By analyzing and comparing the statistical characteristic and difference between sample mean,trimmed mean and Winsorised mean,the paper demonstrates the importance of substitutiy Winsoried mean for sample mean in item evaluating science and technology awards.

This paper based on the definition of trimmed mean,winsorised mean and trimmed normal distribution,we obtained that the means are the maximum likeihood estimation(MLE),their influence function are derived,the robustness can be analysed.

The results showed that the trimmed mean and Winsorized mean could describe the baseline values accurately.

With regard to statistical characteristics of valuation multiples in the field,the paper suggests using trimmed mean rather than mean or median due to its better robust efficiency.

By analyzing and comparing the statistical characteristic and difference between sample mean,trimmed mean and Winsorised mean,the paper demonstrates the importance of substitutiy Winsoried mean for sample mean in item evaluating science and technology awards.

This paper based on the definition of trimmed mean,winsorised mean and trimmed normal distribution,we obtained that the means are the maximum likeihood estimation(MLE),their influence function are derived,the robustness can be analysed.

The annual average value and monthly mean value are obtained and compared to the concentrations of air ions outside the darkroom.

with the nature of the radial function of the hydrogen atom and the nature of the laguerre polynomials,the article deduced the formula that used to compute the average value of integer power (r~n) of the radial distance of the hydrogen atom-r.

Limitation and amelioration of the standard calculating method of pH average;

It adopts simple average PI regulator.

Describes the distributions, the average, the amplitude and time lags of indoor temperature measured from 144 living rooms or bedrooms of 98 households in Beijing during the summer of 1999.