
Portfolio beta coefficient:
•
β∑PiSiβi
=
Tn
T
Canadian Mortgages
• r = annual interest rate expressed as a decimal.
•
| 
 |  | 
 | 
 | 1 |  | 
 | 
| 
 | 
 | 
 | 
 | |||
| monthly factor |  |  | r |  6 |  | ⋅ 100 | 
| =  | 
 | 1 +  | 
 | – 1 | ||
| 
 |  |  | 2 |  | 
 | |
| 
 |  | 
 | 
 | 
 |  | 
 | 
Miscellaneous
Learning Curve for Manufacturing Cost
•Cn = Cost of the nth unit.
•C1 = Cost of the first unit.
•n = number of units.
•r = learning factor.
•k = ln r / ln 2
•Cn = C1nk
Cij = the average cost of the ith through jth unit.
•
| 
 | 
 | = | C1 | 
 | jk + 1 – ik + 1 | |
| 
 | 
 | 
 | ||||
| Cij | ||||||
| 
 | ||||||
•This formula is only approximate and may give appreciable error at small i.
162
