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When symbolizing a numeric field in ArcMap in the Layer Properties dialog box on the Symbology tab under Quantities and under Graduated colors, a blank Field Value drop-down list results from generating data using the CSV file.
String fields cannot be symbolized. Symbolizing by quantity requires a numeric field.
In the Symbology tab, the Graduated colors option is often used to symbolize the fill of a polygon with quantities. Quantities are typically used with quantitative data or numeric fields, while categories are typically used with qualitative data, string fields, or text fields.
A schema.ini file must be created to override the field data type from the delimited text file (CSV file).