Data is everywhere, zettabytes (10^21 bytes) of it. But is the data good data?
Most of the time it is not. And bad data comes with big consequences. Today we will learn about data quality. and understand when the data is good data when the data is bad data.
Data Quality and Issues:
Data must maintain some qualities to be good data. If one or more of them are missing then It is bad data. But it’s always not possible to get good data. Understanding the data thoroughly is very important in working with data. If bad data goes unnoticed then it must bring no good. Let’s see the qualities of data.
Completeness
It is not possible to always get complete data. Sometimes you have to drop rows with missing values or sometimes just let it be. But either way you must understand if there is a pattern. Here is why
“The most important data is the data you don’t have” – Abraham Wald
Accuracy
Is the information both correct and precise? Without accurate data whole data analysis is wrong and this will lead to wrong decisions. So the source and the process of data collection must be reliable. And after collecting the data must be verified and examined.
Uniformity
| Date | Activity | Spent time |
| 2020-08-20 | Reading | 2 |
| 2020-08-21 | Sleep | 6 |
| 2020-08-23 | Reading | 45 |
Something wrong in the table above. We humans can easily understand it when it is a small data set. But when the data set is overwhelmingly big or we directly feed it to the machine there will be a faulty model. So there must be a process of checking the uniformity.
Uniqueness
Repetition of data will lead the analysis to wrong conclusion because the model will be over-fitted to some samples. You need to understand the columns to remove the duplicate rows.
| Linda | Blair | 1959 |
| L. | Blair | 1959 |
Timeliness
When the data was collected and when the data is valid for. Is your information up to date? Imagine you use a database say for a student council election campaigning only to find that most of the contacts of that database are a couple of years old.
There’s a saying that Data scientists spend 80% of their time preparing data.
This stage is very important for good quality data.
Thanks very nice blog!
Yesterday, while I was at work, my sister stole my apple ipad and tested to see if it can survive a thirty foot drop, just
so she can be a youtube sensation. My iPad is now destroyed and she has
83 views. I know this is completely off topic but I had to share it with someone!
What’s up, everything is going sound here and ofcourse every one is sharing data, that’s genuinely fine,
keep up writing.
Hello, I wish for to subscribe for this web site to obtain latest updates, thus where can i do it please help out.
You are trusting your dollars and properly becoming with
the internet site that you in the end opt to join.
Previewing Sunday’s Minnesota Timberwolves at Los Angeles Lakers NBA betting odds and lines,
with basketball picks, strategies and predictions.
If the banker has a total of 3, the banker draws if the player drew anything other than an eight.
They are keeping a close watch on the sector and its prospective to bring in income for the state.
Right after that, go to the website’s cashier page
and click on deposit.
There are many ways to begin finding your true self, info is as simple as connecting
with ourselves physically through self-massage. But since the volume increases,
there will also be low-cost knockoffs available.
Research has established that nurturing touch boosts the launch
of oxytocin, a hormone that creates feeling of nurturing and sensation of
trust.
Presented by the Rhode Island Lottery, powered by William Hill and hosted
by Twin River and Tiverton Casinos.
I like the helpful info you provide in your articles. I will bookmark your blog and check
again here regularly. I am quite certain I’ll learn many new stuff
right here! Good luck for the next!
I like the helpful information you provide in your articles.
I’ll bookmark your blog and check again here frequently.
I am quite sure I will learn a lot of new stuff right here!
Best of luck for the next!
Just want to say your article is as surprising. The clarity to your
put up is just nice and i could suppose you’re knowledgeable in this subject.
Fine with your permission let me to snatch your RSS feed to keep up
to date with forthcoming post. Thanks a million and please continue the enjoyable work.
I don’t know if it’s just me or if perhaps everyone else experiencing issues with
your website. It seems like some of the written text in your posts are running off the screen. Can someone else please provide feedback and let me know if this is happening
to them as well? This might be a problem with my browser because
I’ve had this happen previously. Thanks
Hello mates, good paragraph and good arguments commented here, I am
truly enjoying by these.
Yes! Finally someone writes about cheap flights.
me want to sex with a lot of people
whoah this weblog is magnificent i like reading your posts.
Keep up the good work! You realize, many individuals are hunting around for this info, you could aid
them greatly.
I know this if off topic but I’m looking into starting my own blog and
was curious what all is needed to get set up? I’m assuming having a blog like yours would cost
a pretty penny? I’m not very web savvy so I’m not 100% positive.
Any recommendations or advice would be greatly appreciated.
Thanks
Appreciation to my father who stated to me concerning this
weblog, this weblog is genuinely awesome. games ps4 allenferguson games
ps4
excellent issues altogether, you simply received a emblem new reader.
What may you suggest about your put up that you made a few
days in the past? Any positive?
I’m amazed, I have to admit. Seldom do I encounter a blog that’s
both educative and amusing, and without a doubt, you’ve hit the nail on the head.
The issue is an issue that not enough men and women are speaking intelligently about.
I am very happy I found this in my hunt for something relating to this.
Hi there are using WordPress for your site platform?
I’m new to the blog world but I’m trying to get started and create my own. Do you require any coding expertise to make your own blog?
Any help would be greatly appreciated! asmr 0mniartist
I’m gone to convey my little brother, that he should also visit
this weblog on regular basis to get updated from newest news.
0mniartist asmr
Link exchange is nothing else except it is just placing the other person’s
web site link on your page at proper place and other person will also do same in favor of
you.
Thank you for the auspicious writeup. It actually used
to be a enjoyment account it. Glance complicated to far delivered agreeable
from you! However, how can we keep up a correspondence?
It is really a nice and helpful piece of info. I’m satisfied that you just shared this useful
information with us. Please keep us up to date like this.
Thank you for sharing.
Hi to all, how is the whole thing, I think every one is getting more from this site, and your views are fastidious in favor of new visitors.
Thank you for the good writeup. It in fact was a amusement account
it. Look advanced to far added agreeable from you! By the
way, how could we communicate?
scoliosis
I always emailed this webpage post page to all my friends, since if like
to read it afterward my contacts will too. scoliosis
scoliosis
We’re a group of volunteers and starting a new scheme in our community.
Your site provided us with valuable info to work on. You’ve done an impressive job and our whole community will be thankful to you.
scoliosis
I believe this is one of the so much important info for me.
And i’m satisfied reading your article. But want to
commentary on some general issues, The website taste is perfect, the
articles is in reality nice : D. Excellent job, cheers
Hi! I know this is kinda off topic however , I’d figured I’d ask.
Would you be interested in exchanging links or maybe guest authoring a blog post or vice-versa?
My site addresses a lot of the same topics as
yours and I feel we could greatly benefit from each other.
If you are interested feel free to send me an e-mail.
I look forward to hearing from you! Excellent blog by the
way!
Someone essentially help to make significantly articles I would state.
This is the very first time I frequented your website page and up to now?
I amazed with the research you made to make this particular
post extraordinary. Great process!
Wow that was unusual. I just wrote an extremely long comment but after I
clicked submit my comment didn’t appear. Grrrr… well I’m
not writing all that over again. Regardless, just
wanted to say excellent blog!
Excellent post. I definitely appreciate this site. Continue the good work!
Normally I don’t learn post on blogs, but I would like to say that this write-up very pressured me to check out and do it!
Your writing style has been amazed me. Thank
you, quite great article.
I’m not that much of a online reader to be honest but your blogs really nice, keep it up!
I’ll go ahead and bookmark your site to come back later.
Many thanks
Your means of explaining all in this article is
really good, every one be capable of easily be aware of it, Thanks a
lot.