fix: always resolve the alternative string

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---

Author: kgryte

lib/node_modules/@stdlib/stats/strided/dztest/lib/dztest.js

@@ -30,7 +30,7 @@ var ndarray = require( './ndarray.js' );
 * Computes a one-sample Z-test for a double-precision floating-point strided array.
 *
 * @param {PositiveInteger} N - number of indexed elements
-* @param {string} alternative - alternative hypothesis
+* @param {(integer|string)} alternative - alternative hypothesis
 * @param {number} alpha - significance level
 * @param {number} mu - mean under the null hypothesis
 * @param {PositiveNumber} sigma - known standard deviation

lib/node_modules/@stdlib/stats/strided/dztest/lib/dztest.native.js

@@ -30,7 +30,7 @@ var addon = require( './../src/addon.node' );
 * Computes a one-sample Z-test for a double-precision floating-point strided array.
 *
 * @param {PositiveInteger} N - number of indexed elements
-* @param {string} alternative - alternative hypothesis
+* @param {(integer|string)} alternative - alternative hypothesis
 * @param {number} alpha - significance level
 * @param {number} mu - mean under the null hypothesis
 * @param {PositiveNumber} sigma - known standard deviation

lib/node_modules/@stdlib/stats/strided/dztest/lib/ndarray.js

@@ -20,6 +20,7 @@
 
 // MODULES //
 
+var resolveStr = require( '@stdlib/stats/base/ztest/alternative-resolve-str' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var quantile = require( '@stdlib/stats/base/dists/normal/quantile' ).factory;
 var cdf = require( '@stdlib/stats/base/dists/normal/cdf' ).factory;
@@ -46,7 +47,7 @@ var WORKSPACE = new Float64Array( 2 );
 * Computes a one-sample Z-test for a double-precision floating-point strided array using alternative indexing semantics.
 *
 * @param {PositiveInteger} N - number of indexed elements
-* @param {string} alternative - alternative hypothesis
+* @param {(integer|string)} alternative - alternative hypothesis
 * @param {number} alpha - significance level
 * @param {number} mu - mean under the null hypothesis
 * @param {PositiveNumber} sigma - known standard deviation
@@ -74,8 +75,10 @@ function dztest( N, alternative, alpha, mu, sigma, x, strideX, offsetX, out ) {
 	var stderr;
 	var xmean;
 	var stat;
+	var alt;
 	var q;
 
+	alt = resolveStr( alternative );
 	if (
 		N <= 0 ||
 		isnan( alpha ) ||
@@ -88,7 +91,7 @@ function dztest( N, alternative, alpha, mu, sigma, x, strideX, offsetX, out ) {
 		WORKSPACE[ 0 ] = NaN;
 		WORKSPACE[ 1 ] = NaN;
 		out.rejected = false;
-		out.alternative = alternative;
+		out.alternative = alt;
 		out.alpha = NaN;
 		out.pValue = NaN;
 		out.statistic = NaN;
@@ -107,12 +110,12 @@ function dztest( N, alternative, alpha, mu, sigma, x, strideX, offsetX, out ) {
 	stat = ( xmean - mu ) / stderr;
 
 	// Compute the p-value and confidence interval...
-	if ( alternative === 'less' ) {
+	if ( alt === 'less' ) {
 		pValue = normalCDF( stat );
 		q = normalQuantile( 1.0-alpha );
 		WORKSPACE[ 0 ] = NINF;
 		WORKSPACE[ 1 ] = mu + ( (stat+q)*stderr );
-	} else if ( alternative === 'greater' ) {
+	} else if ( alt === 'greater' ) {
 		pValue = 1.0 - normalCDF( stat );
 		q = normalQuantile( 1.0-alpha );
 		WORKSPACE[ 0 ] = mu + ( (stat-q)*stderr );
@@ -125,7 +128,7 @@ function dztest( N, alternative, alpha, mu, sigma, x, strideX, offsetX, out ) {
 	}
 	// Return test results:
 	out.rejected = ( pValue <= alpha );
-	out.alternative = alternative;
+	out.alternative = alt;
 	out.alpha = alpha;
 	out.pValue = pValue;
 	out.statistic = stat;

lib/node_modules/@stdlib/stats/strided/dztest/lib/ndarray.native.js

@@ -30,7 +30,7 @@ var addon = require( './../src/addon.node' );
 * Computes a one-sample Z-test for a double-precision floating-point strided array using alternative indexing semantics.
 *
 * @param {PositiveInteger} N - number of indexed elements
-* @param {string} alternative - alternative hypothesis
+* @param {(integer|string)} alternative - alternative hypothesis
 * @param {number} alpha - significance level
 * @param {number} mu - mean under the null hypothesis
 * @param {PositiveNumber} sigma - known standard deviation