To determine the number of null values in a field, use the COUNT statistic on the field in question, and a COUNT statistic on a different field which does not contain nulls (for example, the OID if present), then subtract the two values. ![]() This counts each value except null values. COUNT-Finds the number of values included in statistical calculations.STD-Finds the standard deviation on values in the specified field.RANGE-Finds the range of values (MAX minus MIN) for the specified field.MAX-Finds the largest value for all records of the specified field.MIN-Finds the smallest value for all records of the specified field.MEAN-Calculates the average for the specified field.SUM-Adds the total value for the specified field.The Add Field button, which is used only in ModelBuilder, allows you to add expected field(s) so you can complete the dialog box and continue to build your model. Null values are excluded from all statistical calculations. Multiple statistic and field combinations may be specified. The numeric field containing attribute values used to calculate the specified statistic. Syntax Statistics_analysis (in_table, out_table, statistics_fields, ) Parameter When using layers, only the currently selected features are used to calculate statistics. The Add Field button allows you to add expected field(s) so you can complete the Summary Statistics dialog and continue to build your model. In ModelBuilder, where the preceding tool has not been run, or its derived data does not exist, the Statistics Field(s) parameter may not be populated with field names. The Statistics Field(s) parameter Add Field button is used only in ModelBuilder. The COUNT tool returns the number of values included in the statistical calculation, which in this case is 2. For example, the AVERAGE of 10, 5 and NULL 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 Median operation is not available.Ī field will be created for each statistic type using the following naming convention: SUM_, MAX_, MIN_, RANGE_, STD_, FIRST_, LAST_, COUNT_ (where is the name of the input field for which the statistic is computed). The following statistical operations are available with this tool: Sum, Mean, Maximum, Minimum, Range, Standard Deviation, Count, First, and Last. The Output Table will consist of fields containing the result of the statistical operation. Calculates summary statistics for field(s) in a table.
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