Post your questions and comments for Outdoor Aerobiology posters here. Please include the number of the poster (indicated before the last name on each PDF link) in the subject line so the author(s) can easily locate comments pertinent to them.


Correlation coefficient is 0.37 for ragweed between Rotorod and Burkard side by side in your study.


Our study, poster 109, correlation is 0.52 for ragweed for Rotorod  n Burkard, but they were 20 miles apart. 


can you comment on reasons for the differences?

Dan Dalan replied on

Therefore am I to conclude that one device is better that the other?

For a side by side, co located devices, the ragweed correlation is moderate and am surprised by your findings. I expected much higher correlations, and have seen higher in other studies.  

But for a population of allergy sufferers , I rhetorically ask, is this lower than expected correlation relevant anyways.

 If reported as high, medium, low as categories, rather than numbers, the two devices reporting would probably be very close. This is one way to standardize, currently done by the NAB method of reporting, by categories instead of numbers.

Dan Dalan replied on

How can we at the National Allergy Bureau help each other with our common goals?

Dan Dalan replied on