Selecting a max date for rows that are in the same group

[Aaronsmity]

I have some more than one date (column b) for a single group (column A) and I am trying to get it to go through the groups and determine the max date for that group..

for example for group 1 the max date would be 7/22/2011.. for group 2 it would be 07/02/2011 etc.. I need it to determine the max date and put something in the Flag field in column C for the row with the max date for the group.

any help is appreciated, thanks

grp ValidFrDt Flag
1 7/1/2009
1 7/29/2010
1 7/22/2011
2 4/14/2011
2 7/02/2011
3 5/1/2008
3 12/1/2009
4 7/29/2010
4 7/22/2011
5 7/20/2010
5 7/22/2011
5 7/30/2010
5 7/28/2011

 

[markmzz]

Maybe this (array formula - use Ctrl+Shift+Enter and not only Enter):

<b>Excel 2007</b><table cellpadding="2.5px" rules="all" style=";background-color: #FFFFFF;border: 1px solid;border-collapse: collapse; border-color: #A6AAB6"><colgroup><col width="25px" style="background-color: #E0E0F0" /><col /><col /><col /></colgroup><thead><tr style=" background-color: #E0E0F0;text-align: center;color: #161120"><th></th><th>A</th><th>B</th><th>C</th></tr></thead><tbody><tr ><td style="color: #161120;text-align: center;">1</td><td style="text-align: center;;">grp</td><td style="text-align: center;;">ValidFrDt</td><td style="text-align: center;;">Flag</td></tr><tr ><td style="color: #161120;text-align: center;">2</td><td style="text-align: center;;">1</td><td style="text-align: center;;">7/1/2009</td><td style="text-align: center;;"></td></tr><tr ><td style="color: #161120;text-align: center;">3</td><td style="text-align: center;;">1</td><td style="text-align: center;;">7/29/2010</td><td style="text-align: center;;"></td></tr><tr ><td style="color: #161120;text-align: center;">4</td><td style="text-align: center;;">1</td><td style="text-align: center;;">7/22/2011</td><td style="text-align: center;;">Max</td></tr><tr ><td style="color: #161120;text-align: center;">5</td><td style="text-align: center;;">2</td><td style="text-align: center;;">4/14/2011</td><td style="text-align: center;;"></td></tr><tr ><td style="color: #161120;text-align: center;">6</td><td style="text-align: center;;">2</td><td style="text-align: center;;">7/2/2011</td><td style="text-align: center;;">Max</td></tr><tr ><td style="color: #161120;text-align: center;">7</td><td style="text-align: center;;">3</td><td style="text-align: center;;">5/1/2008</td><td style="text-align: center;;"></td></tr><tr ><td style="color: #161120;text-align: center;">8</td><td style="text-align: center;;">3</td><td style="text-align: center;;">12/1/2009</td><td style="text-align: center;;">Max</td></tr><tr ><td style="color: #161120;text-align: center;">9</td><td style="text-align: center;;">4</td><td style="text-align: center;;">7/29/2010</td><td style="text-align: center;;"></td></tr><tr ><td style="color: #161120;text-align: center;">10</td><td style="text-align: center;;">4</td><td style="text-align: center;;">7/22/2011</td><td style="text-align: center;;">Max</td></tr><tr ><td style="color: #161120;text-align: center;">11</td><td style="text-align: center;;">5</td><td style="text-align: center;;">7/20/2010</td><td style="text-align: center;;"></td></tr><tr ><td style="color: #161120;text-align: center;">12</td><td style="text-align: center;;">5</td><td style="text-align: center;;">7/22/2011</td><td style="text-align: center;;"></td></tr><tr ><td style="color: #161120;text-align: center;">13</td><td style="text-align: center;;">5</td><td style="text-align: center;;">7/30/2010</td><td style="text-align: center;;"></td></tr><tr ><td style="color: #161120;text-align: center;">14</td><td style="text-align: center;;">5</td><td style="text-align: center;;">7/28/2011</td><td style="text-align: center;;">Max</td></tr><tr ><td style="color: #161120;text-align: center;">15</td><td style="text-align: center;;"></td><td style="text-align: center;;"></td><td style="text-align: center;;"></td></tr><tr ><td style="color: #161120;text-align: center;">16</td><td style="text-align: center;;">********</td><td style="text-align: center;;">********</td><td style="text-align: center;;">********</td></tr></tbody></table><p style="width:3.6em;font-weight:bold;margin:0;padding:0.2em 0.6em 0.2em 0.5em;border: 1px solid #A6AAB6;border-top:none;text-align: center;background-color: #E0E0F0;color: #161120">Sheet4</p><br /><br /><table width="85%" cellpadding="2.5px" rules="all" style=";border: 2px solid black;border-collapse:collapse;padding: 0.4em;background-color: #FFFFFF" ><tr><td style="padding:6px" ><b>Array Formulas</b><table cellpadding="2.5px" width="100%" rules="all" style="border: 1px solid;text-align:center;background-color: #FFFFFF;border-collapse: collapse; border-color: #A6AAB6"><thead><tr style=" background-color: #E0E0F0;color: #161120"><th width="10px">Cell</th><th style="text-align:left;padding-left:5px;">Formula</th></tr></thead><tbody><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">C2</th><td style="text-align:left">{=IF(<font color="Blue">B2=MAX(<font color="Red">IF(<font color="Green">A2=A$2:A$14,B$2:B$14</font>)</font>),"Max",""</font>)}</td></tr></tbody></table><b>Entered with Ctrl+Shift+Enter.</b> If entered correctly, Excel will surround with curly braces {}.
<b>Note: Do not try and enter the {} manually yourself</b></td></tr></table><br />
Markmzz

 

[Aaronsmity]

thanks, that worked great!

 

[markmzz]

thanks, that worked great!

Thanks for the feedback.

Markmzz