elements of aggregate report

Hi All, In the aggregate report there are elements median, % error , 90% line and throughput. so, my question is that what does these elementsmean and how are they calculated. Thanks in advance

Sending Http request parameters from beanshell script.

Hi, Is it possible to send Http request parameter from beanshell script. I have a HTTPRequest Sampler and want to send parameter with the request through bean shell script. Even if I add the parameter in HTTP Request Sampler ,then I want to change the value of that parameter from beanshell