VLOOKUP Inconsistency: Confusion with True Range Lookup
When working with Excel spreadsheets, you may encounter a situation where you want to make a commission within a certain percentage range. However, the results given do not match the expected percentage value, but rather a grade. This can be confusing, especially when trying to use the VLOOKUP function for a true range lookup.
Understanding VLOOKUP
The VLOOKUP function in Excel is used to look up a value in a table and return a corresponding value from another column in the same row. It has the following syntax:
VLOOKUP(lookup_value, table_array, col_index_num, [range_lookup])The range_lookup argument can be either TRUE or FALSE. When set to TRUE, VLOOKUP will perform an approximate match, and when set to FALSE, it will perform an exact match. However, there is a common misconception that TRUE means a range lookup, which can lead to inconsistencies in the results.
The Problem with TRUE Range Lookup
When using TRUE as the range_lookup argument, VLOOKUP will perform an approximate match, which can lead to unexpected results. For example, if you want to calculate a commission based on a sales figure, and you use the following formula:
=VLOOKUP(A1, Table1, 2, TRUE)Where A1 contains the sales figure and Table1 contains the commission rates, you may not get the expected result. This is because VLOOKUP will find the closest match, rather than the exact match. In some cases, this may result in a commission rate that is higher or lower than expected.
Using a True Range Lookup with INDEX and MATCH
To perform a true range lookup, you can use a combination of the INDEX and MATCH functions instead of VLOOKUP. The INDEX function returns the value of a cell in a given range, while the MATCH function returns the position of a value within a given range. Here is an example formula:
=INDEX(Table1[Commission], MATCH(A1, Table1[Sales], 1))Where Table1[Commission] is the column containing the commission rates, Table1[Sales] is the column containing the sales figures, and A1 contains the sales figure to be looked up. The MATCH function uses the 1 argument to perform a true range lookup, finding the largest value that is less than or equal to the lookup value.
When using Excel to calculate commissions or other values based on a range, it is important to use a true range lookup to ensure accurate results. By using the INDEX and MATCH functions instead of VLOOKUP, you can avoid the inconsistencies and confusion that can arise from using TRUE as the range_lookup argument. With a true range lookup, you can be confident that your calculations are accurate and reliable.
References
- Microsoft Excel Help: VLOOKUP function
- Microsoft Excel Help: INDEX function
- Microsoft Excel Help: MATCH function