/**
 * Draw a simple histogram with a single line of characters.
 * @param data - the data to draw
 * @param min - optional minimum value, defaults to the minimum value in the data
 * @param max - optional maximum value, defaults to the maximum value in the data
 * @param barChars - the characters to use for the bar, defaults to `['▁', '▂', '▃', '▄', '▅', '▆', '▇', '█']`
 * @returns a string of the histogram
 */
export declare function simpleHistogram(data: readonly number[], min?: number, max?: number, barChars?: string[]): string;
/**
 * Generate a bar line for a value
 * @param value - between 0 and 1 inclusive.
 * @param width - the width of the bar in characters
 * @param padding - optional padding character, defaults to space.
 * @param barChars - the characters to use for the bar, defaults to `['▏', '▎', '▍', '▌', '▋', '▊', '▉', '█']`
 * @returns a string of the bar
 */
export declare function barHorizontal(value: number, width: number, padding?: string, barChars?: string[]): string;
/**
 *
 * @param point - the point to plot
 * @param sd - the standard deviation
 * @param mean - the mean
 * @param width - the width of the plot in characters
 * @param range - the +/- range to plot, defaults to 2.5 SD.
 *   A value of 1 would mean to show only the range of a single standard deviation.
 * @returns a string representing the plot
 */
export declare function plotPointRelativeToStandardDeviation(point: number, sd: number, mean: number, width: number, range?: number): string;