If you data is in column A, then in B2 enter:
=IF(AND((A2A1),(A2A3)),"peak","") and copy down
In C2 enter:
=IF(AND((A2<A1),(A2<A3)),"trough","") and copy down
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Gary's Student


"James Booth" wrote:

If I have a range of data that goes up and down in value. Is there any way to
identify the cells/values where it changes from increasing to decreasing and
vice versa. I know this must be a IF statement, but I need some help. Thanks.

Example
1
2
3
4 This is a peak
3
2This is a trough
4
5
6
7
8 This is a peak
7
6
Etc.