Exercise

Exploring item correlations

We want to find groups of survey items that correlate highly with each other, but not so highly with items outside their group. Let's take a look at the correlation between the nine survey items in our brand_qual survey. It's common to suffix a survey name with its number of items, so the data frame brand_qual_9 has been loaded for analysis. We will analyze item correlations using a combination of psych and corrplot, which have each been loaded.

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Print the correlations between all items along with their significance levels.