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When symbolizing data with the graduated color renderer to show the difference between features in a map, the field is not listed in the Value drop-down list in the Layer Properties dialog box.
The field does not appear in the Value drop-down list because it is not a numeric field. The graduated color renderer requires a numeric field, so the Value drop-down list only displays numeric fields (Short integer, Long integer, Float, Double).
Create a new field with a numeric data type, and use the Field Calculator to copy the data from the field to symbolize.
Note: If the attribute table is derived from an Excel file, changing the format of the cell to the Number category is an alternate solution.