Mr. Grayson is amazing he helped me complete my X Bar / R Bar Assignment and it looks professional and organized. He also showed me how to make models for both of them using line graphs. This made my assignment 100% easier and more precise because I did not manually complete my calculations, excel did them for me.
THANKYOU SO MUCH!! I had absolutely no idea what the hell I was doing and I still don't and yet I have two complete and complicated looking graphs that fit the description so I won't look like a total idiot to my lecturer. Thanks man!
If something is greyed out it typically means there is an editing process happening with a cell. Make sure no cells are being edited. Then, highlight a range of cells for the chart and insert | chart | line and it should work.
I just want to say you are a hero! Thank you so much! I was so lost when I was learning this in class... but you saved me! I wish my prof was as good as you at explaning....
To make a cell a fixed reference you can highlight the cell in a formula and then use the F4 key to put the $ sign in front of both the row and column reference, for example $C$4, and this would make the cell C4 a fixed reference.
We insert $ signs before a column and/or row reference to fix that reference so that when we copy a formula it always refers to that reference cell with the double dollar signs
You mate are a diamond, it's currently half 6 in the morning and I've working all night, but you friend, have this day a bit brighter by not making a pointless 40 minute video. Cracking tie as well lad.
Thank you so much Jim. I am doing my Master in Project Management and your video has helped me a lot. All the best for you and take care, stay safe. God bless you :D
If you google "x bar r control chart constants" you can find a table. For example www.bessegato.com.br/UFJF/resources/table_of_control_chart_constants_old.pdf
Sir first I would like to thank you for such a clear and easily understandable video. My question is the constant values of A2, D3, D4 are taken from a table. I have gone through the Internet in that table based on the Sample size the constant value varies. In this video the sample size is 10 but in the table the values for sample size 10 is different whereas the sample size for 5 the values are matching with the video. Please clear this doubt.
Thank you so much for these videos, not only do they help me out with assignments, but they are a really good learning tool, you show the information well and I feel that I really learn a lot from them! Thanks!!
so many more knowledge to learn, the course i am studying is called operation management, I discovered that the instructor give us many formulas and told us to apply in questions, and never told us how are the formulas derived. Our instructor may be right, deriving those formulas may need advance knowledge of probability, which belongs to Mathematics field. However, learning is fun. It is just too much to learn. One could never know everything in his whole life. I feel so sad for that.
The plotted statistic is the mean (x -bar). The control limits, typically called 3 sigma control limits, are +/- 3 standard deviations of the statistic, or +/- 3 standard errors in this case from the center line. The limits can be set at any multiple of the "standard deviation" from the center line with the decision trade off of time to detect a shift versus the likelihood of a false alarm.
Thank you for posting this video! I've had a hard time understanding during class and I had to do a search while doing my homework. This helped so much! Really appreciate it.
Mr. Crayson: Observations 1, 2, 3, 4, and 5 are, individually, "Rational Subgroups". It is, therefore, necessary to calculate X-bar of each subgroups, i.e., X-bar for Obs 01, X-bar for Obs 02, ..., X-bar for Obs 05, not the way you did it moving horizontally, but vertically, because there might quite likely be a change in the 5M and 1P in each observation. For example, are there the same (1) People, (2) Machine, (3) Mother Nature, (4) Method, (5) Material, (6) Measurement in each observations. If a Special Cause variation is observed, how will you be able to tell which observation it came from, if you calculate your X-bar horizontally across all observations? Not possible, is it? Within each observation, each X-bar and R are individual Bell-Curves with the X-bar being the center of the process for that observation and the R being the dispersion or spread of the Bell-Curve for that observation. However, what you did was essentially conflate the data points for these observations. UPDATE: I READ BELOW THAT THE SAMPLES ARE HOMOGENEOUS which answers why you calculated the X-bar the way you did. However, it doesn't seem to be good practice to do it that way.
When you have a large amount of data and it is not reasonable to obtain every data point you might want to take a sample of 5 to 10. If you can physically and affordably look at every data point then that is fine. And there are charts for individuals data. Of course, if looking at every point you might run into other issues of correlation between points (more of a time series). Traditional SPC assumes independence between samples.
Jim if you see this 8 years later, you are the man. This was beyond helpful
nice. made me happy made me smile
Same here, I hope he is well and doing well
It's true
Hey Jim, you are awesome. Even after 11 years your videos are still helpful.
Mr. Grayson is amazing he helped me complete my X Bar / R Bar Assignment and it looks professional and organized. He also showed me how to make models for both of them using line graphs. This made my assignment 100% easier and more precise because I did not manually complete my calculations, excel did them for me.
I've been near tears trying to figure this out with no guidance in my textbook. This has saved me. Thank you very much!
THANKYOU SO MUCH!! I had absolutely no idea what the hell I was doing and I still don't and yet I have two complete and complicated looking graphs that fit the description so I won't look like a total idiot to my lecturer. Thanks man!
best video ive seen on this topic. Super concise and easy to understand.
Jim, I was stuck on a question for my final, this helped me tremendously. Want to thank you and wish you all the best. Life saver.
This wraps up hours of reading and struggling in about 5 minutes that's easily understood. Thank you!
Very helpful for teaching my university class on Quality Assurance, thanks!
Thank you so much! This was very helpful and straightforward. Every other video I've found for this makes it super extra complicated for no reason.
this is absolutely great! I am a 4th year uni student, understood this more than I did from lecturer!!!
MBA student of UCW, in canada. thank you for this video. it helped me in solving an assignment under operations management class.
In an online course and we barely covered this. Had no idea the formulas or anything. With in minutes this started making sense.
Can't explain how much you have helped me Mr. If a life, may you be added another year sir
Thank you so much for your video! It helped me understand precisely the content and how to use Excel.
If something is greyed out it typically means there is an editing process happening with a cell. Make sure no cells are being edited. Then, highlight a range of cells for the chart and insert | chart | line and it should work.
I just want to say you are a hero! Thank you so much! I was so lost when I was learning this in class... but you saved me! I wish my prof was as good as you at explaning....
Thanks.
Jim, thank you for this!! 11 years later and you're still bailing people out!
To make a cell a fixed reference you can highlight the cell in a formula and then use the F4 key to put the $ sign in front of both the row and column reference, for example $C$4, and this would make the cell C4 a fixed reference.
Jim I was studying for my exam last minute and this video did wonders. Thank you so much. I hope everything is well with you.
This video save me from failing! Thank you!
I wish you were my teacher. You walk through everything step by step. :) Ty for this.
I just want you to know that this saved my stats grade nearly 1 decade later. Thank you Jim!
+rep
Thank you very much Mr.Grayson🙏 Very helpful in my studies in 2022🙏Bless you.
We insert $ signs before a column and/or row reference to fix that reference so that when we copy a formula it always refers to that reference cell with the double dollar signs
Need more people like this on CZcams just simple explanations. Thank you!
Most direct way I've seen it explained. THANK YOU SO MUCH!
thank you Jim, you helped a lot of people
You mate are a diamond, it's currently half 6 in the morning and I've working all night, but you friend, have this day a bit brighter by not making a pointless 40 minute video. Cracking tie as well lad.
Most useful explanation on You Tube. Thank you very much.
Great and quick explanation.
You saved my exam grades, thank you very much!
10 years later and you're still relevant Jim
This video helped tremendously. Connected all the dots for me. Thank you!
This is one of the best videos I've ever seen related to the topic. Thank you so much Mr. Jim. ! I admire you !
Thank you.
Thanks a lot, sir. Your teaching style is simple, effective, and super engaging.
Jim you're the man! Thank you so much it was very helpful for my homework!
Aight no way bruhhhhhh🙉
i love the fax machine sound in background and also the smell of paper being shred
Thank you so much Jim. I am doing my Master in Project Management and your video has helped me a lot. All the best for you and take care, stay safe. God bless you :D
This video was extremely helpful. Thank you for taking the time to put it together and share.
Jim thank you you're killing it in 2021
If you google "x bar r control chart constants" you can find a table. For example www.bessegato.com.br/UFJF/resources/table_of_control_chart_constants_old.pdf
Thank you..!!
Please Pin this link.....Hard searching through 190+ comments
Thanks
This was really well explained
This is a very well explained example. Saves me a lot of time.
Super helpful! I just completed a final case study thanks to you!
v impressive and excellent example of understaning. much appreciated.
pls share X-Bar- S chart also.
Thanks. Glad it was helpful.
it's still very helpful up in 2021:' thank you!
thank you Mr.Grayson your video helped me in my class of QHSE . thank you very much sir.
I know this is now 11 years later, but thank you!
Thanks for simplifying the concept, Excellent explanation @jim Grayson
GOD BLESS YOU. You helped me get an A
Thank you so much for the explanation on making an x-bar chart and R chart! This really helped me out! :D
Very helpful, Jim. Thank you for this.
Sir first I would like to thank you for such a clear and easily understandable video. My question is the constant values of A2, D3, D4 are taken from a table. I have gone through the Internet in that table based on the Sample size the constant value varies. In this video the sample size is 10 but in the table the values for sample size 10 is different whereas the sample size for 5 the values are matching with the video. Please clear this doubt.
Jim, this was very helpful. Thank you very much!
Thank you so much for these videos, not only do they help me out with assignments, but they are a really good learning tool, you show the information well and I feel that I really learn a lot from them! Thanks!!
This video deserves many likes and shares. This helps me in doing ISOM2700 homework
thanks
so many more knowledge to learn, the course i am studying is called operation management, I discovered that the instructor give us many formulas and told us to apply in questions, and never told us how are the formulas derived. Our instructor may be right, deriving those formulas may need advance knowledge of probability, which belongs to Mathematics field. However, learning is fun. It is just too much to learn. One could never know everything in his whole life. I feel so sad for that.
thank you sir, you clearly explain these 2 types of control charts
Thank you! Wonderful step-by-step video, very helpful.
On the Mac, you freeze a cell using CMD + t instead of f4. You can also easily freeze a column or a row if you delete one of the dollar signs.
Thanks
Thanks sir. Straight shooter getting straight to the point, nice!
It is the number of observations (horizontal) for each row .. that will tell us the average of xbar and R (vertical)
The plotted statistic is the mean (x -bar). The control limits, typically called 3 sigma control limits, are +/- 3 standard deviations of the statistic, or +/- 3 standard errors in this case from the center line. The limits can be set at any multiple of the "standard deviation" from the center line with the decision trade off of time to detect a shift versus the likelihood of a false alarm.
Thank you for posting this video! I've had a hard time understanding during class and I had to do a search while doing my homework. This helped so much! Really appreciate it.
Excellent video, thank you for sharing your knowledge.
God bless you sir. This is very helpful
and i got help from you today... thanks a lot sir
Thankyouu sirr, it'so helpfull for me to doing my task 👍🙏
very very helpful sir. thank you for the upload.
Thank you you are a life saver! Got A+ in Industrial Engineering thanks to you!
Very helpful and clear explained. Thank you!
Thank you! Very thorough explanation! THANK YOU, you helped me earn my Six Sigma!
I am going to Pass my final because of you. I appreciate you
Thank You for taking the time to answer............Have a good weekend!
Thanks Jim. I wondered how that was done. I love your videos.
thank you so much, really helpful, i'm really appreciate it Sir.
AWESOME! Easy to understand for me! Thank you!
Mr. Crayson:
Observations 1, 2, 3, 4, and 5 are, individually, "Rational Subgroups". It is, therefore, necessary to calculate X-bar of each subgroups, i.e., X-bar for Obs 01, X-bar for Obs 02, ..., X-bar for Obs 05, not the way you did it moving horizontally, but vertically, because there might quite likely be a change in the 5M and 1P in each observation. For example, are there the same (1) People, (2) Machine, (3) Mother Nature, (4) Method, (5) Material, (6) Measurement in each observations.
If a Special Cause variation is observed, how will you be able to tell which observation it came from, if you calculate your X-bar horizontally across all observations? Not possible, is it?
Within each observation, each X-bar and R are individual Bell-Curves with the X-bar being the center of the process for that observation and the R being the dispersion or spread of the Bell-Curve for that observation. However, what you did was essentially conflate the data points for these observations.
UPDATE: I READ BELOW THAT THE SAMPLES ARE HOMOGENEOUS which answers why you calculated the X-bar the way you did. However, it doesn't seem to be good practice to do it that way.
Thank you for this tutorial Sir, helped a bunch today!
Great video, thank you
This is a great video. Thanks. Logged in to thumb this up and leave a comment. Rarely do that.
Thanks.
When you have a large amount of data and it is not reasonable to obtain every data point you might want to take a sample of 5 to 10. If you can physically and affordably look at every data point then that is fine. And there are charts for individuals data. Of course, if looking at every point you might run into other issues of correlation between points (more of a time series). Traditional SPC assumes independence between samples.
Awesome video, thank you so much!
You sir, were so very helpful! Thank you so much for this tutorial!
EXTREMELY helpful. Thank you so much!
Thank you for your help it help me solve a school assignment!
A2 comes from commonly available tables and is bases on the sample size (n) of the sub group.
thanks for posting! it really helped with my assignment :)
Great refresher! Thanks for explaining!
Thank you! Helped me in preparation for my exam!
Thanks for your feedback!
Thank you so much sir! You just save my assignment
extremely helpful video
to be honest im 14 and have no idea what happening half the time but i like this dude voice and he sound nice so im here
that was so quirky and relatable
Thank you, sir. This tutorial was very good!
My man, you are a life saver!
Cheers Jim. Great tutorial!
Thank you for helping me complete my XBar chart.
Hey Jim. Wanna teach my Six-Sigma class? hahaha
Saved me on my homework thanks
Hope your having a great day
Thank you sir this really helped