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Frequency Distribution: Introduction

You can use Excel or Google Spreadsheet to construct a frequency distribution from a list of data. The frequency distribution for categorical data is by categories. For measurement data, the use of “binning” the data precedes the process of constructing a frequency distribution. Each bin acts like a separate category into which we can pour the appropriate individual data values. Correct interpretation of a frequency distribution requires that you know this important principle: Bins for measurement data (classes) are based on upper class limits.

With large data sets one will want to use the power of Excel or Google Spreadsheet to do the work once you understand the basic principles. We will demonstrate two processes to create frequency distributions. Using Excel or Google Spreadsheet you can create frequency distributions of categorical data by creating “countif” formulas or using the “pivot chart” function in Excel or “pivot table” function in Google Spreadsheet.

Frequency Distribution for Categorical Data :

Countif: Countif is a formula that will count cells that contain information that meets the criteria you set in the formula. To enter the countif formula you will need to enter =countif(beginning cell address:end cell address, criteria) so if you want to count the number of people that rode the bus to campus today, you would type into an empty cell =countif(e2:e12,e12). The first two cell addresses indicate the beginning and the end of the column of data that you want to count bus usage separated by a colon sign. The third cell address indicates the criteria or in this case the term Bus. I can copy and paste this formula for walk, car, and bike only if I add in absolute reference into the formula and change the criteria to match the type of transportation of my choice. Try it with your sample data. You will not want a spreadsheet with a list of numbers without knowing what the data means or represents. See the example below demonstrating how to organized data so that you know what your table represents. The Google Spreadsheet has the formulas displayed. The Excel Spreadsheet has the values displayed. There is also a total indicated on the page. The total is produced by entering another formula =sum(beginning cell address: end cell address) in this case you will see that I summed e15 to e18 for a total of 11. If you check back to the cells 2 through 12 which you can do by entering =counta(e2:e12). It will give you the total count of non-empty cells with words or letters of the alphabet. If you type =count (e2:e12) it will give you the number of cells with numbers in the cells. In this case it will be 0 since we have words not numbers.

Relative and cumulative relative frequency distribution:

Now that we have the frequency distribution of a set of categorical data, we can calculate the relative frequency by creating a third column of data and labeling it relative frequency. For relative frequency we will need to take the frequency of each category and divide it by the total number of students polled. Here we will enter the formula =e15/$e$20, a simple division for my first entry “Bus”. Note that I have used the dollar sign to indicate that this is the sum that I want to use for all my data. It is fixed or absolute if you copy the formula to a new cell the e15 will change as I move down the list. Again a copy of the Google Spreadsheet with the formulas shown and the Excel spreadsheet with the results shown is listed below.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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Source:  OpenStax, Collaborative statistics using spreadsheets. OpenStax CNX. Jan 05, 2016 Download for free at http://legacy.cnx.org/content/col11521/1.23
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