Statistics Tools
Free calculators and tools to help you with your thesis or dissertation. No signup required for basic usage.
Chapter 4 Interpreter
Upload your SPSS output and get your results chapter written in APA style, the paragraphs, the tables and the notes, in English, Thai, Romanian or Spanish. Every number is taken from your file, never generated.
- Reliability, descriptive statistics, assumption tests, hypothesis tests
- One upload for a full Chapter 4, or one section at a time
- Downloadable PDF and copy-ready text
Calculators
Cronbach's Alpha Calculator
Calculate Cronbach's alpha instantly. Paste your data, get reliability coefficient, item-total correlations, alpha-if-deleted analysis, and APA-ready citation.
Sample Size Calculator
Calculate your required sample size using three methods: Yamane (1967), Cochran (1977), and Krejcie & Morgan (1970). Compare results side-by-side with APA citation.
Sobel Test Calculator
Test whether the indirect effect in mediation analysis is statistically significant. Compare Sobel, Aroian, and Goodman tests with APA-ready citation.
IOC Calculator
Calculate the Index of Objective Congruence (IOC) for content validity. Evaluate questionnaire items with expert ratings (+1/0/-1) and get APA-ready citation.
Effect Size Calculator
Calculate Cohen's d, eta-squared, partial eta-squared, R-squared, odds ratio, and Cramér's V. Get magnitude interpretation with APA-ready citation.
McDonald's Omega Calculator
The modern alternative to Cronbach's alpha. Paste your item scores and get ω, factor loadings, variance explained, and an APA-ready citation.
t-test Calculator
Independent, paired and one-sample t-tests from raw data or n, M, SD. Get t, df, p, 95% CI, Cohen's d, Levene's test and the APA 7 results sentence.
Pearson Correlation Calculator
Paste two columns and get Pearson's r, p-value, 95% CI, r², Spearman's rho, a scatter plot and the APA 7 results sentence.
Chi-Square Calculator
Test of independence on a contingency table or goodness of fit. Get χ², df, p, expected counts, Cramér's V, Fisher's exact test and the APA 7 results sentence.
One-Way ANOVA Calculator
Compare three or more group means. ANOVA table, Levene's test, Welch's ANOVA, η² and ω², Tukey HSD or Games–Howell post hoc, and the APA 7 results sentence.
Descriptive Statistics & Normality Calculator
Paste your variables and get the APA descriptives table, skewness and kurtosis with z-values, Shapiro-Wilk and K-S (Lilliefors) tests, histograms and the APA 7 sentences.
Planners
Methodology Planner
Coming SoonAnswer a few questions about your research and get recommended statistical tests, sample size guidance, and a methodology roadmap.