This following is a text delimited by angle brackets and we need to extract variable names from it. Please write each variable in JSON format as key value pair. Please use any sensible value for the keys. 
<The following parameters need to be specified in order to simulate a two-arm group sequential efficacy-only clinical trial with negative binomial endpoint. Control and treatment arm rate, common dispersion parameter, enrollment rate (subjects/week), study duration and accrual duration in weeks, parameter for efficacy boundary computation, number of looks, look position in terms of information fraction, total sample size and allocation ratio of subjects in two arms, significance level or alpha of the test, sidedness of hypothesis test.>