TD_ZTest Output - Analytics Database

Database Analytic Functions
Deployment
VantageCloud
VantageCore
Edition
VMware
Enterprise
IntelliFlex
Product
Analytics Database
Release Number
17.20
Published
June 2022
ft:locale
en-US
ft:lastEdition
2025-11-06
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jmh1512506877710
Product Category
Teradata Vantage™

Output Table Schema

Column Data Type Description
sample_column_1 VARCHAR Data for first sample population.
sample_column_2 VARCHAR [Column appears only if you specify SecondSampleColumn.]

Data for second sample population.
N1 INTEGER Size of first sample.
N2 INTEGER [Column appears only if you specify SecondSampleColumn.]

Size of second sample.
mean1 DOUBLE PRECISION Mean of first sample.
mean2 DOUBLE PRECISION [Column appears only if you specify SecondSampleColumn.]

Mean of second sample.
AlternativeHypothesis VARCHAR Hypothesis accepted if null hypothesis is rejected (H1).
z_score DOUBLE PRECISION Test statistic z score.
Alpha DOUBLE PRECISION Alpha value (see Required Syntax Elements for TD_ZTest).
CriticalValue DOUBLE PRECISION Critical value calculated using Alpha for test (z_α).
p_value DOUBLE PRECISION Probability associated with Z-test statistic:
  • One-tailed, lower-tailed test:

    This is the lower-tail probability under normal distribution.

  • One-tailed, upper-tailed test:

    This is the upper-tail probability under normal distribution.

  • Two-tailed test:

If p_value is less than alpha, reject null hypothesis.
Conclusion VARCHAR Z-test result, either 'reject null hypothesis' or 'fail to reject null hypothesis'.

If Conclusion is 'reject null hypothesis', rejection confidence level is 1-alpha.