*This tutorial will teach you a few quick ways to randomly select names, numbers or any other data. You will also learn how to get a random sample without duplicates and how to randomly select a specified number or percentage of cells, rows or columns in a mouse click.*

Whether you do market research for a new product launch or evaluating the results of your marketing campaign, it is important that you use an unbiased sample of data for your analysis. And the easiest way to achieve this is to get random selection in Excel.

Before discussing sampling techniques, let's provide a bit of background information about random selection and when you might want to use it.

In probability theory and statistics, a **random sample** is a subset of data selected from a larger data set, aka *population*. Each element of a random sample is chosen entirely by chance and has an equal probability of being selected. Why would you need one? Basically, to get a non-biased representation of the total population.

For example, you want to conduct a little survey among your customers. Obviously, it would be unwise to send out a questionnaire to each single person in your multi-thousand database. So, whom do your survey? Will that be 100 newest customers, or the first 100 customers listed alphabetically, or 100 people with the shortest names? None of these approaches fit your needs because they are innately biased. To get an impartial sample where everyone carries an equal opportunity of being chosen, do a random selection by using one of the methods described below.

There's no built-in function to randomly pick cells in Excel, but you can use one of the functions to generate random numbers as a workaround. These probably cannot be called simple intuitive formulas, but they do work.

Supposing you have a list of names in cells A2:A10 and you want to randomly select one name from the list. This can be done by using one of the following formulas:

`=INDEX($A$2:$A$10,RANDBETWEEN(1,COUNTA($A$2:$A$10)),1)`

or

`=INDEX($A$2:$A$10,RANDBETWEEN(1,ROWS($A$2:$A$10)),1)`

That's it! Your random name picker for Excel is all set up and ready to serve:

Naturally, these formulas can not only pick random names, but also select random numbers, dates, or any other random cells.

In a nutshell, you use the INDEX function to extract a value from the list based on a random row number returned by RANDBETWEEN.

More specifically, the RANDBETWEEN function generates a random integer between the two values you specify. For the lower value, you supply the number 1. For the upper value, you use either COUNTA or ROWS to get the total row count. As the result, RANDBETWEEN returns a random number between 1 and the total count of rows in your dataset. This number goes to the *row_num* argument of the INDEX function telling it which row to pick. For the *column_num* argument, we use 1 since we want to extract a value from the first column.

There are a few ways to select random data without duplicates in Excel. Generally, you'd use the RAND function to assign a random number to each cell, and then you pick a few cells by using an Index Rank formula.

With the list of names in cells A2:A16, please follow these steps to extract a few random names:

- Enter the Rand formula in B2, and copy it down the column:

`=RAND()`

- Put the below formula in C2 to extract a random value from column A:
`=INDEX($A$2:$A$16, RANK(B2,$B$2:$B$16), 1)`

- Copy the above formula to as many cells as many random values you want to pick. In our case, we copy the formula to four more cells (C2:C6).

That's it! Five random names are extracted without duplicates:

Like in the previous example, you use the INDEX function to extract a value from column A based on a random row coordinate. In this case, it takes two different functions to get it:

- The RAND formula populates column B with random numbers.
- The RANK function returns the rank a random number in the same row. For example, RANK(B2,$B$2:$B$16) in cell C2 gets the rank of the number in B2. When copied to C3, the relative reference B2 changes to B3 and returns the rank of the number in B3, and so on.

The number returned by RANK is fed into the *row_num* argument of the INDEX function. In the *column_num* argument, you supply 1 because you want to extract a value from the first column.

**A word of caution!** As shown in the screenshot above, our Excel random selection contains only unique values. But theoretically, there is a slim chance of duplicates appearing in your sample. Here's why: on a very large dataset, RAND might generate duplicate random numbers, and RANK will return the same rank for those numbers. Personally, I've never got any duplicates during my tests, but in theory, such probability does exist.

If you are looking for a bulletproof formula to get a random selection with only unique values, then use RANK.EQ + COUNTIF instead of RANK. The complete formula is a bit cumbersome, but 100% duplicate-free:

`=INDEX($A$2:$A$16, RANK.EQ(B2, $B$2:$B$16) + COUNTIF($B$2:B2, B2) - 1, 1)`

- Like RANDBETWEEN, the Excel RAND function also generates new random numbers with each recalculation of your worksheet, causing the random selection to change. To keep your sample unchanged, copy it and paste somewhere else as values (
*Paste**Special*>*Values*). - If the same name (number, date, or any other value) appears more than once in your original data set, a random sample might also contain several occurrences of the same value.

In case your worksheet contains more than one column of data, you can select a random sample in this way: assign a random number to each row, sort those numbers, and select the required number of rows. The detailed steps follow below.

- Insert a new column to the right or to the left of your table (column D in this example).
- In the first cell of the inserted column, excluding the column headers, enter the RAND formula:
`=RAND()`

- Double-click the fill handle to copy the formula down the column. As the result, you will have a random number assigned to each row.
- Sort the random numbers
**largest to smallest**(sorting in ascending order would move the column headers at the bottom of the table, so be sure to sort descending). For this, head over to the*Data*tab >*Sort & Filter*group, and click the ZA button. Excel will automatically expand the selection and sort the entire rows in random order.If you are not quite satisfied with how your table has been randomized, hit the sort button again to resort it. For the detailed instructions, please see How to randomly sort in Excel.

- Finally, select the required number of rows for your sample, copy them and paste to wherever you like.

To have a closer look at the formulas discussed in this tutorial, you are welcome to download our sample workbook to Excel Random Selection.

Now that you know a handful of formulas to get a random sample in Excel, let's see how you can achieve the same result in a mouse click.

With our Ultimate Suite installed in your Excel, here's what you do:

- Select any cell in your table.
- Go to the
*Ablebits Tools*tab >*Utilities*group, and click**Randomize**>**Select Randomly**:

- On the add-in's pane, choose what to select: random rows, random columns or random cells.
- Specify the number or percentage for the desired sample size.
- Click the
**Select**button. Done!

For example, this is how we can select 5 random rows from our sample data set:

And you will get a random selection in a second:

Now, you can press Ctrl + C to copy your random sample, and then press Ctrl + V to paste it to location in the same or another sheet.

If you'd like to test the Randomize tool in your worksheets, feel free to download a 14-day trial version of the Ultimate Suite for Excel. If the tool meets your needs and you decide to get a license, don't miss the **15% off** coupon code that we provide especially for our blog readers: AB14-BlogSpo

I thank you for reading and hope to see you on our blog next week!

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## 18 Responses to "How to select random sample in Excel"

I need your help

Like the first example, I have a list of document numbers (700) that I need to randomly select 80 samples from. Can the same formula be applied? When I do the Randbetween, it only selects the first 80, and although they are in random order, it's the first 80 of the 700 and I need it to be 80 throughout. Is it possible to do a random 80 that cover the range I'm looking for? Thanks in advance!

Hi Jose,

Please see the How to randomly select in Excel without duplicates example. Copy the INDEX RANK formula in 80 cells, and you will get a random selection of 80 numbers from your list.

Hi,

Used your formula with the rank.eq and count if. It doesn't work on a large data set. Instead of picking random numbers it takes the first x amount of numbers and puts them in a random order.

Hi,

I have not tried the RANK.EQ + COUNTIF() although I had suspected it might not work because of the set up. However, if you multiply two RAND() functions, you get less likelihood of duplication in a large list.

Do you know how to extract a random list of numbers from a list of numbers (2nd column), these numbers belong to different products, it is possible to this extraction of numbers per style?

Thank you

Hi,

How can we select one random sample from raw data for specific person to another sheet from one sheet where we have multiple sample for each person?

Thanks! This was super helpful, I used it to make a custom Bingo game from a list of phrases.

It was a bit tricky getting it into a grid form without duplicates, but since there were only 5 columns I only had to make some minor manual adjustments.

Which Excel book would you recommend on

How to use excel to randomize multiple choice questions

Step by Step.

Thanks.

here's how i did on getting random without duplicates:

on b2 type your population or numbers 1,2,3,4,5,etc

on A1 type =rand() drag crosshair down to the number of selection next to b2 down.

on c1 type formula: =LARGE($A$1:$A$9,ROW(A1)) doubleclick crosshair

on D1 type =VLOOKUP(C1,$A$1:$B$9,2,0) doubleclick croshair

press delete on any blank cell to generate new random group

b2 column is your numbers you want ei. bingo numbers 1,2,3,...15

you assign random to each number =rand() on A1 downward for each number

on c1 column type formula to get the largest random number using formula =LARGE($A$1:$A$15,ROW(A1)) and double click crosshair to copy downward

vlookup top five numbers

press delete to generate new top five numbers

Thank you all for this a very good steer indeed.

For some reason I cannot get the "LARGE" function to work where the "n" of its arguments is 9 or more . . . .

Odd Eh!

(Office 385 by the way)

Sorry, I clicke Send too soon.

Here is the link to the on-line MS help re: "LARGE"

https://support.office.com/en-us/article/large-function-3af0af19-1190-42bb-bb8b-01672ec00a64?NS=EXCEL&Version=90&SysLcid=1033&UiLcid=1033&AppVer=ZXL900&HelpId=xlmain11.chm60373&ui=en-US&rs=en-US&ad=US

This was super helpful - thank you for the well written 'how to.'

This will not work. I am trying to pick a word from a list. This formula just comes up with NAME?

Hi, Julie,

the NAME error usually means that you accidentally misspelled the name of the function.

Please make sure that everything in your formula is spelled correctly. If it is, please let me know what formula you used.

I'll try to help.

Hi Julie,

To make things easier, you can download our sample workbook with all the formulas discussed in this tutorial and try them on your list.

how to generate random number from a Range of column, where the range has numbers and empty cells as well. - Excel