Difference between revisions of "Manuals/calci/TTEST"
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*<math> Tails </math> is the number of distribution tails. | *<math> Tails </math> is the number of distribution tails. | ||
*<math> Type </math> is the type of t-test. | *<math> Type </math> is the type of t-test. | ||
| − | + | **TTEST() returns the probability associated with a Students t-test. | |
==Description== | ==Description== | ||
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*It is also called student's t-test. | *It is also called student's t-test. | ||
*This function is used to find the probability of two samples having the same mean but equal or unequal variances. | *This function is used to find the probability of two samples having the same mean but equal or unequal variances. | ||
| − | *In TTEST(Array1,Array2,Tails,Type), Array1 and Array2 are two set of array values. | + | *In <math>TTEST(Array1,Array2,Tails,Type)</math>, <math>Array1</math> and <math>Array2</math> are two set of array values. |
*ta is indicating the number of distribution tails. ta value is either 1 or 2. | *ta is indicating the number of distribution tails. ta value is either 1 or 2. | ||
*If Tails=1,then TTEST uses the one-tailed distribution.If Tails=2, then TTEST uses the two-tailed distribution. Type is the type of t-Test. Type value is 1 or 2 or 3. | *If Tails=1,then TTEST uses the one-tailed distribution.If Tails=2, then TTEST uses the two-tailed distribution. Type is the type of t-Test. Type value is 1 or 2 or 3. | ||
Latest revision as of 14:45, 18 June 2018
TTEST(Array1,Array2,Tails,Type)
- and are the array of values.
- is the number of distribution tails.
- is the type of t-test.
- TTEST() returns the probability associated with a Students t-test.
and 
are the array of values.
is the number of distribution tails.
is the type of t-test.
Description
- This function gives the probability of the t-test.
- It is also called student's t-test.
- This function is used to find the probability of two samples having the same mean but equal or unequal variances.
- In , and are two set of array values.
- ta is indicating the number of distribution tails. ta value is either 1 or 2.
- If Tails=1,then TTEST uses the one-tailed distribution.If Tails=2, then TTEST uses the two-tailed distribution. Type is the type of t-Test. Type value is 1 or 2 or 3.
, | Type value | t-Test is performed |
| 1 | Paired |
| 2 | Two-sample equal variance |
| 3 | Two-sample unequal variance |
- Suppose we are giving ta and ty in decimals , then it will converted in to integers.
- TTEST uses the value of Array1 and Array2 to find non-negative t-statistic.
- If Tails=1, then it gives the probability of a higher value of the t-statistic with consideration of two arrays of samples with the same mean.
- If Tails=2, then TTEST is gives double that when ta=1 and corresponds to the probability of a higher absolute value of the t-statistic with the consideration of same mean.
This function will give the result as error when
1. Array1 and Array2 have a different number of data points and Type=1.
2. Any one of the argument is nonnumeric.
3. Tails>2 and Type>3.
Examples
| A | B | C | D | E | F | G | |
|---|---|---|---|---|---|---|---|
| 1 | 3 | 5 | 14 | 10 | 8 | 2 | 15 |
| 2 | 11 | 19 | 5 | 4 | 15 | 7 | 3 |
- =TTEST(A1:G1,A2:G2,1,1)=0.399108571503
- =TTEST(A1:G1,A2:G2,2,1)=0.7982171430076
- =TTEST(A1:G1,A2:G2,1,2)=0.3725946027453
- =TTEST(A1:G1,A2:G2,2,2)=0.7451892054907
- =TTEST(A1:G1,A2:G2,1,3) = 0.37285157760157517
- =TTEST(A1:G1,A2:G2,2,3) = 0.7457031552031503
- =TTEST(A1:G1,A2:G2,2.2,1.3) = NAN
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References