Td= time at with the curve attains its maximum values. Here E is the effort required at time t.(engineers and staffs) He represented the Rayleigh Curve by this equation It is also called Putnam- NORDEN-Rayleigh Curve or PNR curve. He studied the Staffing patterns of R & D projects and proposed that Staffing level patterns can be approximated by the "Rayleigh Distribution Curve" which specifies that the relationship between applied effort and delivery time for software project. Norden investigated the staffing pattern of R & D project. Project manager has to figure out Staff Estimation after the effort required to develop a software has been determined.
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