Keng 2026.3.19

• power_r, power_lm(), print.Keng_power(), and plot.Keng_power() have been rewritten using uniroot().

Keng 2026.1.5

• Scale() has been rewritten.
• divide() has been added to divide a vector into three groups.

Keng 2025.10.8

• The bug of length(...) has been fixed.
• powered_r() and powered_lm() are used to compute powers, and power_r() and power_lm() have been rewritten.

Keng 2025.9.1

• The codes for pick_* tools have been refined.
• assess_coa() has been added to assess course objective achievement in Outcome-Based Education.

Keng 2025.8.16

• pick_sl() and pick_dcb() have been added to randomly pick numbers for Chinese Super Lotto and Double Color Balls.

Keng 2025.02.05

• Some spelling errors have been corrected.

Keng 2024.12.15

• power_r() has been added to conduct post-hoc and a priori power analysis, and plan the sample size for Pearson’s r.
• power_lm() has reorganized its output.
• power_r() and power_lm() return the Keng_power class, which has print() and plot() methods.

Keng 2024.11.25

• test_r() has added Fisher’s z.
• compare_lm() has added f_squared and post-hoc power.
• calc_PRE() has been added to calculate PRE from partial correlation, Cohen’s f, or f_squared.
• power_lm() has been added to conduct post-hoc and a priori power analysis, and plan the sample size for one or a set of predictors in linear regression.

Keng 2024.11.17

• Added a NEWS.md file to track changes to the package.
• Dataset depress is added.
• Format of compare_lm()’s output is reorganized.
• Versatile Scale() is added.