Texas Instruments BA II Plus - Page 95

Appendix — Reference Information 91
Standard deviation with n-1 weighting (s
x
):
Mean:
Regressions
Formulas apply to all regression models using transformed data.
Interest Rate Conversions
where: x =.01 Q NOM P CˆY
where: x =.01 Q EFF
Percent Change
12⁄
x
2
x
∑
⎝⎠
⎛⎞
2
n
--------------------
–
∑
n 1–
-----------------------------------------
x
x)
∑
(
n
---------------
=
b
nxy)
∑
( y
∑
()x
∑
()–
nx
2
∑
() x
∑
()
2
–
---------------------------------------------------------
=
a
y
∑
bx
∑
–()
n
---------------------------------
=
r
bδ
x
δ
y
--------
=
EFF 100 e
CY⁄ In× x 1÷()
( 1)–×=
N
OM 100 CY⁄ e
1 CY In×⁄÷
(
x 1+()
1)–××=
NEW OLD 1
%CH
100
--------------
+
⎝⎠
⎛⎞
#PD
=