Lab 3 Calculate the standardized degree for each actor.

[n-galanos]

I need some help with Part 1, Question 3: Calculate the standardized degree for each actor.

When reviewing the tutorial (I attached a screenshot of what I'm referring to), I am unclear about how to connect LondonGangNet to how the tutorial shows how to calculate the standardized degree.

I have tried many different ways such as;

deg.g <- colSums( as.matrix (LondonGangNet))

deg.g g <- dim( LondonGangNet )[1] s.deg <- deg.g / ( g-1 ) s.deg numeric(0)

I believe I messed up along the way with my coding since I came up with: numeric(0).

Im also having an issue with standardized degree for Part 2 as well, getting the error "numeric(0)".

When I try to continue by coding the Mean, I receive the same "numeric(0)" error.

[n-galanos]

No matter how many different ways I try the codes, I'm still coming up with "numeric (0)" when running standardized degree for each actor.

[jacobtnyoung]

hi @n-galanos ! Sorry you are running into this issue. The error is on the 4th line of your code. Let me show you.

Run this:

# load the libraries we need
library( sna )
library( network )

# define the path location for the file
loc <- "https://github.com/jacobtnyoung/sna-textbook/raw/main/data/data-london-gang-net.rds"
LondonGangNet <- readRDS( url(loc ) )

# define the degrees
deg.g <- colSums( as.matrix( LondonGangNet ) )

# define the number of nodes
g <- dim( LondonGangNet )[1]

#print out g
g

You should get an indication that the object g is NULL. This is because the object LondonGangNet is one of class network, not matrix. So it does not have dimensionality that the dim() function is looking to report.

The way to overcome this is to just continue to coerce the object to a matrix, like you did in the first line of your code. So, try this:

g <- dim( as.matrix( LondonGangNet ) )[1]

Make sense? Let me know if you are still running into issues!

[n-galanos]

Yes that worked!! Thank you so much! Is this what I will do for Part 2 Question 3 as well using CocaineDealingNet?

[jacobtnyoung]

Hi @n-galanos ! Yes, you can do it that way.

Or, you can use the degree() function. That is easier, I think, but it is your call.