Symbol	1990-02	Pre-96	Post-96	$Δ β$	Dereg. Slope $(β_{r, i})$
AEP	0.3767**	0.5958**	0.2676**	−0.3327	−0.3319**
CIN	0.3620**	0.4803**	0.2859**	−0.1936	−0.1957**
CMS	0.2860**	0.4446**	0.2299**	−0.2167	−0.2090**
D	0.3550**	0.4671**	0.2870**	−0.1806	−0.1700**
DPL	0.3403**	0.4836**	0.2786**	−0.2059	−0.1892**
DTE	0.4145**	0.6817**	0.3024**	−0.3795	−0.3594**
DUK	0.4259**	0.6035**	0.3203**	−0.2851	−0.2865**
ED	0.4161**	0.7617**	0.2752**	−0.4833	−0.4735**
EDE	0.1581**	0.0006	0.2178**	0.2167	0.1405**
EIX	0.4728**	0.6132**	0.3759**	−0.2317	−0.2334**
ETR	0.3177**	0.5667**	0.1984**	−0.3683	−0.3647**
FPL	0.3333**	0.5296**	0.2283**	−0.3013	−0.2905**
GMP	0.0002	0.0021	0.0002	0.0000	−0.0012
HE	0.2489**	0.2895**	0.2363**	−0.0590	−0.0668
IDA	0.2845**	0.3205**	0.2787**	−0.0388	−0.0319
NI	0.2755**	0.3505**	0.2486**	−0.1030	−0.1039*
NU	0.2669**	0.4239**	0.1935**	−0.2200	−0.1991**
OGE	0.2699**	0.3577**	0.2376**	−0.1206	−0.1254**
PCG	0.4541**	0.6932**	0.3100**	−0.3813	−0.3788**
PEG	0.3984**	0.6191**	0.2929**	−0.3348	−0.3249**
PGN	0.4020**	0.6364**	0.2990**	−0.3414	−0.3346**
PNM	0.3639**	0.5093**	0.3138**	−0.1959	−0.1845**
PNW	0.2893**	0.5530**	0.1874**	−0.3644	−0.3793**
POM	0.3374**	0.4240**	0.2886**	−0.1418	−0.1326**
PPL	0.3285**	0.3310**	0.3267**	−0.0058	0.0085
PSD	0.2701**	0.3450**	0.2416**	−0.1026	−0.0996*
SCG	0.2712**	0.3196**	0.2518**	−0.0710	−0.0725*
SO	0.3853**	0.6699**	0.2439**	−0.4213	−0.3995**
SRP	0.2788**	0.2685**	0.2875**	0.0149	0.0032
TE	0.2643**	0.3599**	0.2292**	−0.1366	−0.1295**
TXU	0.3321**	0.4801**	0.2580**	−0.2233	−0.2308**
UIL	0.2545**	0.2244**	0.2784**	0.0534	0.0414
UTL	0.0000	0.0003	0.0368	0.0029	0.0003
WEC	0.2900**	0.3969**	0.2519**	−0.1460	−0.1355**
WPS	0.2682**	0.3307**	0.2459**	−0.0946	−0.0921**
WR	0.2519**	0.3273**	0.2249**	−0.1027	−0.1209**
Median	0.3044	0.4373	0.2542	−0.1871
Mean	0.3070	0.4293	0.2489	−0.1804