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#1
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Help with Forecasting function?
Help with a forecast function.
I am trying to figure out how to calculate the number value to increase my percentage from whatever it is currently to 95%. I have 3 pieces of data, good records, nuetral records, and bad records. In cell 1a I have the % of cells b1, c1, d1. Here is my calc: =(b1/SUM(b1:d1) a1 b1 c1 d1 87% 20 2 1 I am trying to figure out how many more of B1 I need to reach a goal of 95% in cell a1. My answer in this case is 32 more, which I want to display in cell e1. How can I do this? TIA, Bob W. |
#2
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Help with Forecasting function?
If "T" is 0.95, then
= (B1-SUM(B1:D1)*T)/(T - 1) returns an answer of 37. You need to increase B1 by 37 to get a percentage of 95%. (32 gives an "rounded" solution of 95%) -- HTH. :) Dana DeLouis Windows XP, Office 2003 "me" wrote in message . com... Help with a forecast function. I am trying to figure out how to calculate the number value to increase my percentage from whatever it is currently to 95%. I have 3 pieces of data, good records, nuetral records, and bad records. In cell 1a I have the % of cells b1, c1, d1. Here is my calc: =(b1/SUM(b1:d1) a1 b1 c1 d1 87% 20 2 1 I am trying to figure out how many more of B1 I need to reach a goal of 95% in cell a1. My answer in this case is 32 more, which I want to display in cell e1. How can I do this? TIA, Bob W. |
#3
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Help with Forecasting function?
Dana,
You rock. I've spent about 3-4hrs looking for the correct calc and you've helped me a great deal. Thanks, Bob W. "Dana DeLouis" wrote in message ... If "T" is 0.95, then = (B1-SUM(B1:D1)*T)/(T - 1) returns an answer of 37. You need to increase B1 by 37 to get a percentage of 95%. (32 gives an "rounded" solution of 95%) -- HTH. :) Dana DeLouis Windows XP, Office 2003 "me" wrote in message . com... Help with a forecast function. I am trying to figure out how to calculate the number value to increase my percentage from whatever it is currently to 95%. I have 3 pieces of data, good records, nuetral records, and bad records. In cell 1a I have the % of cells b1, c1, d1. Here is my calc: =(b1/SUM(b1:d1) a1 b1 c1 d1 87% 20 2 1 I am trying to figure out how many more of B1 I need to reach a goal of 95% in cell a1. My answer in this case is 32 more, which I want to display in cell e1. How can I do this? TIA, Bob W. |
#4
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Help with Forecasting function?
Glad to help. :)
As a side note, if you are increasing B1 by 'x', then the solution is to solve for 'x' in the following equation: 0.95 = (B1+x)/((B1+x)+C1+D1) HTH. :) -- Dana DeLouis "me" wrote in message . com... Dana, You rock. I've spent about 3-4hrs looking for the correct calc and you've helped me a great deal. Thanks, Bob W. "Dana DeLouis" wrote in message ... If "T" is 0.95, then = (B1-SUM(B1:D1)*T)/(T - 1) returns an answer of 37. You need to increase B1 by 37 to get a percentage of 95%. (32 gives an "rounded" solution of 95%) -- HTH. :) Dana DeLouis Windows XP, Office 2003 "me" wrote in message . com... Help with a forecast function. I am trying to figure out how to calculate the number value to increase my percentage from whatever it is currently to 95%. I have 3 pieces of data, good records, nuetral records, and bad records. In cell 1a I have the % of cells b1, c1, d1. Here is my calc: =(b1/SUM(b1:d1) a1 b1 c1 d1 87% 20 2 1 I am trying to figure out how many more of B1 I need to reach a goal of 95% in cell a1. My answer in this case is 32 more, which I want to display in cell e1. How can I do this? TIA, Bob W. |
#5
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Help with Forecasting function?
Dana DeLouis wrote...
As a side note, if you are increasing B1 by 'x', then the solution is to solve for 'x' in the following equation: 0.95 = (B1+x)/((B1+x)+C1+D1) .... A little algebra makes this simpler. 0.95 = 1 / [(B1+x) / (B1+x) + (C1+D1) / (B1+x)] 1 / 0.95 = 1 + (C1+D1) / (B1 + x) 1 / (1 / 0.95 - 1) = (B1 + x) / (C1 + D1) (C1 + D1) / (1 / 0.95 - 1) = B1 + x x = (C1 + D1) / (1 / 0.95 - 1) - B1 |
#6
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Help with Forecasting function?
Thanks Harlan! I totally missed that one. :(
Your equation gives the op a nice whole number to this particular problem also if he wishes. =19*(C1+D1)-B1 where the '19 comes from: 0.95/(1 - 0.95) Anyway, thanks again. :) -- Dana DeLouis "Harlan Grove" wrote in message ups.com... Dana DeLouis wrote... As a side note, if you are increasing B1 by 'x', then the solution is to solve for 'x' in the following equation: 0.95 = (B1+x)/((B1+x)+C1+D1) ... A little algebra makes this simpler. 0.95 = 1 / [(B1+x) / (B1+x) + (C1+D1) / (B1+x)] 1 / 0.95 = 1 + (C1+D1) / (B1 + x) 1 / (1 / 0.95 - 1) = (B1 + x) / (C1 + D1) (C1 + D1) / (1 / 0.95 - 1) = B1 + x x = (C1 + D1) / (1 / 0.95 - 1) - B1 |
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