Ggplots with one variable

[Finn]

Hi! I'm very new to R, so sorry if this is an obvious question. I'm trying to visualise a relationship between weight (numeric) and sex (factor), however I only want to look at males and not all entries within the sex factor.

How do I have R only consider one value within a column? Should I use the drop function? If anyone could point me in the right direction that would be awesome.

Thank you, sorry if anything isn't clear.

[rama27]

One solution might be to subset males into new dataframe. Another solution is to create a column with dummy variables that equals one for males.

For example:

df$Male <- ifelse(df$Sex == "male", 1,  0)

And now try your ggplot.

[andresrcs]

Here is an example with made-up sample data (BTW you should make your questions providing a REPRoducible EXample (reprex) as the one bellow).

library(tidyverse)
set.seed(123) # For reproducibility

sample_data <- data.frame(
    weight = runif(10, 50, 80),
    sex = sample(c("Male", "Female"), size = 20, replace = TRUE)
)

sample_data %>% 
    filter(sex == "Male") %>% 
    ggplot(aes(y = weight, x = sex)) +
    geom_boxplot()

^{Created on 2020-02-02 by the reprex package (v0.3.0)}

[Finn]

I completely forgot about subsets, shows what a novice I am!

NoFemale <- FishData %>% filter(Sex == "male")

seemed to work for my purposes but I'm unsure if this is the best way. I'll try your other suggestions method as well.