R Calculate Critical Values of Student’s t-Distribution (2 Examples)

In this article you’ll learn how to calculate critical t-values in the R programming language.

Example 1: Critical t-Statistic of 1-Sided t-Test

abs(qt(0.01, 1))            # 1-sided 99% confidence level, 1 DF
# [1] 31.82052

Example 2: Critical t-Statistic of 2-Sided t-Test

abs(qt(0.01 / 2, 1))        # 2-sided 99% confidence level, 1 DF
# [1] 63.65674