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A Principal protected note (PPN) is an investment contract with a guaranteed rate of return of at least the amount invested, and a possible gain.. Although traditional fixed income investments such as guaranteed investment certificates (GICs) and bonds provide investment security with little or no risk of capital loss, they provide modest returns.
Johnson's -distribution has been used successfully to model asset returns for portfolio management. [3] This comes as a superior alternative to using the Normal distribution to model asset returns.