AMCP 2.0.0

A major release that tailors the package to the 4th edition of Maxwell, Delaney, and Kelley, Designing Experiments and Analyzing Data: A Model Comparison Perspective (2027, Routledge).

Data

• Added three further Chapter 12 exercise data sets that the book directs readers to the companion website for, each under a long name and short alias: chapter_12_exercise_22 (C12E22) and chapter_12_exercise_23 (C12E23), the Hu, Antony, Creery, Vargas, Bodenhausen, and Paller (2015) sleep-and-implicit-bias study (Exercise 22 is the 2 by 2 cued/uncued by prenap/postnap design for 40 participants; Exercise 23 adds the one-week delayed measurement for the 38 participants who returned); and chapter_12_exercise_25 (C12E25), the Kroes, Tendolkar, van Wingen, van Waarde, Strange, and Fernandez (2014) electroconvulsive-therapy memory study (three groups, reactivated and non-reactivated story scores; its variables are cond, reactivated, and nonreactivated, matching the names the exercise gives). The same Kroes study supplies the one-way data of chapter_4_exercise_21. Each reproduces the results reported for its exercise.
• Added the three Chapter 12 exercise data sets that the book directs readers to the companion website for, each under a long name and short alias: chapter_12_exercise_24 (C12E24), the Carnes, Lickel, and Janoff-Bulman
  2015. study in which 118 participants rated six moral principles in each of four social contexts; chapter_12_exercise_26 (C12E26), the Gibson, Radvansky, Johnson, and McNerney (2012) grapheme-color synesthesia study (48 nonsynesthetes and 10 synesthetes, with input-output correspondence and recall accuracy for high- and low-frequency words); and chapter_12_exercise_27 (C12E27), the Bray and Maxwell (1995) reports of negative life events from the mother, father, and child of 95 nuclear families and 98 stepfamilies. Each reproduces the results reported for its exercise.
• New data set chapter_14_table_13 (alias C14T13): the longitudinal randomized design introduced in Chapter 14 (100 participants, 44 treatment and 56 control, measured at baseline and two post-intervention occasions). These data underlie Tables 14.13 and 14.14 and are analyzed again with mixed-effects models in Chapter 15 (Tables 15.15 and 15.16). Stored in the long format expected by the Chapter 15 code.
• The data sets now correspond to the 4th edition of the book: the chapter tables, the end-of-chapter exercises, and the tutorials. Each data set continues to ship under both its long name (e.g., chapter_1_table_1) and its short alias (e.g., C1T1), and the numeric coding of variables is preserved so the book’s model-comparison and contrast examples reproduce exactly.
• Several data sets were renamed so their numbers match the 4th edition’s table numbering, which shifted relative to earlier printings: chapter_7_table_15 becomes chapter_7_table_16, chapter_7_table_23 becomes chapter_7_table_24, chapter_9_table_11 becomes chapter_9_table_12, chapter_12_table_21 becomes chapter_12_table_29, chapter_13_table_5 becomes chapter_13_table_6, chapter_13_table_12 becomes chapter_13_table_10, and the split-plot reaction-time tables chapter_14_table_8 and chapter_14_table_10 become chapter_14_table_7 and chapter_14_table_9. Only the names changed; the data values are identical. The short aliases were renamed to match (for example, C7T15 becomes C7T16).
• Added the transformed-score data sets the 4th edition reports alongside the split-plot example: chapter_14_table_8 (the M and D scores for the data in Table 14.7) and chapter_14_table_10 (the M, D1, and D2 scores for the data in Table 14.9), each also under its short alias (C14T8, C14T10).
• Removed chapter_13_table_14 (and its alias C13T14). Its slope and linear-trend scores correspond to a 3rd-edition table that is not part of the 4th edition; the linear-trend values it tabulated remain available as the Linear column of chapter_13_table_10.
• Removed chapter_4_table_7 (and its alias C4T7). It held data for a 3rd-edition demonstration that the sums of squares of orthogonal contrasts are additive while those of nonorthogonal contrasts are not; in the 4th edition that demonstration moved to the online supplement (designingexperiments.com/supplements), so the data set no longer corresponds to a printed table. The 4th edition’s printed Table 4.7 is the Exercise 11 data, which is already shipped as chapter_4_exercise_11.
• Corrected the content of chapter_7_table_9 (and its alias C7T9). It had held a 36-row combined data set (the Table 7.5 blood-pressure data with a sixth observation appended to each cell). The 4th edition’s Table 7.9 is instead the six additional observations themselves (one per cell), so the data set now holds those six rows. Stacking them onto chapter_7_table_5 with rbind() recreates the six-per-cell data whose cell and marginal means are reported in Table 7.10.
• Added five data sets that appear in the 4th edition but had not shipped previously, each under a long name and short alias: chapter_4_exercise_18 (C4E18, four-therapy agoraphobia fear scores), chapter_4_exercise_21 (C4E21, the Kroes et al. (2014) three-group ECT memory data), chapter_6_exercise_11 (C6E11, drug-dosage maze errors), chapter_7_exercise_21 (C7E21, the oxytocin-by-gender trust study), and chapter_13_table_5 (C13T5). chapter_13_table_5 is Table 13.5 of the 4th edition (“Two Sets of Hypothetical Data to Illustrate How a Determinant Reflects Generalized Variance”); it holds only the two D (difference) variables for each of the two data sets, because the book gives only those derived scores and not the raw data they were computed from. (In the 4th edition the 3rd-edition Table 13.5 was renumbered to Table 13.6, shipped as chapter_13_table_6.)
• Corrected the salaries in chapter_7_exercise_18 (and its alias C7E18). Every value had been 40 (thousand) too low relative to the 4th edition’s Exercise 18 table; the salaries now match the book exactly (Assistant-rank females 73, 76, 75, 78, 82, 77; and so on). The level and gender codes are unchanged.
• Corrected the column names of chapter_14_exercise_10 (and its alias C14E10). The data are the Kosslyn grids-versus-brackets by left-versus-right hemisphere reaction times (the same data as chapter_12_exercise_9), but the columns had been mislabeled Angle0, Angle4, Angle8, Group (copied from the split-plot angle example); they are now GridLeft, GridRight, BraceLeft, BraceRight. The values are unchanged.
• Renamed the second cognitive-measure column of chapter_15_exercise_19 (and its alias C15E19) from Cognitive73 to Cognitive72. The three columns record ability at ages 70, 72, and 74 (as the companion chapter_15_exercise_19_univariate records with Age = 70/72/74), so the middle column’s name was corrected to match; the data values are unchanged.
• Corrected tutorial_1_table_1 (and its alias T1T1). A header-less import had turned the first score (22) into the column name (X22) and dropped that observation, leaving 102 rows. The data set now holds the full 103 Beck Depression Inventory scores in a column named BDI, reproducing the statistics reviewed in Tutorial 1 (sum 1,622, mean 15.748, median 13, mode 9, range 0 to 43, skewness .629, kurtosis -.243).
• Reordered the columns of chapter_16_table_1 (and its alias C16T1) to Trainee, Gender, Severity, and reordered chapter_16_exercise_5 (C16E5), which analyzes the same Table 16.1 data, to match. The data values are unchanged.
• For the data exactly as distributed with the 3rd edition (2018), install the archived CRAN release 1.0.2: remotes::install_version("AMCP", "1.0.2").

Documentation

• Corrected the Variables lists in several help pages that had been copied from the wrong data set, so the documented variables now match the shipped columns: chapter_3_table_3, chapter_7_table_11, chapter_10_table_9, chapter_11_table_20, and chapter_13_table_10.
• Fixed assorted spelling and typographical errors in the help text and added an inst/WORDLIST for the package’s domain vocabulary.
• The chapter_13_table_10 examples now show how its linear and quadratic D variables are formed from the raw three-level data of chapter_13_table_2 using the orthogonal-polynomial coefficients of Appendix Table A.10.
• The chapter_7_table_9 examples now show how its six additional observations combine with chapter_7_table_5 to reproduce the cell and marginal means of Table 7.10.
• Gave the Feedback and Drug variables of chapter_7_table_5 and chapter_7_table_9 informative level labels (Feedback: 1 = biofeedback present, 2 = absent; Drug: 1 = X, 2 = Y, 3 = Z), matching the labels used in the book’s Table 7.10.
• Every table that was renumbered, corrected, removed, or added for the 4th edition now carries a Note on its help page identifying the change (and, for a renumbered or reused name, the corresponding 3rd-edition name), so readers coming from the 3rd edition are not misled by a shifted or reused table number.
• Made the help text self-contained by removing references to specific statistical software (for example, notes that an analysis had been carried out in a particular package, or that a procedure was unavailable in one); the surviving prose describes the analyses in tool-neutral, model-comparison terms so the documentation stands on its own.

Infrastructure

• Added a testthat (edition 3) test suite that loads every data set, checks that the long and short aliases agree, and reproduces several numeric results reported in the book (the Chapter 3 one-sample t test, the Chapter 13 trend-contrast omnibus F, and the Chapter 9 Pygmalion heterogeneity-of-regression slopes).
• Added a vignette, factors-and-coding, with recipes for attaching factor labels to the numerically coded variables without changing the canonical data, including a worked example confirming that relabeling reproduces the book’s results.
• Added a package CITATION file.
• On attach, the package prints a short startup message noting that version 2.x maps to the 4th edition (2027), pointing to news(package = "AMCP") for the list of changed tables, and directing 3rd-edition (2018) users to the archived remotes::install_version("AMCP", "1.0.2").
• Added the maintainer’s website (https://kenkelley.org/) and the book companion site to the package URL field.