The final part of the 18-34 demo post's is up at Spotted Ratings . Ed looks at combining his 18-49 True rating with the 18-34 True rating and how this may explain why some marginally rated shows get renewed. Since the main purpose of this type of look is to understand why marginal shows may get renewed and, since TBBT is no where near a marginal show, this type of look wouldn't normally include TBBT. However a question by a reader of the post asked for a comparison between How I Met Your Mother and TBBT. As a result, we have a a look at the ratings of TBBT in this calculated numbers.
For instance, TBBT has a "raw" number score of 5.26 in the 18-49 demo. This is the number reported by Nielsen. At Spotted Ratings, Ed uses some calculation and includes the strength of a show's lead-in, strength of the other shows airing at the same time, number of people watching for a given time, etc. In this, TBBT has what Ed calls a "True" score of 5.46, in TBBT's case, this is higher than it's raw score. It's total score of the combination 18-49 demo and 18-34 demos is 9.11. That means that TBBT 18-34 True number is 3.65. In the article Ed give the 18-34/18-49 combined True scores for 51 different shows. TBBT 18-34 True score is higher than the combined 18-49/18-34 of all 51 of those shows, in the post. Again, giving an idea of just how big TBBT is.
Again, I recommend you visit Spotted Ratings. Ed does an outstanding job with the alternate ways of looking at the ratings and explaining it. I again want to thank him for graciously allowing me to summarize and link to his explanations.