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If this is the case, this would be similar to plotting the residuals (or another diagnostic quantity) against time. The index plot is a helpful diagnostic test for normal linear and particularly generalized linear models. Both outliers and influential points can be detected by the index plot. It is particularly useful when the data is in time order so that pattern in the residuals, etc. over time can be detected. If a residual index plot is showing a trend in time, then they are not independent (violation of a major assumption of linear regression).
The difference is illustrated below. The other key difference is that INDEX MATCH formulas work as a right to left lookup, whereas VLOOKUP only works left to right. As you can see in the example below, I can use INDEX MATCH to lookup a value that is to the right of my return value using INDEX MATCH.When we combine both the INDEX formula and the MATCH formula, the number that the MATCH formula returns becomes the row number for your INDEX formula. =INDEX (array, MATCH formula). Below is an example of using the INDEX MATCH to return âProduct Typeâ for our lookup value.As you can see, it returns the same value we got from VLOOKUP.INDEX (array, row number). Below is an example of using INDEX to return the value âShirts,â assuming that you already know that the value is three cells down on your defined array. (you also have the option to specify column number, but that isnât relevant in a basic INDEX MATCH formula).