This article explains how 58 Tongcheng’s design team upgraded the QMD evaluation framework to QMD 3.0, using reliability testing, ICC analysis, and systematic process controls to make subjective UX scores more trustworthy and actionable across product lines.
This guide explains PCA fundamentals, walks through suitability checks like KMO and Bartlett’s test, details step‑by‑step SPSS operations, and demonstrates how to interpret eigenvalues, scree plots, and rotated component matrices to extract meaningful factors from questionnaire data.
This tutorial explains how to use SPSS's LONG TO WIDE function to reshape long‑format data into wide format, detailing each menu navigation step, variable selection, and index setup with illustrative screenshots.
This article explains how to use SPSS to conduct a one‑way ANOVA, walks through a clinical case with ALT measurements, shows the required SPSS settings, interprets descriptive and post‑hoc results, and provides guidance for writing the final statistical conclusion.
This guide explains how to conduct a 2 × 2 chi‑square test in SPSS, covering data entry, weighting, step‑by‑step menu selections, cell options, result interpretation, and decision rules for choosing the appropriate test based on sample size and expected frequencies.
This article guides readers through a paired‑samples t‑test in SPSS to evaluate whether Keratin‑10 treatment significantly changes hemoglobin levels in ten silicosis patients, covering data preparation, test execution, result interpretation, and concluding that the drug shows no statistical effect.
This article presents a practical example using SPSS to perform an independent‑samples t‑test on iron concentrations in mouse livers from two diet groups, explains the assumptions, walks through data entry, test configuration, result interpretation, and concludes that the dietary effect is not statistically significant.
This guide walks through a health‑survey example, showing how to check SPSS assumptions for outliers and normality, perform a one‑sample t‑test on BMI data, interpret the output, and draw a statistically significant conclusion about the sample mean versus the population mean.
This article explains why simple single‑feature analysis can miss important user groups, introduces decision trees—especially the CHAID algorithm—as a way to uncover multi‑attribute segments, and provides step‑by‑step instructions for building descriptive and predictive trees in SPSS, including how to interpret tree visuals and benefit tables.
This article explains TURF (Totally Unduplicated Reach and Frequency) analysis, illustrating how it helps marketers choose optimal media channel or product combinations to achieve the highest unduplicated user coverage while using the least resources.
This article analyzes a ride‑hailing business case, using SPSS to fit discount‑order and discount‑revenue curves, derives optimal discount points (84% for fastest order growth and 86% for maximum revenue), and discusses how these insights guide subsidy and marketing strategies.
This article presents a statistical analysis of China's real‑estate market, detailing model assumptions, data collection, correlation and regression results using SPSS and EViews, and forecasting the total housing floor‑area demand for 2015.
