Research On The Yield Of Yu’e Bao Based On The Non-normal EWMA Chart

Yu’e Bao is an internet financial product co-launched by Tianhong Asset Management Co. Ltd and Alipay, and it is the largest monetary fund in China at present. High yield is a big magic weapon that Yu’e Bao attracts customs initially. It is a challenge for Tianhong Asset Management Co. Ltd to monitor the Yu’e Bao’s yield for ensuring the relatively higher yield. Exponentially weighted moving average control chart is an effective statistical control strategy in process control. Hence, it has important guiding value for Tianhong Asset Management Co. Ltd to monitor the Yu’e Bao’s yield based on EWMA control chart.Firstly, this thesis utilizes three normality test methods to test Yu’e Bao’s yield data from May 31, 2013 to May 3, 2016, and the tested result shows that the data does not obey normal distribution. Secondly, for the non-normal data, we construct WV-EWMA and SC-EWMA control charts by means of the weighted variance and skewness correction methods, respectively. Finally, we research the Yu’e Bao’s yield for the single and multiple observations of the sample data by the constructed two control charts, respectively.The results researched by WV-EWMA and SC-EWMA control charts show that the Yu’e Bao’s yield remains at a low level since September 30, 2015, and that the yield is lower than the customer expectations. Some customers may consider withdrawing their fund from Yu’e Bao and buying other financial products if the Yu’e Bao’s yield always remains at the low level. Consequently, we advise the Tianhong Fund Management Co. Ltd to take new investment measures to turn the scale and further to retain these customers.