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calculate the p-value for a negative t-value
My question is how can I calculate a p-value for a negative t-value?
In several tests the t-test value is negative and I cannot use the standard TDIST(x,df,1) function. Is it correct to calculate the p-value of negative t-values as: 1 - absolute(P[x])? If the above is correct, is this the correct adaption to the TDIST function: =IF(x0,TDIST(x,deg_freedom,tails),(1-(TDIST(ABS(x),deg_freedom,tails)))) -- Mahalo for your help, Camper |
#2
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calculate the p-value for a negative t-value
Camper -
Here are some excerpts from my book, "Data Analysis Using Microsoft Excel: Updated for Office XP": Left-Tail Test p-value =IF(t<0,TDIST(ABS(t),df,1),1-TDIST(t,df,1)) Right-Tail Test p-value =IF(t0,TDIST(t,df,1),1-TDIST(ABS(t),df,1)) Two-Tail Test p-value =TDIST(ABS(t),df,2) - Mike www.mikemiddleton.com "Camper" wrote in message ... My question is how can I calculate a p-value for a negative t-value? In several tests the t-test value is negative and I cannot use the standard TDIST(x,df,1) function. Is it correct to calculate the p-value of negative t-values as: 1 - absolute(P[x])? If the above is correct, is this the correct adaption to the TDIST function: =IF(x0,TDIST(x,deg_freedom,tails),(1-(TDIST(ABS(x),deg_freedom,tails)))) -- Mahalo for your help, Camper |
#3
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calculate the p-value for a negative t-value
Aloha Mike,
That answers my question and is exactly what I needed. Mahalo for the reference to the book. I will have to track down a copy for my library/reference collection. -- Mahalo for your help, Camper "Mike Middleton" wrote: Camper - Here are some excerpts from my book, "Data Analysis Using Microsoft Excel: Updated for Office XP": Left-Tail Test p-value =IF(t<0,TDIST(ABS(t),df,1),1-TDIST(t,df,1)) Right-Tail Test p-value =IF(t0,TDIST(t,df,1),1-TDIST(ABS(t),df,1)) Two-Tail Test p-value =TDIST(ABS(t),df,2) - Mike www.mikemiddleton.com "Camper" wrote in message ... My question is how can I calculate a p-value for a negative t-value? In several tests the t-test value is negative and I cannot use the standard TDIST(x,df,1) function. Is it correct to calculate the p-value of negative t-values as: 1 - absolute(P[x])? If the above is correct, is this the correct adaption to the TDIST function: =IF(x0,TDIST(x,deg_freedom,tails),(1-(TDIST(ABS(x),deg_freedom,tails)))) -- Mahalo for your help, Camper |
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