Snowball sampling is a non-probability sampling technique that is used by researchers to identify potential subjects in studies where subjects are hard to locate.nowball sampling is a non-probability sampling technique that is used by researchers to identify potential subjects in studies where subjects are hard to locate.
In configuration management, a baseline is an agreed description of the attributes of a product, at a point in time, which serves as a basis for defining change. A change is a movement from this baseline state to a next state. The identification of significant changes from the baseline state is the central purpose of baseline identification.
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.