How to assign the height of the stratum and flows manually (separately)?

[peter308]

Dear Cory,

Suppose I have the x-axis as two years, say 1991, and 1992,
and I have two strata at each year, so totally four strata.

Let's call the two strata at year 1991, "1991_1", and "1991_2", and the two strata at 1992, "1992_1", "1992_2".

And suppose there are only two flows in between the two years, say from 1991_1 => 1992_1, and from 1991_1 => 1992_2.

How to assign the stratum height of "1991_1", "1991_2", "1992_1", and "1992_2" as 40,30,50,45

and the flow size from 1991_1 => 1992_1, and 1991_1 => 1992_2 as 40, 50, respectively?

Although this setting seems quite trivial, but I found it difficult for me to plot it from using ggalluvial.

I feel the height of stratum seems to be pre-determined by the sum of the flows at each stratum. Is there a way that I can assign it differently other than the sum of the flows at it?

Can you help on plotting this rather simple example? Tks.

With warm regards,
Peter

[corybrunson]

@peter308 it sounds like you have an existing data set in R that you've attempted to visualize. Could you share your code with these data and your attempt? You can use dput() to obtain code to re-generate your data set. Stack Overflow has a guide to writing reproducible examples that you can also refer to.

[peter308]

Dear Cory,

Yes, I have the data. it is attached for your reference.
I want to plot the flow size according to column "n" instead of column "prop". The sratum size is correct.
Can you teach me how to do that using ggplot2 and ggalluvial in R? Thank you!

p.s. I am guessing something like ... + geom_flow(aes(y=after_stat(ifelse(flow=="from", n,"")))) + ...
shall work, but I think since you are the expert, maybe I shall learn the formal way on how to do that.

1993_1994.csv

with kind regards,
Peter

[corybrunson]

@peter308 thanks for sharing the data, but have you also made a plot that is close to what you want? If you can produce a plot and explain what you want to change, then i can probably help you get there. But if you have trouble generating a plot in the first place, then it may be a problem with the data.

[peter308]

Dear Cory,

Thank you. I have indeed a plot already. Kindly check it in the attached file.
What I want is simple, I want the flow size (height) to be exactly, or a scaled version the number (n) that I showed inside the flow in the figure.
Feel free to let me know if you need further information (code or data) from my side. Tks.

with warm regards,
Peter

test_1993_1994.pdf

[corybrunson]

Hi @peter308, yes please, if you could share the code you used then i'll start from there to see if i can adapt the plot to your needs. (In general, a combination of existing code and desired change is the best way to open an issue.)

[peter308]

Dear Cory,

Pls find the attached files for reference.

raw data:

test.csv

R script for plotting the alluvial diagram

test.R.txt

output figure:

test.pdf

Thank you for your help.

with best regards,
Peter