Stratified sampling is a method of sampling from a population in statistics. When sub-populations vary considerably, it is advantageous to sample each subpopulation (stratum) independently. Stratification is the process of grouping members of the population into relatively homogeneous subgroups before sampling.tratified sampling is a method of sampling from a population in statistics. When sub-populations vary considerably, it is advantageous to sample each subpopulation (stratum) independently. Stratification is the process of grouping members of the population into relatively homogeneous subgroups before sampling.
Hardening (computing) In computing, hardening is usually the process of securing a system by reducing its surface of vulnerability, which is larger when a system performs more functions; in principle a single-function system is more secure than a multipurpose one.
In the graph above the âactual valueâ is the current value for a particular counter. The baseline signature is a moving average and standard deviation computed over time. The baseline signature envelope is a value which if the performance counter exceeds raises an alert. The sensitivity setting lets you choose the baseline range for your counter. If the sensitivity is low then users will get alerts for a counter thatâs has had a drastic change from the previous set baseline. Low sensitivity also generates fewer alerts as a result of this.