In the last few weeks, I’ve been trying to
find a better way to calculate the Partisanship Index (PI), one which
will reduce the suspected elevation of Democratic scores caused
by the greater opportunities naturally present during a Republican
administration. First I proposed equally weighting a
columnist’s treatment of Democrats and Republicans. But a reader suggested that when a
columnist chooses to talk far more about one party than the other,
it’s significant and should be somehow taken into account by the
scoring system. I agree, so I’m proposing a way to adjust the
calculation of PI to “normalize” a pundit’s party balance. My idea is
to estimate the imbalance in party references that would be
legitimately caused by the fact that one party controls more of the
levers of government.
To estimate that imbalance for 2002, I added up all of the party
references (positive, negative and neutral) from all of the 37
pundits. With George W. Bush in the White House, the pundits
mentioned Republicans more than Democrats by a 62/38 ratio. So if a
columnist wrote about the parties in that same proportion, it wouldn’t
be fair to let their final score depend more heavily on their
treatment of Republicans. To avoid that, I’m proposing that an
adjustment of 12 percentage points should be added to each
Democratic weight and subtracted from each Republican weight. The
equation for PI would then be:
PI = 100 * [(Df+Dadj)*DI - (Rf+Radj)*RI]
where DI and RI are the Democratic Index and Republican Index, and Df
and Rf are each party’s fraction of the total references:
Dt Rt
Df = --------- , Rf = ---------
(Dt + Rt) (Dt + Rt)
Dadj and Radj are the adjustments necessary to correct the
imbalance of references caused by the imbalance of political power. For
2002, Dadj would be +0.12 and Radj would be -0.12. If a
columnist chooses to overemphasize one party or the other, then their
scores will reflect that even after the adjustment. The table below
shows the ratio of party references for each of the 2002 Top Ten
pundits and their ratio after the 62/38 normalization is made.
|
Columnist |
R/D ratio |
adjusted |
| 1 |
Paul Krugman |
86/14 |
74/26 |
| 2 |
Collin Levey |
59/41 |
47/53 |
| 3 |
Claudia Rosett |
71/29 |
59/41 |
| 4 |
Robert L. Bartley |
60/40 |
48/52 |
| 5 |
Michael Kelly |
51/49 |
39/61 |
| 6 |
Mary McGrory |
61/39 |
49/51 |
| 7 |
Daniel Henninger |
52/48 |
40/60 |
| 8 |
Frank Rich |
68/32 |
56/44 |
| 9 |
Michael Kinsley |
81/19 |
69/31 |
| 10 |
Pete du Pont |
59/41 |
47/53 |
You can see that even after the adjustment, columnists like Paul
Krugman would have scores which depend more heavily on their (negative)
treatment of Republicans, while columnists like Michael Kelly would
have scores which depend more heavily on their (negative) treatment of
Democrats.