The field can be a number field with an auto-enter calculation or a calculation field with a result type of 1. The same expression can be used in either case:
Radio Button Field 1 = "yes" or Radio Button Field 2 = "Yes" or Radio Button Field 3 = "yes"
Put as many radio button fields as you need, separated by the Or operator. Results of "True" will enter a 1 in the field and results of "false" will enter a zero.
With an auto-entered calculation, you may or may not want to clear the "do not replace existing value" check box depending on whether or not you need to allow this field's value to be edited directly.