This calculator will tell you the minimum sample size required for a hierarchical multiple regression analysis; i.e., the minimum sample size required for a significance test of the addition of a set of independent variables B to the model, over and above another set of independent variables A. The value returned by the calculator is […]
Read MoreFisher’s Exact Test Calculator (2×3) Enter the cell counts for your 2×3 contingency table: \( \begin{array}{ccc} a & b & c \\ d & e & f \end{array} \) * The p‑value is computed by summing the probabilities of all tables (with fixed margins) whose probability is ≤ that of the observed table. Step 1: […]
Read MoreFisher’s Exact Test Calculator (2×2) Fisher’s Exact Test Calculator (2×2) Enter the counts for the 2×2 table: \( \begin{array}{cc} a & b \\ c & d \end{array} \) * The p‑value is computed by summing the probabilities of all tables (with fixed margins) whose probability is ≤ that of the observed table. Step 1: Enter […]
Read MoreUse this calculator to determine the confidence interval for the regression intercept in your analysis. Input your estimated intercept, standard error, sample size, and the number of predictors to obtain the confidence interval. For critical analyses, verify results with professional statistical software or consult a statistician. Regression Intercept Confidence Interval Calculator Calculate the confidence interval […]
Read MoreHierarchical Regression F‑Value Calculator Hierarchical Regression F‑Value Calculator Calculate the incremental F‑statistic for hierarchical regression using: $$ F=\frac{(R^2_{\text{full}}-R^2_{\text{base}})/(k_{\text{full}}-k_{\text{base}})}{(1-R^2_{\text{full}})/(n-k_{\text{full}}-1)}. $$ * Enter the sample size \( n \), baseline model \( R^2 \) and number of predictors \( k_{\text{base}} \), and full model \( R^2 \) and number of predictors \( k_{\text{full}} \). Note: \( n […]
Read MoreComplementary Error Function (erfc) Calculator Complementary Error Function (erfc) Calculator The complementary error function is defined as $$ \operatorname{erfc}(x)=1-\operatorname{erf}(x). $$ * Enter the value of \( x \). Step 1: Enter \( x \) \( x \): e.g., 1 Calculate \( \operatorname{erfc}(x) \) Calculated Complementary Error Function \( \operatorname{erfc}(x) \): Recalculate Formula: \( \operatorname{erfc}(x)=1-\operatorname{erf}(x) \)
Read MoreIndirect Effect Calculator for Mediation Models Indirect Effect Calculator for Mediation Models Calculate the indirect effect using the product-of-coefficients method: $$ \text{Indirect Effect} = a \times b $$ * Enter the path coefficient \( a \) (from the independent variable to the mediator) and \( b \) (from the mediator to the dependent variable). Step […]
Read MoreEnter the Pearson correlation coefficient (r) and sample size (n) to compute the t-statistic and two-tailed p-value, helping you assess the significance of the observed correlation. Note: This is an approximation; for critical analyses, use professional statistical software. Correlation p‑Value Calculator Correlation p‑Value Calculator Calculate the two‑tailed p‑value for a correlation coefficient using: $$ t=\frac{r\sqrt{n-2}}{\sqrt{1-r^2}}, […]
Read MoreGamma Function Calculator Enter a number to calculate its Gamma function value. (The Gamma function generalizes the factorial.) Step 1: Enter Value Input Value (x): Calculate Gamma Gamma Function Result Γ(x): Recalculate
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