New size study -vs- Thunders Place Data
I suspect by now most of us have seen the “new” penis size study touted in the news last week: http://onlinelibrary.wiley.com/doi/…/bju.13010/epdf
It is not really a new study, it is a literature review putting together data from several previously published reports and producing two new graphs of “average” length and girth. The pros and cons of the BJUI study are discussed in other threads but sufice it to say that the TP community are skeptical that their data reflects actual average size. I would love to believe BJUI data because it puts the averages at the low end of the accepted range, but I’m not convinced.
My purpose here is to present a comparison of the BJUI study data vs the data collected here by TP members.
(Reminder: If you haven’t already, be sure to enter your own measurements into the TP database)
The Thunder’s Place database of penis size measurements is a fantastic resource for investigating the topic. It holds over 18000 individual measurements from over 9000 individuals.
The dataset is not perfect and there are several obvious biases built in to the TP data.
1: Self selection. Not just any guy will join TP and post his penis measurements. While you could argue that TP may attract guys of average or small size who want to increase their dimension, I think it is reasonable to assume that the TP data over-represents large penises.
2: Self measurement. Suffice it to say; occasionally men have been known to overstate the size of their members.
3: Rounding error. The fact that many of the measurements are rounded to the nearest quarter or eighth inch means they are not as precise as we might like. And there is a natural tendency to round up rather than down.
The strength of the dataset is its large size. I created a simple program to filter the data to capture just the “best” measurements from the dataset.
First, I am only interested in people who have entered more than one set of measurements. Right away that eliminates much of the ‘noise’.
Since we are interested in “normal” penis size, I want to get people’s starting measurements, not their measurements after PE. To do this I take their first two entries in the database and do a quick check to make sure they are not wildly different, then average them together with added weight on the first entry.
To counteract rounding error I arbitrarily subtract a random amount up to 1/8”. This also keeps the data from clumping at the inch and half inch marks.
Using this filtered data I have plotted a new line on the BJUI graphs representing the TP member measurements.
2008 Starting size: 5.25 BPEL, 5.5 girth, vol. 12.7
2009 Plateau reached 6.5 BPEL, 6.0 girth, vol. 18.6
Last edited by marinera : 03-10-2015 at .