class ApacheCrunch::ConfidenceInterval
DSL routine that determines a confidence interval for the values to which the block evaluates
For example,
confidence_interval 95 do time_to_serve end
would return two numbers, the lower and upper bound of a 95% confidence interval for the values of time_to_serve.
This routine returns a float, and the block must always evaluate to something with a to_f method.
Public Instance Methods
execute(confidence, &blk)
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# File lib/procedure_dsl.rb, line 216 def execute(confidence, &blk) # Build a list of all the values found values = [] while @_current_entry = @_log_parser.next_entry values << instance_eval(&blk).to_f end values.sort! # Determine how many values are outside the bounds of the CI count_outside = (values.length * (1.0 - confidence/100.0)).to_i # Find the bounds of the confidence interval return values[count_outside / 2], values[-count_outside / 2] end