Return date associated with maximum value

This question relates to the same data set from a previous question: http://www.experts-exchange.com/Software/Office_Productivity/Office_Suites/MS_Office/Excel/Q_28363479.html

For each "Site", I would like to obtain the value for "SampDate" associated with the maximum values in columns H, I, and J. The results should appear in columns K, L, and M.

I think that VLOOKUP may be able to do this, but I am unsure of the proper syntax.

Many thanks in advance for any potential solutions!
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dougf1rAsked:
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barry houdiniCommented:
Hello dougflr,

I used this "array formula" in K5 confirmed with CTRL+SHIFT+ENTER and copied across 3 columns and all the way down.

=IF(AND($J4="",$J5<>""),INDEX($C5:$C200,MATCH(MAX(IF($B5:$B200=$B5,H5:H200)),H5:H200,0)),"")

That will give you the SampDate associated with the max value on the first row of average data for each site.

To "array enter" a formula you can put the formula in a cell, select that cell and press F2 key to select formula - now hold down CTRL and SHIFT keys and press ENTER. If done correctly curly braces will appear around the formula. If you change the formula this needs to be re-done....but only for first formula - it can then be copied

See attached

regards, barry
maxdate-barry.xlsx
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dougf1rAuthor Commented:
To clarify, the ranges of data from which to search for the maximum values for each site are in columns H, I, and J. For example, for the first site (04CEF-1) I would like to be able to identify the SampDate associated with the maximum value from the range of values in rows 5 through 90 for each column H, I, and J.
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dougf1rAuthor Commented:
Thanks barry! This works perfectly.
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