E-CodeChi-square test of independence — a TI-84 Plus CE program
CHIIND is a TI-BASIC program for the TI-84 Plus CE. Type a contingency table row by row: the chi-square statistic from the expected counts, degrees of freedom, p-value and Cramér's V, with a warning when any expected count is under 5.
What it asks for and what it shows
It asks for 4 values at its prompts. In the example below it shows CHI², DF, V, MIN E, N, P.
Example run
One of its oracle test cases: “2x2: smoking vs condition”. The inputs are typed in order, and the results are the values the case expects on the screen.
| Step | Value |
|---|---|
| You enter | |
| Input 1 | 2 |
| Input 2 | 2 |
| Input 3 | {30,70} |
| Input 4 | {45,55} |
| The screen shows | |
CHI²= | 4.8 |
DF= | 1 |
V= | 0.1549193338 |
MIN E= | 37.5 |
N= | 200 |
P= | 0.02845973692 |
How it's checked
4 test cases, each checked against an independent method. Replayed key by key on a virtual TI-84 Plus CE, they make 27 checks.
How E-Code checks every program
Run it or put it on your calculator
- Open the library in the TI-84 Plus CE calculator and pick “Chi-square test of independence” (CHIIND).
- Put it on your own calculator with a computer and a USB cable, or type it in by hand.
Related programs
- Hypothesis tests: z, t, two-sample t, chi-square
- Regression: linear, quadratic, exponential with r²
- Confidence intervals: z, t, proportion, two-sample
- Binomial, Poisson and normal probabilities
- One-way ANOVA
All TI-84 Plus CE statistics programs · All TI-84 Plus CE programs