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#1
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![]() Hello, I have a worksheet that has all weekday dates in column 1 and values in column 2. I want to create a 30-day moving average based on the last (non-zero) value in the column 2. Since every month has a different amount of days, I want it to search the date that has the last value (since I don't get a chance to update it daily) and go back thirsty days from that date and give an average of all the column 2 values skipping and values that are null or zero. Any ideas? Thanks, Gimi -- gimiv ------------------------------------------------------------------------ gimiv's Profile: http://www.excelforum.com/member.php...o&userid=35726 View this thread: http://www.excelforum.com/showthread...hreadid=558670 |
#2
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![]() Someone will probably have something better. However, here is a possibility in the meantime. I'm assuming Row 1 has your titles and Column A refers to your Column 1 and Column B to Column 2. I'd put the following function in Column C: (Find the last date with a value) =A2 (For Cell C2) =IF(B3<0,A3,C2) (For the rest) I'd put the following function in Column D: =(SUMIF($A$2:A2,"<="&C2,$B$2:B2)-SUMIF($A$2:A2,"<"&C2-29,$B$2:B2)) / (COUNTIF($A$2:A2,"<="&C2)-COUNTIF($A$2:A2,"<"&C2-29)) If this isn't what you meant, you'll have to explain some more. Scott gimiv Wrote: Hello, I have a worksheet that has all weekday dates in column 1 and values in column 2. I want to create a 30-day moving average based on the last (non-zero) value in the column 2. Since every month has a different amount of days, I want it to search the date that has the last value (since I don't get a chance to update it daily) and go back thirsty days from that date and give an average of all the column 2 values skipping and values that are null or zero. Any ideas? Thanks, Gimi -- Maistrye ------------------------------------------------------------------------ Maistrye's Profile: http://www.excelforum.com/member.php...o&userid=36078 View this thread: http://www.excelforum.com/showthread...hreadid=558670 |
#3
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Assume your last row is 1000
Then your average of the value in the second column for the last 30 days would be: =Average(Offset(B1000,0,0,-30,1)) "gimiv" wrote: Hello, I have a worksheet that has all weekday dates in column 1 and values in column 2. I want to create a 30-day moving average based on the last (non-zero) value in the column 2. Since every month has a different amount of days, I want it to search the date that has the last value (since I don't get a chance to update it daily) and go back thirsty days from that date and give an average of all the column 2 values skipping and values that are null or zero. Any ideas? Thanks, Gimi -- gimiv ------------------------------------------------------------------------ gimiv's Profile: http://www.excelforum.com/member.php...o&userid=35726 View this thread: http://www.excelforum.com/showthread...hreadid=558670 |
#4
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gimiv wrote:
Hello, I have a worksheet that has all weekday dates in column 1 and values in column 2. I want to create a 30-day moving average based on the last (non-zero) value in the column 2. Since every month has a different amount of days, I want it to search the date that has the last value (since I don't get a chance to update it daily) and go back thirsty days from that date and give an average of all the column 2 values skipping and values that are null or zero. The solution might be a lot simpler than you might think. But your description leaves me with several questions, so I am not sure. Does the following paradigm work for you? Assume your data starts in B2. The first 30 days of data are in B2:B31, some cells of which might be zero presumably because you "did not get a chance to update it daily". It appears that you want the following average, entered into C31 perhaps: =sumif(B2:B31,"<0") / countif(B2:B31,"<0") If you copy that down the column, the range will automatically be a moving 30-day period; for example, B3:B32, B4:B33, etc. Thus, it creates a trailing simple moving average, ignoring cells with zero. |
#5
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Assuming that Column B contains the data, try...
=AVERAGE(IF(ROW(B2:B1000)=LARGE(IF(B2:B1000,ROW(B 2:B1000)),30),IF(B2:B10 00,B2:B1000))) ....confirmed with CONTROL+SHIFT+ENTER, not just ENTER. Hope this helps! In article , gimiv wrote: Hello, I have a worksheet that has all weekday dates in column 1 and values in column 2. I want to create a 30-day moving average based on the last (non-zero) value in the column 2. Since every month has a different amount of days, I want it to search the date that has the last value (since I don't get a chance to update it daily) and go back thirsty days from that date and give an average of all the column 2 values skipping and values that are null or zero. Any ideas? Thanks, Gimi |
#6
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wrote:
gimiv wrote: values skipping and values that are null or zero. [....] =sumif(B2:B31,"<0") / countif(B2:B31,"<0") I just realized that you said skipping cells that are zero __or_null__. In that case, you might want: =sumif(B2:B31,"<0") / (counta(B2:B31) - countif(B2:B31,"=0")) |
#7
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![]() However, so far none of these have worked. More specifically, My moving average formula will reside on another worksheet and should change every time I add a new row. I want to avoid a static calculation that I have to re-reference every time. Thanks again, Gimiv -- gimiv ------------------------------------------------------------------------ gimiv's Profile: http://www.excelforum.com/member.php...o&userid=35726 View this thread: http://www.excelforum.com/showthread...hreadid=558670 |
#8
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![]() gimiv Wrote: However, so far none of these have worked. More specifically, My moving average formula will reside on another worksheet and should change every time I add a new row. I want to avoid a static calculation that I have to re-reference every time. Thanks again, Gimiv On the sheet with the data (or elsewhere, depends on what you want), put the following: D1: Last Date D2: =DMAX(A:B,"Date",E1:E2) E1: Value E2: 0 F1: Date F2: ="<="&D2 G1: Date G2: =""&D2-30 H1: 30-Day Average H2: =DAVERAGE(A:B,"Value",E1:G2) Then, on the sheet you want to know the 30-Day Average, just reference this sheet's H2 cell. Scott -- Maistrye ------------------------------------------------------------------------ Maistrye's Profile: http://www.excelforum.com/member.php...o&userid=36078 View this thread: http://www.excelforum.com/showthread...hreadid=558670 |
#9
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In article ,
gimiv wrote: However, so far none of these have worked. 1) Did you confirm the formula with CONTROL+SHIFT+ENTER, not just ENTER. 2) Are you receiving an error message or an incorrect result? If the former, what type of error value are you getting? More specifically, My moving average formula will reside on another worksheet and should change every time I add a new row. I want to avoid a static calculation that I have to re-reference every time. For this you can use a dynamic named range. Do you need help with this? |
#10
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![]() For this you can use a dynamic named range. Do you need help with this? Inserting it into an OFFSET in your equation? yes. = ) thanks again for your help guys. -- gimiv ------------------------------------------------------------------------ gimiv's Profile: http://www.excelforum.com/member.php...o&userid=35726 View this thread: http://www.excelforum.com/showthread...hreadid=558670 |
#11
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Assuming that Sheet1, Column B, starting at B2, contains the data, try
the following... 1) Define the following dynamic named range: Insert Name Define Name: Values Refers to: =Sheet1!$B$2:INDEX(Sheet1!$B$2:$B$65536,MATCH(9.99 999999999999E+307,Sheet 1!$B$2:$B$65536)) Click Ok Change the references accordingly. 2) Then try the following formula, which needs to be confirmed with CONTROL+SHIFT+ENTER... =AVERAGE(IF(ROW(Values)=LARGE(IF(Values,ROW(Value s)),30),IF(Values,Value s))) Hope this helps! In article , gimiv wrote: For this you can use a dynamic named range. Do you need help with this? Inserting it into an OFFSET in your equation? yes. = ) thanks again for your help guys. |
#12
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Note to the OP:
If you have less than 30 values < 0 you'll get a #NUM! error. Biff "Domenic" wrote in message ... Assuming that Sheet1, Column B, starting at B2, contains the data, try the following... 1) Define the following dynamic named range: Insert Name Define Name: Values Refers to: =Sheet1!$B$2:INDEX(Sheet1!$B$2:$B$65536,MATCH(9.99 999999999999E+307,Sheet 1!$B$2:$B$65536)) Click Ok Change the references accordingly. 2) Then try the following formula, which needs to be confirmed with CONTROL+SHIFT+ENTER... =AVERAGE(IF(ROW(Values)=LARGE(IF(Values,ROW(Value s)),30),IF(Values,Value s))) Hope this helps! In article , gimiv wrote: For this you can use a dynamic named range. Do you need help with this? Inserting it into an OFFSET in your equation? yes. = ) thanks again for your help guys. |
#13
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Thanks Biff! Where do I send my cheque... <VBG
In article , "Biff" wrote: Note to the OP: If you have less than 30 values < 0 you'll get a #NUM! error. Biff |
#14
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![]() Biff Wrote: Note to the OP: If you have less than 30 values < 0 you'll get a #NUM! error. Biff "Domenic" wrote in message ... Assuming that Sheet1, Column B, starting at B2, contains the data, try the following... 1) Define the following dynamic named range: Insert Name Define Name: Values Refers to: =Sheet1!$B$2:INDEX(Sheet1!$B$2:$B$65536,MATCH(9.99 999999999999E+307,Sheet 1!$B$2:$B$65536)) Click Ok Change the references accordingly. 2) Then try the following formula, which needs to be confirmed with CONTROL+SHIFT+ENTER... =AVERAGE(IF(ROW(Values)=LARGE(IF(Values,ROW(Value s)),30),IF(Values,Value s))) Hope this helps! In article , gimiv wrote: For this you can use a dynamic named range. Do you need help with this? Inserting it into an OFFSET in your equation? yes. = ) thanks again for your help guys. Wow, this worked perfectly. Hate to be a pain, but can you explain how you went about the logic to achieve this statement or does that just come with years and years of experience. I mean, to be able to identify the problem and match it to the right complex formula? -- gimiv ------------------------------------------------------------------------ gimiv's Profile: http://www.excelforum.com/member.php...o&userid=35726 View this thread: http://www.excelforum.com/showthread...hreadid=558670 |
#15
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In article ,
gimiv wrote: Wow, this worked perfectly. Hate to be a pain, but can you explain how you went about the logic to achieve this statement or does that just come with years and years of experience. I mean, to be able to identify the problem and match it to the right complex formula? Basically, I watch and learn from others who are more experienced. It's amazing what one can learn by frequenting these newsgroups, forums, etc... |
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