# Search Results

1. Post

### CS1A September 2019 9(ix a)

Yes, the question isn't clear. The examiners wanted the variance of the distribution of X for the various values of theta.
Post by: John Lee, Apr 18, 2022 in forum: CS1
2. Post

### Time Series -Chap13: "Autoregressive Model more convenient than Moving Average"

I believe, though I could be wrong, that it is more convenient because it depends on past observable values - whereas the MA doesn't have that...
Post by: John Lee, Apr 11, 2022 in forum: CS2
3. Post

### PBOR CS1 Truncated notes in the text files

Are you referring to the theoretical distribution of the prior p~beta(2,3)? In which case the mean is 2/(2+3) = 0.4 and the variance is exactly...
Post by: John Lee, Mar 18, 2022 in forum: CS1
4. Post

### PBOR CS1 Truncated notes in the text files

They're given in "text format" as they are .R files which can be run in R, rather than PDFs or word documents which can't. Whilst they're fine in...
Post by: John Lee, Mar 17, 2022 in forum: CS1
5. Post

### CS1-09 Hypothesis Testing

Post by: John Lee, Mar 11, 2022 in forum: CS1
6. Post

### Q&A Bank Part 4 qstn 4.3 (Continuity Correction)

Post by: John Lee, Jan 25, 2022 in forum: CT3
7. Post

### Q&A Bank Part 4 qstn 4.3 (Continuity Correction)

So this "towards the mean" is only used in hypothesis tests in Chapter 10. This is because when we calculate the p-value for the binomial/Poisson...
Post by: John Lee, Jan 24, 2022 in forum: CT3
8. Post

### CS1 exam reference material during exam

Yes.
Post by: John Lee, Oct 11, 2021 in forum: CS1
9. Post

It's always worth dropping an email to the examinations team at the IFoA.
Post by: John Lee, Sep 17, 2021 in forum: General study / exams
10. Post

### Converting from RStudio to word

Post by: John Lee, Sep 7, 2021 in forum: CS1
11. Post

### Is copying and pasting from R/Excel to Word allowed?

Part of the copy/paste ban is to prevent students using pre-written solutions or, obviously, copying other people's work. You still have to be...
Post by: John Lee, Aug 30, 2021 in forum: General study / exams
12. Post

### To what extent are we allowed to use R/graphics calculator in the CS1A exam?

The examiners have made it very clear that working needs to be shown to receive all the marks. For distributions, you should also only use...
Post by: John Lee, Aug 18, 2021 in forum: CS1
13. Post

### Mathematical Equation--CM2

You can - but it's not recommended because of the time it takes to write equations in equation mode.
Post by: John Lee, Jul 2, 2021 in forum: General study / exams
14. Post

### "PriceWalking": a failure that happened on the IFoA's watch

Personal view: This is hardly a scandal. It's a standard business approach of using a loss leader or just a cheaper price to get new business...
Post by: John Lee, Jun 7, 2021 in forum: Off-topic
15. Post

### Question regarding referencing for Qs

Option 1 seems sensible.
Post by: John Lee, Apr 19, 2021 in forum: General study / exams
16. Post

Yes, but don't include your name - markers aren't supposed to know!
Post by: John Lee, Apr 8, 2021 in forum: General study / exams

### RStudio v1.4 copy and paste issues

It appears the newest version of RStudio (1.4) makes copying and paste output from the console into Word more difficult. You'll need to use...
Thread by: John Lee, Apr 8, 2021, 0 replies, in forum: CS2

### RStudio v1.4 copy and paste issues

It appears the newest version of RStudio (1.4) makes copying and paste output from the console into Word more difficult. You'll need to use...
Thread by: John Lee, Apr 8, 2021, 0 replies, in forum: CS1
19. Post

### assessment regulations: copy-paste and modifying

You are welcome to address this to the IFoA's examinations team (who are responsible for the exams - rather than ActEd or students on this forum)...
Post by: John Lee, Apr 1, 2021 in forum: CS1
20. Post

### Notation

Nope. Although, there is a general nesting order of brackets: { [ (
Post by: John Lee, Mar 19, 2021 in forum: CS1
21. Post

### Changing to a different SP exam

SP1 overlaps the syllabus of SP2 so there would be some natural synergy.
Post by: John Lee, Jan 4, 2021 in forum: General study / exams
22. Post

### Exam script review and analysjs

Just compare it with the SP2 solutions which are available for free on the Profession's website:...
Post by: John Lee, Jan 4, 2021 in forum: General study / exams
23. Post

### Two population proportion - Binomial case

You're using a normal approximation to the binomial and then doing the subtraction of two normal distributions (see p41 of chapter 4).
Post by: John Lee, Sep 9, 2020 in forum: CS1
24. Post

### Coefficients of Lower and Upper Tail dependencies (Copulas CS2 Chapter 12)

There's only a definition for the positive interdependence as that is what we, as actuaries, are worried about. eg extreme events lead to greater...
Post by: John Lee, Sep 7, 2020 in forum: CS2
25. Post

### cs1b chap 7 point estimation , example 7.1

You stored it in children but then did c <-Children\$V1 And R is case sensitive.
Post by: John Lee, Aug 23, 2020 in forum: CS1
26. Post

### We need further guidance on aswering questions on Microsoft Word

They have already given us more than 3 months notice. This allows time for the examiners to rewrite the schedule so there is less maths and then...
Post by: John Lee, May 30, 2020 in forum: General study / exams
27. Post

### BPP VLE Practice Exam

Post by: John Lee, Apr 14, 2020 in forum: Off-topic
28. Post

### BPP VLE Practice Exam

Which subject are you referring to Zair?
Post by: John Lee, Apr 14, 2020 in forum: Off-topic
29. Post

### uk april 2005 exam question 9 part ii-a - ct6 - glm

In part (ii) it tells you that $$\log \mu_i = \alpha$$ for $$i=1,2,...m$$ So you are just replacing the $$\mu_i$$'s with $$e^{\alpha}$$
Post by: John Lee, Mar 30, 2020 in forum: CS1
30. Post

### Ch 13 question number 13.9 part (iv)

Model 2 has 5 parameters.
Post by: John Lee, Mar 26, 2020 in forum: CS1
31. Post

### Coronavirus effect on exams

You need to contact the examinations team at the IFoA directly.
Post by: John Lee, Mar 12, 2020 in forum: General study / exams
32. Post

### Mean response vs individual response

Probably a bit late for an answer now - but it's talking about the predicted value. The mean predicted value is on the regression line (a...
Post by: John Lee, Sep 17, 2019 in forum: CS1
33. Post

### Ch 13 scaled deviance and AIC

We only do this for members of the exponential family - so Poisson, normal, gamma, exponential and binomial.
Post by: John Lee, Sep 3, 2019 in forum: CS1
34. Post

### Ch 12 Practice questions Q12.9 (iv)

You subtract the number of new parameters added each time between the models
Post by: John Lee, Sep 3, 2019 in forum: CS1
35. Post

### CH8 error in def monotonic decreasing?

I'm a little confused. It is the opposite of monotonic increasing so I'm not sure how this can be an error...
Post by: John Lee, Jun 19, 2019 in forum: CS1
36. Post

### Choosing a SP purely on academic strengths

ST6 has some stonking maths (which is why I took it) - similar to CT4 and CT8.
Post by: John Lee, Jan 7, 2019 in forum: General study / exams
37. Post

### April 2016 Question 6

Our d3 and d4 are labelled differently. Also we have given answers as % rather than euros.
Post by: John Lee, Sep 11, 2018 in forum: CT6
38. Post

### Mathematical Properties of Poisson Process

It basically means that when we set up our derivative from first principles and thus divide by h, then these terms will disappear and so don't...
Post by: John Lee, Sep 11, 2018 in forum: CT3
39. Post

### Revision notes booklet 3 practice qn 5

We want E(SI) = E(N)E(Y) the N is unchanged by the proportional reinsurance - it only affects how much you pay. E(Y)= 0.9E(X)
Post by: John Lee, Aug 15, 2018 in forum: CT6
40. Post

### Random variation vs. White noise process

Essentially we are removing everything that is "obviously" not stationary to the naked eye.
Post by: John Lee, Jul 23, 2018 in forum: CT6
41. Post

### Interpretation of the constant in AR(P) process.

1. Mu would be there but would be a function of time. 2. Because we like to know the mean. 3. Even if it were a constant then it would still add...
Post by: John Lee, Jul 23, 2018 in forum: CT6
42. Post

### Q&A Bank Part 1 Q1.1(ii)

Good point. We could have eliminated all the other strategies through domination to achieve the same answer.
Post by: John Lee, Jul 23, 2018 in forum: CT6
43. Post

### Chapter 10 Exam Type Question

(1-F(X))^n gives [P(X>x)]^n = P(Xmin > X) But we want the CDF of Xmin, hence we want P(Xmin <x) and thus we need the 1-
Post by: John Lee, Jun 19, 2018 in forum: CT3
44. Post

### Risk parameter under EBCT model 1

Yes, which is why we always fix the value of theta. eg $$E(X|\theta)$$
Post by: John Lee, Jun 19, 2018 in forum: CT6
45. Post

### Urgent help please- conditional probability

Personally I would stuff the whole conditional worries and draw a tree diagram. It's much much easier to work from this.
Post by: John Lee, Apr 18, 2018 in forum: CT3
46. Post

### CT6 April 2008 Question 4 iii)

Deviance residual is calculated for each individual data value - not for the whole sum.
Post by: John Lee, Apr 18, 2018 in forum: CT6