/**
 * Pre-constructed tools for descriptive statistics, correlation, quantiles, and numeric summaries.
 *
 * @module @nhtio/adk/batteries/tools/statistics
 *
 * @remarks
 * Pre-constructed bundled tools for the `statistics` category. Import individually, the whole
 * category, or import every tool via `@nhtio/adk/batteries`.
 */
import { Tool, SpooledJsonArtifact } from "../../../common";
/**
 * Compute descriptive statistics for a JSON array of numbers.
 *
 * @remarks
 * Returns count, sum, min/max/range, mean, median, mode, variance, standard deviation,
 * quartiles (Q1/Q2/Q3), IQR, and key percentiles (P10/P90/P95/P99) as a pretty-printed JSON
 * object. Non-numeric and non-finite entries are silently filtered.
 */
export declare const statsDescribeTool: Tool<SpooledJsonArtifact<unknown>>;
/**
 * Compute the Pearson correlation coefficient between two numeric arrays.
 *
 * @remarks
 * Returns `r`, `r²` (as a percentage of explained variance), and a plain-English interpretation
 * of strength and direction. Arrays must be the same length and contain at least two points.
 */
export declare const statsCorrelateTool: Tool<import("../../../common").SpooledArtifact>;
/**
 * Transform a numeric array — normalise, smooth, rank, or detect outliers.
 *
 * @remarks
 * Supported operations: `normalize_min_max`, `normalize_z_score`, `normalize_percent_of_sum`,
 * `running_total`, `rolling_avg`, `pct_change`, `rank`, `outliers_iqr`, `outliers_zscore`. Most
 * operations return a JSON array of transformed values; outlier operations return a
 * human-readable report.
 */
export declare const statsTransformTool: Tool<import("../../../common").SpooledArtifact>;
/**
 * Bin a numeric array into equal-width histogram buckets.
 *
 * @remarks
 * Output is a text histogram showing each bin's range, count, percentage of total, and a bar
 * chart. The last bin is inclusive on both ends; preceding bins are half-open. `bins` is clamped
 * to `[2, 100]`.
 */
export declare const statsHistogramTool: Tool<import("../../../common").SpooledArtifact>;