# Rolling The rolling function has the following syntax: **`rolling(, , , , min periods = 2)`**

Parameter	Description	Value	Mandatory
Variable	It shows the measurements of a sensor as a time series of data points that vary over time. Also known as "dots", it's identified by a variable label.	Variable label	YES
Aggregation method	Function where the elements of a time series are computed to return a single summary value.	mean, sum, min, max, count	YES
Type of range	Indicates whether a date range or a set number of elements are used to sample the time series.	window or values	YES
Range	The time window in wich the function will be computed. NOTE: The selected range for a "window" should be set in a way that evenly divides the next range. For example, if using minutes ("T"), whatever the number n is, it has to evenly divide an hour ("H"). Available values for minutes are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30. Other values may render unexpected results. Same applies to other ranges.	Available data ranges: this is a positive integer, representing the number of observations used for each window or a time range specified as follows: "nT": Every n minutes "nH" : Every n hours "nD": Every n days	YES
Min periods	Number of values needed to calculate the mobile aggregation, by default it is set in 2 which is the minimum required.	`min_periods = n`, where n is a positive integer.	NO