Learn how to Usefulness the TINV Serve as in SAS (With Examples)

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You’ll importance the TINV serve as in SAS to search out vital values from the t distribution.

This serve as makes use of please see modest syntax:

TINV(p, df)

the place:

  • p: 1 – the utility stage
  • df: The levels of sovereignty

Refer to instance presentations how one can importance the TINV serve as to search out the t vital worth for a left-tailed take a look at, right-tailed take a look at, and a two-tailed take a look at.

Instance 1: The usage of TINV Serve as for Left-Tailed Check

Assume we need to to find the t vital worth for a left-tailed take a look at with a utility stage of .05 and levels of sovereignty = 22:

We will be able to importance the TINV serve as to calculate this worth:

/*manufacture dataset that incorporates t vital worth*/
knowledge my_data;
    critical_val=tinv(.05, 22);
    put critical_val=;
run;

/*view effects*/
proc print knowledge=my_data;

The t vital worth for a utility stage of 0.05 and levels of sovereignty = 22 is -1.71714.

Thus, if the take a look at statistic is not up to this worth next the result of the take a look at are statistically important.

Instance 2: The usage of TINV Serve as for Proper-Tailed Check

Assume we need to to find the t vital worth for a right-tailed take a look at with a utility stage of .05 and levels of sovereignty = 22:

We will be able to importance the TINV serve as to calculate this worth:

/*manufacture dataset that incorporates t vital worth*/
knowledge my_data;
    critical_val=tinv(.95, 22);
    put critical_val=;
run;

/*view effects*/
proc print knowledge=my_data;

The t vital worth for a utility stage of 0.05 and levels of sovereignty = 22 is 1.71714.

Thus, if the take a look at statistic is larger than this worth next the result of the take a look at are statistically important.

Instance 3: The usage of TINV Serve as for Two-Tailed Check

Assume we need to to find the t vital worth for a two-tailed take a look at with a utility stage of .05 and levels of sovereignty = 22:

We will be able to importance the TINV serve as to calculate this worth:

/*manufacture dataset that incorporates t vital worth*/
knowledge my_data;
    critical_val=tinv(.05/2, 22);
    put critical_val=;
run;

/*view effects*/
proc print knowledge=my_data;

On every occasion you carry out a two-tailed take a look at, there shall be two vital values. On this case, the t vital values are -2.07387 and 2.07387.

Thus, if the take a look at statistic is not up to -2.0739 or more than 2.0739 next the result of the take a look at are statistically important.

Supplementary Sources

Refer to tutorials provide an explanation for how one can carry out alternative usual duties in SAS:

Learn how to Carry out a One Pattern t-Check in SAS
Learn how to Carry out a Two Pattern t-Check in SAS
Learn how to Carry out a Paired Samples t-Check in SAS

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