Home Forums SOA Exams Easy 1/m type APVs from a survival function using Excel

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Richard Purvey
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Actuarial Contingencies: A simple way to get an Excel spreadsheet to calculate 1/m type APVs based on a survival function

Here is a simple way to get an Excel spreadsheet to calculate five APVs (the first four being 1/m type APVs) based on a survival function, S. The five APVs are;

APV1

APV of an n-year temporary immediate life annuity, with a discount factor of v, of 1 per year payable m times per year for (x)

APV2

APV of an n-year temporary life annuity due, with a discount factor of v, of 1 per year payable m times per year for (x)

APV3

APV of an endowment insurance, with a discount factor of v, of 1, where the death benefit is payable at the end of the 1/m year of death for (x), provided this occurs within n years

APV4

APV of a death benefit, with a discount factor of v, of 1 payable at the end of the 1/m year of death for (x), provided this occurs within n years

APV5

APV of a pure endowment, with a discount factor of v, of 1 payable after n years as long as (x) is still alive then

Method;

COLUMN A

Put the heading, x, into cell A1

COLUMN B

Put the heading, n, into cell B1

COLUMN C

Put the heading, m, into cell C1

COLUMN D

Put the heading, v, into cell D1

COLUMN E

Put the heading, r, into cell E1, and put the value, 0, into cell E2 and input the formula, =E2+1 into cell E3 and copy this formula down to, and including, cell Emn+2

For example, if m=4 and n=10, cell Emn+2 would then be cell E42

COLUMN F

Put the heading, r/m, into cell F1, and input the formula, =E2/\$C\$2 into cell F2 and copy this formula down to, and including, cell Fmn+2

COLUMN G

Put the heading, v^(r/m), into cell G1, and input the formula, =\$D\$2^F2 into cell G2 and copy this formula down to, and including, cell Gmn+2

COLUMN H

Put the heading, x+r/m, into cell H1, and input the formula, =\$A\$2+F2 into cell H2 and copy this formula down to, and including, cell Hmn+2

COLUMN I

Put the heading, S(x+r/m), into cell I1, and input the formula, =S(H2), for example =EXP(-0.00022*H2-2.7*10^(-6)*(1.124^H2-1)/ln(1.124)), into cell I2 and copy this formula down to, and including, cell Imn+2

COLUMN J

Put the heading, v^(r/m)S(x+r/m), into cell J1, and input the formula, =G2*I2 into cell J2 and copy this formula down to, and including, cell Jmn+2

COLUMN K

Put the heading, APV1, into cell K1, and input the formula, =SUM(J3:Jmn+2)/(C2*I2) into cell K2

COLUMN L

Put the heading, APV2, into cell L1, and input the formula, =SUM(J2:Jmn+1)/(C2*I2) into cell L2

COLUMN M

Put the heading, APV3, into cell M1, and input the formula, =1-C2*(1-D2^(1/C2))*L2 into cell M2

COLUMN N

Put the heading, APV4, into cell N1, and input the formula, =M2-J(mn+2)/I2 into cell N2

COLUMN O

Put the heading, APV5, into cell O1, and input the formula, =M2-N2 into cell O2

x, n, m and v are, of course, input by the user into cells A2, B2, C2 and D2 respectively.

To utilise the Excel spreadsheet to calculate the five APVs for a list of values for x (x=z,z+1/m,…h), on the same n, m and v basis in the case of each x, simply;

First

Put the value, z, into cell A3 and input the formula, =A3+1/\$C\$2 into cell A4 and copy this formula down to, and including, the column A cell in which the value, h, appears.

Next

Write a loop in Visual Basic which will;

Copy from cell A3 and then paste this VALUE to cell A2 and then copy from cells: K2, L2, M2, N2 and O2 and then paste these VALUES to cells: K3, L3, M3, N3 and O3 respectively and then

Copy from cell A4 and then paste this VALUE to cell A2 and then copy from cells: K2, L2, M2, N2 and O2 and then paste these VALUES to cells: K4, L4, M4, N4 and O4 respectively and then

Copy from cell A5 and then paste this VALUE to cell A2 and then copy from cells: K2, L2, M2, N2 and O2 and then paste these VALUES to cells: K5, L5, M5, N5 and O5 respectively and then

Copy from cell A6 and then paste this VALUE to cell A2 and then copy from cells: K2, L2, M2, N2 and O2 and then paste these VALUES to cells: K6, L6, M6, N6 and O6 respectively and then

Repeat this process until finally copying from the column A cell in which the value, h, appeared and then pasting this VALUE to cell A2 and then copying from cells: K2, L2, M2, N2 and O2 and then pasting these VALUES to the column K, L, M, N and O cells, in the row in which the value, h, appeared, respectively.

Finally

Run this Visual Basic code.

The column K, L, M, N and O cells in row 3 downwards now show the five APVs for x=z,z+1/m,…h respectively.

Richard Purvey November 2023.

No commutation functions, NO recursion formulae and NO approximate methods. Bringing actuarial life contingencies, APV calculations, into the 21st century!

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