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t-Test Free
The t-Test tells you how significant the differences between group means are. It lets you know if those differences in means could have happened by chance. The t-Test is used when data sets follow a normal...
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Regression Free
Regression is the statistical approach to find the relationship between variables. It allows you to estimate the value of a dependent variable (Y) from a given independent variable (X). When to use...
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Kruskal-Wallis Test Free
When to use NOTE: The Kruskal-Wallis test compares the medians of three or more independent groups while a one-way ANOVA compares the means of three or more independent groups. Features Before we can...
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Chi-square Tests Free
Chi-square tests look at the pattern of your data points and tell you if certain combinations of the categories occur more frequently than would be expected by chance. This section explains the Chi-square...
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Bartlett's Test Free
Many statistical tests (like a one-way ANOVA) assume that variances are equal across samples. Bartlett’s test can be used to verify that assumption. When to use Features Many statistical tests (like...
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ANOVA Free
A one-way ANOVA (“analysis of variance”) compares the means of three or more independent groups to determine whether there is a statistically significant difference between the corresponding population...
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Statistics - the p-value Free
A p-value indicates how believable the null hypothesis is, given the sample data. Specifically, assuming the null hypothesis is true, the p-value tells us the probability of obtaining the results we observed...
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Developing Statistical Hypotheses Free
Developing hypotheses We always have a null hypothesis (H0) and an alternative hypothesis H1). We do statistical tests to decide which of the two hypotheses may be correct. We always start by assuming...
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Rose Diagrams Free
Rose diagrams are useful in fieldwork to analyse data containing magnitude and direction values. When to use Features Rose diagrams are useful in fieldwork to analyse data containing magnitude and direction...
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Pie Charts
A pie chart shows how a total amount is divided between different categorical variables. When to use NOTE: If you want to compare two or more sets of data it is better to use a 100% Stacked Bar Chart...