X-Bar & R Charts are Control Charts designed for tracking the average of sub-grouped continuous data. They consist of two separate charts; “X-Bar” stands for. A classic example of an X-Bar & R Chart is to track the average cycle time to deliver packages by sampling 5 packages per day. Learn more about X-Bar & R Charts in Control Phase, Module 6.2.2 of Black Belt Training. How to Run an X-Bar & R Chart in Minitab 1. Select Raw Data: 2. Go to Stat Control Charts Variables for Subgroups Xbar & R: 3.
Active4 years, 3 months ago
The following data shows the average (
xbar
) and range (r
) for 6samples of size 5 each.how can we draw an
rmuc8xbar
and r
chart using this kind of data using qcc package of R program?(Here we don't have individual observations of the sample but only their means and R values.)1,81244 gold badges1919 silver badges3030 bronze badges
Niret KurianNiret Kurian
2 Answers
Hazem HassanHazem Hassan
You would need the individual values to correctly create an XBar-R chart with qcc or other stats packages. If you only have the summary data (averages of five values), you can chart the XBar data using xbar.one qcc chart type (aka 'individual chart') as depicted in the answer above. That will create a chart that looks fine, but probably won't have the right limits automatically calculated.
The second command above will definitely produce a chart that plots ranges, but the calculated control limits (and hence any rule violations?) would not be valid without knowing the individual results.
If you don't have the individuals, it might be better to treat the 5 point computed values as individuals, and use a moving range chart instead of an R chart to chart between measurement variability. There are examples on how to compute the moving range using R and then plot in qcc.
JohnJohn
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Active1 year, 1 month ago
I am using
There is no way I have found to add excel charts to the excel workbook.
I saw that
Is there a way to do this with R?
eliavseliavsopenXLSX
package to generate excel files from my R
output.There is no way I have found to add excel charts to the excel workbook.
I saw that
python
has a module for creating Excel files that has a class for adding excel charts.Is there a way to do this with R?
1,15222 gold badges1414 silver badges2929 bronze badges
1 Answer
Here's a solution using package
XLConnect
. A small note though, it relies on templates of charts, which you need to create in advance, and it generates new files instead of appending sheets or charts to existing files.It is comprised of two stages:
- Preparing Excel templates for the type of charts you would like to use.
- Updating the template files with the data from R as required each time.
First step: prepare templates in excel, according to the types of charts you will need. You can have all the templates on the same file (in different sheets) or in several different files. When you prepare the templates, include the type of charts you need within the sheet, but instead of referring to specific cells, you need to use 'named ranges'.See for example. You can also use the sample file I created. Note the use of named ranges in the file and in the chart's data references (as
Sheet1!bar_names
and Sheet1!values
instead of Sheet1!$A$2:$A$4
and Sheet1!$B$2:$B$4
). A side note on named ranges in Excel. Named ranges mean you give names to the data you're going to use in the chart, and then you 'tell the chart' to use the named range, instead of an absolute location. You can access the 'Name Manager' in excel in the 'Formulas' menu. The reason we are using named ranges is that
XLConnect
is able to control named ranges, hence the chart will dynamically update when we modify the named range. Second step: use an adaptation of the following code such that it suits your needs. Mostly use your own data frame and update the reference in the
createName
function.This should do the trick.
Note that you can copy and save the template before you start the modifications, if you want to provide it as a new file (and to preserve the original template without overwriting it).
Adi SaridAdi Sarid