Cronbach Alpha Calculator

Calculate Cronbach Alpha





Formula

The formula to calculate Cronbach Alpha is:

\[ \alpha = \frac{N \times C}{v + (N - 1) \times C} \]

Where:

What is Cronbach Alpha?

Cronbach’s alpha, also known as coefficient alpha, is a measure of the internal consistency of a test. In other words, it assesses how reliable the test is at predicting an outcome. A higher Cronbach’s alpha indicates greater reliability.

Example Calculation 1

Let's assume the following values:

Using the formula:

\[ \alpha = \frac{10 \times 0.5}{0.3 + (10 - 1) \times 0.5} = \frac{5}{0.3 + 4.5} = \frac{5}{4.8} \approx 1.04 \]

The Cronbach Alpha is approximately 1.04.

Example Calculation 2

Let's assume the following values:

Using the formula:

\[ \alpha = \frac{5 \times 0.4}{0.2 + (5 - 1) \times 0.4} = \frac{2}{0.2 + 1.6} = \frac{2}{1.8} \approx 1.11 \]

The Cronbach Alpha is approximately 1.11.