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#1
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exluding missing data values from equation
We are required to specify why data is missing and we have therefore given it
a number value (eg 999 for missing, 777 for not applicable). However we need to be able to exclude these values from the final calculation in order to get the correct answer. What can we do??? |
#2
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exluding missing data values from equation
What kind of calculations?
Biff "tam25" wrote in message ... We are required to specify why data is missing and we have therefore given it a number value (eg 999 for missing, 777 for not applicable). However we need to be able to exclude these values from the final calculation in order to get the correct answer. What can we do??? |
#3
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exluding missing data values from equation
Mostly summing, some averaging, some reverse scoring (converting a response
from 5 to 1 or 1 to 5). "T. Valko" wrote: What kind of calculations? Biff "tam25" wrote in message ... We are required to specify why data is missing and we have therefore given it a number value (eg 999 for missing, 777 for not applicable). However we need to be able to exclude these values from the final calculation in order to get the correct answer. What can we do??? |
#4
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exluding missing data values from equation
How can you distinguish between a "mask value" and a real value?
As you say, you use the mask, 999, for missing. What if there is a real value of 999, how can you tell them apart? You'd need to make a list of all the mask values: G1 = 999 G2 = 888 G3 = 777 Then, with this sample data: A1 = 999 A2 = 101 A3 = 214 A4 = 888 A5 = 300 Sum excluding mask values: =SUMPRODUCT(--(ISNA(MATCH(A1:A5,G1:G3,0))),A1:A5) Average excluding mask values (entered as an array using the key combination of CTRL,SHIFT,ENTER (not just ENTER)): =AVERAGE(IF(ISNA(MATCH(A1:A5,G1:G3,0)),A1:A5)) some reverse scoring I have no idea what you mean by that! Biff "tam25" wrote in message ... Mostly summing, some averaging, some reverse scoring (converting a response from 5 to 1 or 1 to 5). "T. Valko" wrote: What kind of calculations? Biff "tam25" wrote in message ... We are required to specify why data is missing and we have therefore given it a number value (eg 999 for missing, 777 for not applicable). However we need to be able to exclude these values from the final calculation in order to get the correct answer. What can we do??? |
#5
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exluding missing data values from equation
You could try entering the values you don't want to sum as text (with
a leading apostrophe e.g. '123). On Jan 28, 5:17 am, tam25 wrote: We are required to specify why data is missing and we have therefore given it a number value (eg 999 for missing, 777 for not applicable). However we need to be able to exclude these values from the final calculation in order to get the correct answer. What can we do??? |
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