Help writing a formula (nested If statements)

How do you get 1 for B, D and E based on your description?

Based on your results, it seems you just want:
=IF(D3<>D4,1,0)
but your description is:
=IF(AND(D3<>D4,D4=D5),1,0)

I agree with Rory, based on your notes in column A the results in column E should be:

1     D4 has nothing above so it doesn't equal but is the same D5
0     D5 is the same as D4 and the same as D6
0     D6 does match D5 but does not match D7
0     D7 Doesn't match D6 or D8
1     D8 does not match D7 but does match D8
0     D9 matches D8 but not D10
0     D10 doesn't match D9 or D11
0     D11 doesn't match D10 and nothing below

Sorry I forgot to add the rule:  If the cell above me and the cell below me do not match = 1

I can write the if statements independent of each other, where I am having the issue is putting them all into one formula, so it can copy it down.  Thanks. -R-

The description is incomplete.
need to add a line:
in other case: 1

without simplification it is:
=IF(AND(D4<>D3;D4=D5);1;IF(AND(D4=D3;D4=D5);0;IF(AND(D4=D3;D4<>D5);0;1)))

I updated the attachment.. with the added rule.
IfStatementsFormula2.xlsx

I think they both work...  E6 is getting a zero when testing...  I guess another way of explaining this is that each unique value needs a "1".  If it shows again it gets a "0".  Does anyone see an issue with either way?

RWayneH....did you try my formula?  It matches your output - and I believe your intent. :-)

Yes, yours and Rory's are working.  Gauthier, did have issues when the one above and below did not match.  I was working with that one and did not see your posts...  Thanks

Based on the requirements I think Rory's makes the most sense.  The only time you want a "1" is when below matches regardless of what above is.

So long as the data in column D is sorted, Rory's formula is the simplest and most-straightforward.

If the data in column D is not sorted and you still wanted to identify the first occurrence of a value in that column, the COUNTIF formula will do that.

-Glenn

oh I was reading it: If above me is not the same as me = 1  if it is the same = 0.  I think we are saying the same thing... I like Glen's however I am having issue decoding that syntax.  =IF(COUNTIF($D$4:D4,D4)=1,1,0)  If an thinking that the ending of 1,0) is like an offset of the cell, one down?

By my reckoning my formula requires the least processing power/time. :)

RWayneH:
The formula I provided is broken down like so:

=IF
    (COUNTIF($D$4:D4,D4)=1 <--- If the range from D4 up to the current cell (which happens to also be D4 in the very first occurrence of this formula in cell E4) is equal to 1, then it means that this is the first time this value has occurred in the entire range up to this point
   ,1  <-  if the above is true, then return 1
   ,0)  <-  otherwise (if the count is greater than one), return zero

The formula in cell E9, for example looks like this:
=IF(COUNTIF($D$4:D9,D9)=1,1,0)

Since the COUNTIF function returns 2 here (because there are 2 "C" values at this point, the formula returns a zero.

But, as I noted, so long as your data in column D is sorted, Rory's formula is simpler (and faster).

Thanks for the help.

My formula match the output or your sheet exactly, you probably made an error when testing it.
But as I said, it can be simplified:
if you match TRUE==1 & FALSE == 0
IF(A;0;1) === not A
IF(A;1;0) === A
IF(A;1;B) === A or B
IF(A;0;B) === not A or B

I believe you are right, my testing was not right, sorry for awarding the points to the others.  You deserved some too. -R-