Contents
What type of data can chi squared be used to test?
The Chi-square test analyzes categorical data. It means that the data has been counted and divided into categories. It will not work with parametric or continuous data. It tests how well the observed distribution of data fits with the distribution that is expected if the variables are independent.
How do you use chi-square to determine significance?
You could take your calculated chi-square value and compare it to a critical value from a chi-square table. If the chi-square value is more than the critical value, then there is a significant difference. You could also use a p-value. First state the null hypothesis and the alternate hypothesis.
What is the difference between Anova and Chi-square test?
The chi-square is used to investigate whether the distribution of classes and is compatible with a distribution model (often equal distribution, but not always), while ANOVA is used to investigate whether differences in means between samples are significant or not.
Which is the best test for Benford’s law?
Based on that plot, the digit frequencies look like they follow Benford’s law. We can confirm that with a Chi-square goodness-of-fit test using the chisq-test function. Start with Ahmadinejad,
What is the X square value of Benford’s law?
The X-square test value is 5.439 with a p-value of 0.71. Based on these values we cannot reject the null hypothesis that the observed distribution of first-digits is the same as the expected distribution, which follows Benford’s law. Next test Mousavi’s vote counts, The X-square test value for Mousavi is 5.775 with a p-value of 0.672.
Which is the correct result for the chi square test?
The first two values are less than the critical value, whereas the last two are greater, thus producing a result which is consistent with the chi-square test and visual comparison of the FSD distributions.
How can I check Benford’s law for Ahmadinejad?
It’s always a good idea to look at the data, so plot the predicted first-digit frequencies and the frequencies for Ahmadinejad and Mousavi. Based on that plot, the digit frequencies look like they follow Benford’s law. We can confirm that with a Chi-square goodness-of-fit test using the chisq-test function.