Lecture 1.2 - Introduction and Types of Data - Understanding data

Prof. Usha Mohan
Department of Management Studies
IIT Madras
Learning outcomes:
1. Appreciate how Statistics relies on data.
2. Understand what data is and the purpose of collecting data.
3. Understand the process of data collection and the source of data.
4. Distinguish between Structured and Unstructured data.
5. Appreciate the usefulness of Structured data.
6. Create, download, and manipulate datasets.
7. Work on a subset of a dataset.
8. Identify variables and observations from the dataset and appreciate the difference between having no data and the case when data has value zero in the dataset.
9. Frame questions from the dataset relevant to the information being sought. IIT Madras welcomes you to the world’s first BSc Degree program in Programming and Data Science. This program was designed for students and working professionals from various educational backgrounds and different age groups to give them an opportunity to study from IIT Madras without having to write the JEE. Through our online programs, we help our learners to get access to a world-class curriculum in Data Science and Programming.
To know more about our Programs, please visit :
BSc Degree in Programming and Data Science - onlinedegree.i...
Diploma in Programming / Data Science - diploma.iitm.a...

[@shashvat.dwivedi]

I don't understand the criticism for her teaching. I found it brilliant.

[@aarshaleena4242]

Me too🤗

[@mythreyisankar6580]

Yeah.....she teaches with much patience

[@gouravchoudhary2840]

Kaun ullu ka patha shikayat kr rha h

[@bronjo9343]

She teaches brilliantly, Maybe it's her high pitched voice some people find irritating, as high pitched voice is used mostly for yelling and when there is a serious issue at hand. A low pitch voice is always perceived as relaxed and calm. So, this is my descriptive analysis of the available data.

[@venkat2217]

@@bronjo9343 The last sentence decribes how you're listening to these lectures!

[@swethasuresh6511]

Once again, IITM proves its vision to provide quality education by having such amazing faculty like Prof. Usha Mohan teach Statistics. I personally think Statistics is tough but Prof. Usha Mohan carries the course forward in a breeze. Thank you Professor!!

[@Aryan.24200]

You are right !

[@abhilashkokkonda1713]

She is an excellent teacher I have seen so far in this course

[@namratagupta7659]

Main headings- What is data? Why do we collect data? Structured and Unstructured Data Variables(columns)and cases(rows)

[@ayuuadoughnut3733]

The way she taught is actually has me captivated and curious to know more about this course. Thank you!

[@kaushikchandrasekhar5401]

She is brilliant and covers all aspects thoroughly 👏 .

[@swagat457]

Hi IITM, Thank you for launching such programs and giving everyone equal opportunity. A few suggestions :- I enrolled into Bsc program and except for computational part rest all lectures were utterly boring. There is no doubt about Professor's knowledge but going through those lectures felt like a torture. Please understand in today's digital world what really matters is how creatively you present your content. You may refer to channels like "Programming with Mosh" or Harvard University's CS50 Into. Honestly, nobody cares how educated the video presenter is what they really care about is whether you can keep them engaged through out in way that if they don't understand something they would love to go back and play back the video. * Please don't purely use screen recorder and work on video creation part and like Editing, Transitions,Video Quality, Audio Quality, Infographics, Animations. [For now Students are just enrolling because it's IIT but once you have worked on the video creation part they'll enroll to get educated on the subject. Regards,]

[@ramprasath888]

s it's true

[@vigneshparameshwaran4921]

finally, someone who is sane. this absolutely true. Forget about quality. Atleast they could have put in some professor who can speak half decent english and not some idiot who blabbers throughout the video. this so called professor is the worst i have ever seen. She has no thought for the students, that they have to bear with her illogical sentences and my god the fake tone and accent to cover her bad teaching. Does she ever hear herself speak for god's sake.

[@slayyingwithshivya7611]

Ya I totally agree with your point

[@ALLINONE-zp4zo]

yes its true iam also join ths programming because its iit madras university but please improve the videos use digitally and animated things so you can create a interest to learn this course or subjects Regards

[@Raghav02]

what do you want knowledge or entertainment ?

[@AshishPandeyy]

Watch at 1.5x, that's normal.

[@aakashsreekumar2104]

dude... i also do that...

[@NidhiSingh-pr6if]

2x speed for all 😅😂 But the content n the way to represent it is really awesome 😍

[@ameenapatel5040]

Excellent teaching 👍🏻👍🏻

[@sharmilak1738]

Well explained mam ....thank you.

[@iitmadrasgraded]

Excellent explaination.

[@shubhamGaming212]

Revision What is data? Why data is collected? Structure and unstructured data Variable (columns) varies Cases (rows)

[@sugandhisaxena6965]

Can anyone tell me how are reports not unstructured data? I mean how can you represent report under variables/attributes ?

[@deepcreations1264]

If anyone making a dataset not in a perticular time and day or perticular thing ,then we can say it unstructured data.

[@siddarth5727]

the first 1 minute, ive been hearing it everyday

[@ANINDOSINGH]

Practical is best

[@RohitKshirsagar]

I would request the writing software be of a better variety. It's difficult to make out what's written during the lecture. May be what's written during the course can actually be converted to a slide ? Just my 2 cents.

[@achyutkeshinisudan4942]

How did you comment so early on this video?

[@rajtiwari6645]

@@achyutkeshinisudan4942 week 1 content was available as demo before commencement of course.

[@achyutkeshinisudan4942]

@@rajtiwari6645 Ooh..I didn't know that

[@lilpumpp8079]

@@achyutkeshinisudan4942 point hau 🤣🤣🤣🤣

[@rushikeshpachore7654]

where do we get ppt of this course? is it available or not?

[@VishalGupta-xw2rp]

Done, Excellent and Lovely Teacher. I couldn't have asked for more. She's Superb ♥️

[@AMITSINGH-mn1vh]

@25:30 "Rows represent cases: For each cases, same attribute is recorded." I am unable to understand the meaning of this line. Can anyone please clarify. I think "Some" is missplet as "Same".

[@vishnupv6867]

same attribute of that case. the attributes of kohli should be written in same row.

[@hub8-hyd]

It should be "For each case, the same attributes (variables) are recorded", the values might differ.

[@advaith2241]

Here the attributes are referred to as variables(which represent columns) .So each cases(which represents rows) has it's own value for each attributes(variables) and the 'same' set of attributes(variables) is assigned for each cases(rows).

[@manasverma7278]

@@advaith2241 thank u soo much

[@NISHANT_YADAV_IITM]

Well explained ❤

[@OK-fo5tm]

There are some topics I am unable to understand. But marvellous teaching nonetheless

[@_mr_gigi]

Thank you ,Mam.

[@DinushaGalagedara]

Great madam i understand it , love from sri lanka,

[@likithdevaram6081]

Thank you mam

[@vanni.]

Legends watching it at 2x 😂

[@shibashisnath2417]

😅

[@droidrex3224]

Nah normal people watching it at 2x and legends watching at 1x

[@ajormathew]

.🤞🤞

[@darkknight5730]

does anyone eles cant see the assignments or the linnks in their current course thing on the website

[@ankash9669]

Under the current courses heading click on which subject you want to do assignment and after that you get a down arrow of week 1 heading click that under that heading you will find the assignment and activites assigned.

[@parikshitjuneja]

Is there someone in first year undergraduate persuing this course??

[@grishmashringarpure3160]

me xd

[@parikshitjuneja]

@@grishmashringarpure3160 which college?

[@paritoshsahu303]

Me too

[@nandjshah19]

Yes

[@abhinavjha5486]

Not me 😂😏😏😎

[@naveenvic]

My favourite teacher

[@aakashsreekumar2104]

27:43 its actually 5 ' 2'''

[@MdArif-jt7wd]

Appa Usidhamani😊😊😊...

[@MdArif-jt7wd]

At 1:08 She symbolically says that we are spending half amount of our food on petrol😅😅😅 #PetrolHike

[@Raghav02]

food for one time , 100rs pertrol in bike/activa for 3 days

[@itachisama3105]

anyone now grinding for qualifier at 16th oct 😬

[@HeyyyDeepak]

Well explained.

[@dunk_27]

Bro clss kb sai hora hay

[@HeyyyDeepak]

@@dunk_27 classes are already started.

[@dunk_27]

@@HeyyyDeepak ya I know but from which date you have get access to lacture

[@dunk_27]

@@HeyyyDeepak from how many days😭

[@HeyyyDeepak]

@@dunk_27 For Data Science it started from 1st June for Electronic Systems it started from yesterday.

[@adityatiadi2961]

Mam i can't understood what are u doing at 19:13

[@adityamahesh1179]

simply maam is just telling that the fees variable's data isnt varying (constant) and the other data is varying

[@adityatiadi2961]

@@adityamahesh1179 are no aditya mam is writing something but we can't see in the board

[@adityamahesh1179]

@@adityatiadi2961 Probably she is rubbing I guess..see the rubber is opened during that time..!!

[@this_Is_n0_One]

@@adityatiadi2961 She is writin gwhat she speaking, colemn names are Names, Fees, Marks ; and the rows have names as Anjali, Brandon, Callum, Deepak and fees paid by them is 30k each which is not varying, and marks is varying which we're taking as variable.

[@ajormathew]

arey... She is teaching at 19:13..

[@plekshmi6004]

mam, can i get full notes of this 149 videos

[@Beyondfutura]

Are u also prepare for qualifier

[@1shraddhapatel1]

Sis are you preparing for BSC data science IIT Madras for entrance

[@shahnawaz007]

Legend are watching 2x and say it's normal speed 🗿😂😂

[@freyamaheshwari9412]

Some notes

[@Razia-uk6xp]

watch at 1.5x

[@abinashrout8925]

I generated data by liking and commenting 🤖

[@RakeshGupta-m5z]

Hey are u preparing for 27 oct qualifier

[@054_nirajkumar3]

थैंक्यू

[@freyamaheshwari9412]

Pdf ppt alsoo

[@cutie2463]

long video

[@tarungami2578]

I am giving a data as comment 😂

[@bhavdeepsingh9799]

Why so slow

[@nxtthor-18]

18:32

[@vigneshp3747]

getting a stroke trying to understand what she is trying to tell. For god's sake, does she listen to herself speaking?

[@thepassioner3341]

Yeah bro

[@LiftwithAnil]

all lectures are boring

[@sanchitapathak3800]

Very bad. .😞😞😞

[@ine-senpai2283]

Dear IIT Madras Online BS Degree Program, I am writing to you today to express my concerns about the quality of the program. I am a student who has just enrolled for the QUALIFIER exam, and I am worried that the content of the program is not up to par. I have been watching some of the pre-recorded lectures, and I am disappointed with the quality of the content. The lectures are dry and boring, and the professors do not seem to be passionate about teaching. I have also found that the website portal is poorly designed and difficult to use. I am aware that the program is online, and that there are some limitations to what can be done in this format. However, I believe that the quality of the content should not be sacrificed. I am paying a significant amount of money for this program, and I expect to receive a high-quality education. I would like to suggest some improvements that could be made to the program. First, the lectures should be more engaging and interesting. The professors should be more passionate about teaching, and they should use a variety of teaching methods to keep students engaged. Second, the website portal should be redesigned to make it easier to use. The portal should be more user-friendly, and it should provide students with more resources and support. I believe that these improvements would make the program much more valuable for students. I am confident that IIT Madras can provide a high-quality online education, and I hope that you will consider my suggestions. Thank you for your time. Sincerely, sugam chaudhary

[@Raghav02]

these videos are not going anywhere for the next 4-5 years 😂, it wont be changed

[@ine-senpai2283]

@@Raghav02 pata hai yaar ye chatgpt se legwaya hai orginol comment me to mene khde koti sunai thi a.i ne profsnol bana deya

[@ine-senpai2283]

@@Raghav02 ye original comment befour a.i information toh book me bhi hoti hai tume explane hi nhi karna a rha to kis baat ke techer ho iit ka computer thinking lec are v.good for example they seem to be passionate about teaching example for jee prap i study in p.w they train their teacher how they can teach us in interesting way and in live classes with low fee you have to give us recoding lec(0 cost for poor recording + teacher pay around ₹ 8.1 Lakhs to ₹ 9.9 Lakhs per year. for offline but in online 5 lac max) + avg website portal (between INR 8,000 and INR 40,000 a year, but most average around INR16,000 a year ) + some event which people fron north india will not com more likely this 4 year cource can be cost around 80k - 1 lac max for every student with good quality only if its not a side income for iitm you iitm have your big brand with good amount of money even then content is way worse then worse free content in youtube it's just a review from me as a student which just enroll for QUALIFIER exam i dont know cource might improve after QUALIFIER exam just a hope and i am taking this for b.s degree i have full rights to write my opnion

[@l8lhl8l5]

@@ine-senpai2283 tum bhi prepare kr rahi ho kya entrance k liye ?

[@ine-senpai2283]

@@l8lhl8l5 ha kar raha hu ladka hu bc