dataSDA 0.1.8

Vignette

Comprehensive rewrite covering all 51 exported functions (was 18), organized into 14 sections: format detection/conversion, core stats, geometry, position, robust, shape, similarity, uncertainty, distance, histogram stats, and utilities.
Fixed garbled characters, stale dataset references, and broken histogram example code.

MM_to_RSDA() — convert MM format (_min/_max columns) to RSDA format (symbolic_tbl with complex-encoded intervals).
iGAP_to_RSDA() — convert iGAP format to RSDA format via iGAP_to_MM → MM_to_RSDA.

int_list_conversions() now returns 8 conversions (was 6), including MM_to_RSDA and iGAP_to_RSDA.
int_convert_format() now supports to = "RSDA" for MM and iGAP sources with auto-detection.

Comprehensive rewrite covering all 51 exported functions (was 18), organized into 14 sections: format detection/conversion, core stats, geometry, position, robust, shape, similarity, uncertainty, distance, histogram stats, and utilities.
Fixed garbled characters, stale dataset references, and broken histogram example code.

49 new tests for the new conversion functions and updated conversion registry (517 total, all passing).

Adopted snake_case naming with type suffixes (.int, .hist, .mix, .distr, .iGAP) for all datasets. Renamed 10 existing datasets:

acid_rain.int, bats.int, credit_card.int, employment.int, oils.int, teams.int, tennis.int, temperature_city.int, trivial_intervals.int, world_cup.int (interval-valued)
bird_species.mix, bird_species_extended.mix, town_services.mix (mixed symbolic)
lung_cancer.hist (histogram-valued)
energy_consumption.distr (distribution-valued)
bank_rates, mushroom_fuzzy (other)

Format detection and conversion (interval_format_conversions.R):
- int_detect_format() — automatically detect interval data format (RSDA, MM, iGAP, SODAS).
- int_list_conversions() — list available format conversion functions, with optional filtering by source/target format.
- int_convert_format() — unified interface for all interval format conversions with auto-detection.

Updated vignette, examples, and tests to use new dataset names.
70 new tests for format detection and conversion helpers (468 total, all passing).
R CMD check: 0 errors, 0 warnings, 0 notes.

Interval distances (interval_dist.R): int_dist(), int_dist_matrix(), int_pairwise_dist(), int_dist_all() — 14 distance measures (GD, IY, L1, L2, CB, HD, EHD, nEHD, snEHD, TD, WD, minkowski, ichino, de_carvalho) with method aliases (euclidean, hausdorff, manhattan, city_block, wasserstein).
Interval geometry (interval_geometry.R): int_width(), int_radius(), int_center(), int_overlap(), int_containment(), int_midrange().
Position and scale (interval_position.R): int_median(), int_quantile(), int_range(), int_iqr(), int_mad(), int_mode() — all support 8 methods (CM, VM, QM, SE, FV, EJD, GQ, SPT).
Robust statistics (interval_robust.R): int_trimmed_mean(), int_winsorized_mean(), int_trimmed_var(), int_winsorized_var().
Distribution shape (interval_shape.R): int_skewness(), int_kurtosis(), int_symmetry(), int_tailedness().
Similarity measures (interval_similarity.R): int_jaccard(), int_dice(), int_cosine(), int_overlap_coefficient(), int_tanimoto(), int_similarity_matrix().
Uncertainty and variability (interval_uncertainty.R): int_entropy(), int_cv(), int_dispersion(), int_imprecision(), int_granularity(), int_uniformity(), int_information_content().

Merged 6 interval conversion files into a single R/interval_format_conversions.R, organized by target format.
Extracted shared internal helpers, reducing ~454 lines of duplicated code.
R/interval_utils.R: consolidated 7 internal interval helpers, format-preparation functions (RSDA_format, set_variable_format, clean_colnames), and their internal helpers.
R/histogram_utils.R: 8 internal helpers for histogram statistics.
Renamed utils_validation.R to validation.R.
R CMD check: 0 errors, 0 warnings, 0 notes. All 399 tests pass.

Input validation for all 18 exported functions: every function now validates its inputs at entry, producing clear error messages instead of cryptic R internals errors.
New R/utils_validation.R: 11 internal validation helpers centralizing all checks.
RSDA_format fix: replaced 4 return("Error") with proper stop() calls.
62 new regression tests for input validation (399 total, all passing).
R CMD check: 0 errors, 0 warnings.
Added NEWS.md with changelog for all versions.