For the third week in the last five (through October 23), David Letterman'shas beaten 's in the adults 18-49 demo. For the week ending October 23 both shows were in repeats.
There was some spirited debate attached to my original post about the disappearance of 's adults 18-49 lead over Letterman and whether it might be the start of a long term trend. I hesitate to use repeat ratings as a trend indicator, but here's the latest chart.
The trend lines above are 4 week moving averages.
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Nielsen TV Ratings Data: ©2009 The Nielsen Company. All Rights Reserved.