Abraham Weishaus
Yes. Thanks for pointing out the error. ...

Yes. Thanks for pointing out the error.
Incidentally, it is exercise 6.8.
Forum: Long-Term Actuarial Math 07-10-2018, 10:41 PM
Replies: 568
Views: 92,692
Posted By Abraham Weishaus
They won't be providing the ILT on the exam, but...

They won't be providing the ILT on the exam, but I suppose it's reasonable to assume a student has memorized the table, or knows how to reproduce it using Makeham, despite never having seen it or the...
Showing results 1 to 25 of 300

 

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