I'm using Excel 2010 Home and Student edition.

I've created a column, B, of questions which need to be answered on a
scale from 0-5. Columns C-H are to be checked with an "X" or whatever
character they see fit to indicate which answer they have chosen.

For example, one of the questions in column B says, On a scale of 0-6,
how painful is it for you to climb one flight of stairs?" The choices
are, 0, column C, "not difficult," 1, column D, "minimally difficult,"
etc. all the way up to 5, column H "unable to do." The end result is
that column I figures out which column the "X" was placed and enters the
numerical result.

This is the formula I concocted for column "I"

=IF(NOT(ISBLANK(C21)),0,IF(NOT(ISBLANK(D21)),1,IF( NOT(ISBLANK(E21)),2,IF(NOT(ISBLANK(F21)),3,IF(NOT( ISBLANK(G21)),4,IF(NOT(ISBLANK(H21)),5,"Missing
entry"))))))

I know it's not foolproof (against multiple entries in the same row) but
it does seem to work. The problem I've encountered happens if I decide
to change one of my answers from any of the columns, and then paste it
into another column. In other words, suppose I put an "X" in the,
"minimally difficult" column and want to change it to the "not
difficult," column. I use a copy and paste operation. It seems pretty
straightforward, right? However the formula in the column I that figures
out where the "X" is gets modified to:

=IF(NOT(ISBLANK(#REF!)),0,IF(NOT(ISBLANK(C22)),1,I F(NOT(ISBLANK(E22)),2,IF(NOT(ISBLANK(F22)),3,IF(NO T(ISBLANK(G22)),4,IF(NOT(ISBLANK(H22)),5,"Missing
entry"))))))

If I open the same spreadsheet in OpenOffice Calc, this problem does not
exist. Is there some option in Excel that I can enable/disable to
prevent this from happening?

Thanks for your reply.
--
David Farber
Los Osos, CA