Average last 120 values in a column of 850

[SimonHughes]

I have a data set of 850 rows which expands each day. How do I average the values for the last 120 days where the entry is greater than 0? The table here is just to show the simplicity of the dataset.

I am using Excel 2010 on Win7. YOur help appreciated

<TABLE style="WIDTH: 124pt; BORDER-COLLAPSE: collapse" border=0 cellSpacing=0 cellPadding=0 width=165><COLGROUP><COL style="WIDTH: 71pt; mso-width-source: userset; mso-width-alt: 3437" width=94><COL style="WIDTH: 53pt; mso-width-source: userset; mso-width-alt: 2596" width=71><TBODY><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: yellow; WIDTH: 71pt; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl64 height=17 width=94>Day Number</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: yellow; WIDTH: 53pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl64 width=71>Bookings</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 71pt; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17 width=94 align=right>1</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 53pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 width=71 align=right>£14,000.34</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 71pt; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17 width=94 align=right>2</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 53pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 width=71 align=right>£16,611.75</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 71pt; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17 width=94 align=right>3</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 53pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 width=71 align=right>£40,424.17</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 71pt; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17 width=94 align=right>4</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 53pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 width=71 align=right>£25,930.69</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 71pt; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17 width=94 align=right>5</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 53pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 width=71 align=right>£5,187.53</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 71pt; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17 width=94 align=right>6</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 53pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 width=71 align=right>£13,636.59</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 71pt; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17 width=94 align=right>7</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 53pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 width=71 align=right>£0.00</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 71pt; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17 width=94 align=right>8</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 53pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 width=71 align=right>£0.00</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 71pt; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17 width=94 align=right>9</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 53pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 width=71 align=right>£0.00</TD></TR></TBODY></TABLE>

 

[Asala42]

How about something like:

=SUM(OFFSET($B$1,COUNTA($B$1:$B$10000)-120,0,120,1))/COUNTIF(OFFSET($B$1,COUNTA($B$1:$B$10000)-120,0,120,1),">"&0)

 

[SimonHughes]

How about something like:

=SUM(OFFSET($B$1,COUNTA($B$1:$B$10000)-120,0,120,1))/COUNTIF(OFFSET($B$1,COUNTA($B$1:$B$10000)-120,0,120,1),">"&0)

Hi Asala, that works just fine, many thanks. I did some work on this and put in days from and days to (last day minum 120 and last day) and used this formula =AVERAGE(INDEX($A$3:$B$1218,E3,2):INDEX($A$3:$B$1218,F3,2)) which also works but I prefer yours as no helper columns are needed.

Much appreciated.

 

[Asala42]

Awesome! Thanks for the feedback