![]() To determine the number of null values in a field, create a count on the field in question, create a count on a different field that does not contain null values (for example, the OID if present), and subtract the two values. Each value will be counted except null values. COUNT-The number of values included in the statistical calculations will be found.STD-The standard deviation of values in the specified field will be calculated.RANGE-The range of values (maximum minus minimum) for the specified field will be calculated.MAX-The largest value for all records of the specified field will be found.MIN-The smallest value for all records of the specified field will be found. ![]() MEAN-The average for the specified field will be calculated.SUM-The values for the specified field will be added together.Unique-The number of unique values of the specified field will be counted.Variance-The variance for all records of the specified field will be calculated.Median-The median for all records of the specified field will be calculated.Last-The specified field value of the last record in the input will be used.First-The specified field value of the first record in the input will be used.Count-The number of values included in the statistical calculations will be found.Standard deviation-The standard deviation of values in the specified field will be calculated.Range-The range of values (maximum minus minimum) for the specified field will be calculated.Maximum-The largest value for all records of the specified field will be found.Minimum-The smallest value for all records of the specified field will be found.Mean-The average for the specified field will be calculated.Sum-The values for the specified field will be added together.Numeric attribute fields can be summarized using any statistic.Īvailable statistics types are as follows: Text attribute fields can be summarized using first and last statistics. Null values are excluded from all statistical calculations. Multiple statistic and field combinations can be specified. Specifies the numeric field or fields containing the attribute values that will be used to calculate the specified statistic. When using layers, only the currently selected features will be used to calculate statistics. For example, the average of 10, 5, and a null value is 7.5 ((10 5)/2). If one is specified, there will be one record for each Case field value. The Output Table will contain only one record if no Case field is specified. If a Case field is specified, statistics will be calculated separately for each unique attribute value. The field name is truncated to 10 characters when the output table is a dBASE table. The following statistical operations are available with this tool: sum, mean, minimum, maximum, range, standard deviation, count, first, last, median, variance, and unique.Ī field will be created for each statistic type using the following naming convention: SUM_, MEAN_, MIN_, MAX_, RANGE_, STD_, COUNT_, FIRST_, LAST_, MEDIAN_, VARIANCE_, and UNIQUE_ (where is the name of the input field for which the statistic is computed). Frequency is used to find the mode of a data set.The Output Table will consist of fields containing the result of the statistical operation. ![]() \ \% \]įrequency is the number of occurrences for each data value in the data set. ≤ x n from lowest to highest value, the minimum is the smallest value x 1. This calculator uses the formulas and methods below to find the statistical values listed. Descriptive Statistics Formulas and Calculations See allowable data formats in the table below. You can also copy and paste data from spreadsheets or text documents. Enter data values separated by commas or spaces. This calculator generates descriptive statistics for a data set. Examples of descriptive statistics include: Calculator Use What are Descriptive Statistics?ĭescriptive statistics summarize certain aspects of a data set or a population using numeric calculations.
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