Enter 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 MoreUniform Distribution CDF Calculator Uniform Distribution CDF Calculator Calculate the CDF for a Uniform Distribution over the interval \([a,b]\): $$ F(x)= \begin{cases} 0, & x < a,\\[1ex] \frac{x-a}{b-a}, & a \le x \le b,\\[1ex] 1, & x > b. \end{cases} $$ * Enter the lower bound \(a\), upper bound \(b\) (with \(b > a\)), and […]
Read MoreEnter the chi-square statistic (x) and degrees of freedom (df) to find the p-value (upper-tail probability). This tool uses approximations. For critical analyses, please use professional statistical software. Chi-Square p-Value Calculator | Compute Upper-Tail Probability Chi-Square p-Value Calculator Input Data Chi-Square Value (x): Degrees of Freedom (df): Calculate p-Value Results p-value: 0.0000 *This calculation is […]
Read MoreCohen’s d Calculator for Student t-Test Cohen’s d Calculator for Student t-Test Calculate the standardized difference between two group means using: $$ s_p = \sqrt{\frac{(n_1-1)s_1^2+(n_2-1)s_2^2}{n_1+n_2-2}},\quad d=\frac{M_1-M_2}{s_p}. $$ * Enter the sample sizes, means, and standard deviations for both groups. Group 1 Parameters Sample Size, \( n_1 \): e.g., 30 Mean, \( M_1 \): e.g., 100 […]
Read MoreCohen’s f² Effect Size Calculator for Multiple Regression Cohen’s \( f^2 \) Effect Size Calculator In multiple regression, Cohen’s \( f^2 \) is calculated as: $$ f^2=\frac{R^2}{1-R^2}. $$ * Enter the \( R^2 \) value from your regression model (must be between 0 and 1). Step 1: Enter Regression \( R^2 \) Observed \( R^2 […]
Read MoreR² Calculator from Cohen’s \( f^2 \) Effect Size Given Cohen’s \( f^2 \) defined as $$ f^2=\frac{R^2}{1-R^2}, $$ the population \( R^2 \) is calculated as: $$ R^2=\frac{f^2}{1+f^2}. $$ * Enter Cohen’s \( f^2 \) (must be \( \ge 0 \)). Step 1: Enter Cohen’s \( f^2 \) Cohen’s \( f^2 \): e.g., 0.30 […]
Read MoreError Function (erf) Calculator Compute the error function: $$ \operatorname{erf}(x) \approx \operatorname{sgn}(x)\Bigl[1-\Bigl(a_1t + a_2t^2 + a_3t^3 + a_4t^4 + a_5t^5\Bigr)e^{-x^2}\Bigr], $$ where \( t=\frac{1}{1+0.3275911\,|x|} \). * Enter the value \( x \). Step 1: Enter \( x \) \( x \): e.g., 1 Calculate erf(x) Calculated Error Function \( \operatorname{erf}(x) \): Recalculate Approximation constants: \( […]
Read MoreInverse Error Function (erf⁻¹) Calculator Inverse Error Function (erf⁻¹) Calculator Value of y (-1 < y < 1): Calculate erf⁻¹(y) Reset
Read MoreConditional Probability Calculator Conditional Probability Calculator Select Operation: Calculate P(A|B)Calculate P(A ∩ B) Calculate Reset
Read MoreUnion Probability Calculator Union Probability Calculator Select Calculation Type: Calculate P(A ∪ B) using P(A), P(B), and P(A ∩ B)Calculate P(A ∪ B) for Independent EventsCalculate P(A ∪ B) for Mutually Exclusive Events Calculate P(A ∪ B) Reset
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