Statistical Process Control: Control Charts for Proportions (p-chart)

[@maracuja320]

I cannot even tell how much your summaries helped me to prepare for my exams! You managed to explain in 4 minutes what my prof. wasn't able to explain properly in the entire lecture. Great job! Thank you so much :)

[@suddude7481]

I exactly said the same thing to my friend before reading the comments section what is explained here in 4 minutes the professor were unable to clear this matter in 1 hour.

[@Luciana01able]

Congrats, Joshua. You have the talent to make things simple, clear, and understandable. Thanks for your videos.

[@JustBidnez]

God bless you man! I've been scrambling all day looking for an explanation for this for an upcoming test. You saved my ass today! Thanks again!

[@azizulhaque1132]

same here bro

[@chriskunsak3963]

I have to echo what I'm seeing others say here... I LOVE YOU!! This was truly the best descriptive video I've seen... better than classes I've attended. I'm sure I'll go back over this a few more times and will book mark it for future reference. Thanks for putting this together!!

[@joshemman]

Thanks for stopping by and leaving a positive comment Chris. A lot of love from here too.

[@chriskunsak3963]

I'm still working on my charts but am hoping you have other video's ... i'll check out your site shortly! Enjoy your Friday... and have a great weekend Joshua!

[@susanokobi2154]

in the last 8 weeks, I have struggled with my course. one day on your page I have learned so much. thank you for making it easy.

[@daarknlovlee]

Thanks so much! I had no idea what my professor was talking about until I watched this video.

[@jacobbiju3355]

Thank you so much man. You guys are the reason we somehow learn the subject without the help of any useless teachers in college.

[@jamiedewberry6702]

Thanks for these videos, they may have saved me on the PE exam because I could not find a good explanation of this stuff and the book info was not making sense Well done and I greatly appreciate what you did.

[@lordprior8052]

thank you, this is brilliant! lectures didn't help at all but this, this is something else!

[@iLykeCahrs]

It takes a South African guy on KZbin to teach an America student. My professor spent 2 lectures covering what you did in 4 minutes.

[@noel1872]

S A M E here I'm from the Philippines, and I'm currently taking BS Industrial Engineering program I badly need this in my Quality Control course

[@officialmintt]

@@noel1872 S A M E here. UK Manufacturing Engineering

[@clye7788]

this is racist

[@ThanosSiozos]

I appreciate your presentation here. When you have different sample sizes n(i) you should adjust the UCL LCL by dividing not by nbar under the root but by the specific n(i) sample size. So UCL/LCL should change with every new sample. In fact they are mirrored around the pbar value.

[@manoharbonu9665]

I'm from India sir from Andhra pradesh state . I really proud of myself. I search proper video.

[@joshemman]

Proud of you, Manohar.

[@amaneeoneal2046]

You are amazing! A real/ natural teacher.

[@nickypandat340]

Your videos is very helpful for me its is short , To the point and easy to understand thank you🙏

[@marwaadel6153]

شرحك رائع، شكرا جدا جدا رزقك الله سعادة الدارين 🤲

[@lildennys3756]

The UCL and LCL will vary when the sample sizes are not the same. In other words, the control limits have to be calculated for each individual proportion (p) based the sample size for that observation (n).

[@我从通化来]

Another sophisticated presentation.

[@saudy999]

I love your teaching style THANK you

[@drlalithsenaweera7395]

Good Explanation.

[@joshemman]

Thanks for taking the time to drop a note.

[@oluwatosinetomi1340]

Thank you for making it look simple.

[@nadianursyuhaidah7286]

This is very straightforward and super helpful, Thank you so much!!

[@beezman]

Thank You! Amazing visual and easy to understand. Straight to the point.

[@kamalthelegendkiller]

Thank you Sir. Appreciate your video!

[@joshemman]

You're welcome, Kamal.

[@christopheryong6345]

Much clarity in this video tutorial. Thank You

[@Nkakajoseph]

Thank you so much, from Kenya JKUAT

[@joshemman]

🙏

[@lilawolfe1547]

Thank you! So much better than my professor

[@mikaelanieva]

you are such a great teacher! thank you for teaching so clearly!

[@kumargandharva9146]

love the way you explain............. hats off for this video

[@ilsando3550]

very clear explanation. Much better than my uni lecture

[@shayiramusthafa3964]

Thank you so much sir. I had no idea about this calculation part. Now i got it.

[@kishorek231009]

Thanks for the video, especially helpful when working persons are solving problems without guidance, I mistook that 3 as cube root.

[@advaitmandlik3901]

Ur a genius man! thanks!!

[@EPICALPwoliaan]

Damn bro you are a legend ♥️💯

[@levyhartlane3621]

Good explanation, keep it up!!!

[@oupamoloi885]

you make things simple bro, thank you

[@hydenlukemanigo4150]

YOU'RE THE BEAST! thanks a lot kind sir

[@RK-li7gr]

THATS AMAZING THANK YOU FOR THE VIDEO Joshua!!

[@selvaprakash1434]

Great job...nice...easy to understand

[@Jubilant_Art]

thank you so much.it gets so easy for me

[@pushprajsingh3500]

thank you so much for this tutorial and the efforts made by you

[@403sheraz]

perfect way of explain, many thanks , keep it up Sir

[@sivachandrasekaran2544]

Very useful and clearly explained. Thank you.

[@jennhollifield9883]

Thank you so much for this. It has helped me very much!

[@marcusagrippa7584]

Thanks Joshua, it helped a lot!

[@sameerbhamra8110]

made it so easy to understand. THANK YOU!!!

[@Rokibul_Islam_TQM]

Thank you so much dear brother, well explained.

[@bobbie_2020]

Excellent video!

[@sparkes3]

Soo very helpful! Thank you so much, sir.

[@B2U567]

You're amazing!!

[@joshemman]

You too!!

[@wandafep]

Thank you for this video, sir. Can I ask a question about p chart, please? I have read this sentence "The p control chart is used to determine if the fraction of defective items in a group of items is consistent over time". I don't understand the meaning of the word consistent in that sentence. For example, the proportion of defective products is 0.05%. I assume that what the word consistent means is that the proportion of products is always 0.05% every day. Are my assumptions correct? Please explain this, sir.

[@joshemman]

For a p-chart, “consistent” doesn’t mean that the proportion of defective products is exactly 0.05% every day. Instead, it means that the proportion of defective products stays within a certain range over time, without showing significant variation or trends that would indicate a problem in the process. For example, if the proportion of defective products is 0.05% on average, a consistent process might have daily proportions that vary slightly around this average, such as 0.04%, 0.06%, or 0.05%. The key is that these variations are within acceptable limits and do not show a trend pattern of increasing or decreasing proportion of defects.

[@wandafep]

@joshemman Thank you very much😅

[@dimitrz2000]

2:50 Just wondering based on Nelson's rule 4 & 7 wouldn't this indicate potential problem ?

[@joshemman]

I'm not familiar with Nelson's rules.Different rules are used in different environments & different goals. You will have to find the ones that apply to yours and implement them.

[@dimitrz2000]

@@joshemman thanks mate 🙂

[@hareendrarathnaweera7877]

Thank sir.. You have done a great job!

[@YxZMyself]

you have a variable sample size..UCL and LCL should reflect that rather than be uniform across the entire data set. correct me if i'm wrong

[@joshemman]

Sure. See 3:00.

[@YxZMyself]

yes i noticed however your formula still gives a single UCL and LCL which is what i'm pointing out. The graph also has uniform control limits for all the days.

[@oliviascarlet123]

It looks like the one value out of control is from the smallest sample size that should have a wider set of control limits. I recalculated the UCL using the actual n value (120). The actual UCL is 0.114 and the process is still out of control. When possible avoid variable sample size since it can be misleading.

[@haroonejaz857]

You are right... I have also read that for variable sample size, the UCL and LCL are also formed in a variable manner (moving up and down) as the graph progresses.

[@sauraodalvi2502]

U explained that soo well , thanks

[@mohammadyacoub8287]

Thanks for this valuable video

[@alluvenkatasubbaiah8428]

I understand clearly thank you sir

[@anirbanchakraborty9132]

nice video sir....like your methodology!

[@rubyleopard]

amazing video mate

[@gurjeevankaur3844]

Its so helpful!!!!

[@emilywang9575]

Very clearly, thank you.

[@necteacher]

your video is very interesting to learn ,may i know which software you used to develop it

[@deborahbalkaranbeadle2695]

Hi Joshua, Do you private tutoring or test prep help?

[@shyamprakash6778]

Very nice . good class

[@saifbinamro7412]

i love you

[@oncheemmanuel5349]

You're good. Thanks

[@jamalyoussef5480]

Awesome expalantion i love it

[@akellochristine4811]

wanted to know at the point of drawing the LCL, UCL, and p bar line in the chart , do we consider the readings on the vertical axis. and do we plot the proportion values against the number of samples. please clarify. am a bit confused at that point.

[@joshemman]

The proportions are the values on the vertical axis. Since this is time series data, the horizontal axis is sessentially a timeline.

[@jananibaskar6936]

Oh my God thank you so much

[@aylamendonca3500]

But if the number of non conformers is 0, so I will count the sample size for that case two? For example, in this example that you show, if the day 2 is 0 (instead of 12) I stil need to consider the sample size 287 in my calculations?

[@joshemman]

Yes. If the number of non-conformers is 0, you still need to include the sample size.

[@rachelofosu1956]

Very helpful video, thank you

[@crystaldominque2586]

Thank you so much! Can you make a video on how to do the p chart in excel?

[@crystaldominque2586]

Just specifically for this problem? I'm having a hard time for some reason doing it in excel.

[@joshemman]

@@crystaldominque2586 See if this helps: kzbin.info/www/bejne/hqWmoWqrf9x8fas

[@lungamthombeni5376]

Well explained thank you so much

[@130_vikassingh7]

Thank you sir 🙏🙏

[@muhammadtayyab8228]

p chart has varaibale sample size, how can you get one UCL & LCL? UCL & LCL will change at each sample? please correct me if I'm wrong

[@joshemman]

See 2:56

[@bhawnajoshi5493]

Nailed it bro

[@MsTohotmos]

More than excellent

[@sureshchandana7738]

Dear Sir,please ex-plane to me why that Y axes use proportion name & why not use unit weight ??

[@joshemman]

This is a p-chart. Therefore, the y-axis should consist of proportions.

[@Buderus69]

And that's Peach Art - thank you

[@siphamandlamathaba2354]

Can you also do EOQ MODELS

[@_MarianaGarcia]

How do you generate that last visual of the p-chart? is it on Word/ Excel?

[@tomstorm7926]

Thanks man.

[@mskindia2841]

What about defectives found in the process though process in statistically under control ?

[@joshemman]

There will always be defectives. If we say that the process in control, we're just saying that things have not gone way out of control. It does not necessarily mean that the process is working perfectly.

[@muzahedmiarz797]

Thanks

[@abumujtabaelemam1305]

Hello. If ihave Tube has Quality characteristic is Out side Diameter we have to measure in one piece or tube in 5 points.the supplier send 10 pieces what the suitable chat for this case.

[@mirandachapman5477]

Many Thanks!!!

[@manorajkumar1053]

Informative

[@sanjeevkumarbathe]

it need past data for constructing chart , how we will construct chart with 1 sample , 6 sample size and 2 non conforming part.

[@agentstona]

Hey bro you make 1 error if sample size is same you have to use NP Chart but if sample size is different than you use P Chart

[@joshemman]

Good one. The issue is that most people don't use the NP chart.

[@santosh_gutte]

Thank you 🤗

[@pauldhinakaran3929]

Could you please post I_MR individual moving range chart .There are lot videos available but nothing explain well n basic like yours' .Pls post for us .

[@Abidkhatrii]

how can i findout the sample size?

[@yousrayousuf9529]

Can anyone please tell that why we put n=200 during the calculation of uper and lower control limits

[@joshemman]

Samples of size 200 were selected each day. See 0:58

[@yousrayousuf9529]

Thank you

[@Satykims]

How we identify the charts in problems??

[@stevenphiri8041]

What happens when you are not give the sample size? please help

[@joshemman]

It has to be given somewhere. Look carefully.

[@narenNBN]

which software do you use for making this video ??

[@joshemman]

+Naren Bobbili PowerPoint and Camtasia Studio.

[@narenNBN]

+Joshua Emmanuel thanks a lot for replying with such spontainity man !

[@huntersingleton5008]

this is all great but what about z score?? you just completely ignored it

[@suddude7481]

Just super

[@sanjaypal5139]

please describe np chart and u chart

[@444.nyokabi]

Thank you sir

[@abumujtabaelemam1305]

I have to check the out sude dimeter in 5 points so for 1 tube i have 5 points