Number of rows by group in r

# dplyr package does this with count/tally commands, or the n() function:
# First, some data:

df <- data.frame(x = rep(1:6, rep(c(1, 2, 3), 2)), year = 1993:2004, month = c(1, 1:11))

# Now the count:
library(dplyr)
count(df, year, month)

# piping
df %>% count(year, month)

# We can also use a slightly longer version with piping and the n() function:
df %>% 
  group_by(year, month) %>%
  summarise(number = n())
  
 dplyr package does this with count/tally commands, or the n() function:

# First, some data:
df <- data.frame(x = rep(1:6, rep(c(1, 2, 3), 2)), year = 1993:2004, month = c(1, 1:11))

# Now the count:
library(dplyr)
count(df, year, month)
# piping
df %>% count(year, month)

# We can also use a slightly longer version with piping and the n() function:

df %>% 
  group_by(year, month) %>%
  summarise(number = n())

# or the tally function:
df %>% 
  group_by(year, month) %>%
  tally()

Source: stackoverflow.com

Similar codes

3 votes215 views1 answer
Comments in r
R
0 vote180 views1 answer
Text in ggplot2
R
0 vote197 views1 answer
Save large nested list to text R
R
0 vote153 views1 answer
R save dataframe as txt
R
0 vote180 views1 answer
Dotted y intercept line in ggplot
R
1 vote156 views1 answer
Expression in r
R
0 vote190 views1 answer
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:
R
0 vote222 views1 answer
R2 in rstudio
R
0 vote190 views1 answer
R - extracting specific columns from a data frame
R
0 vote180 views1 answer
Date difference from today in r
R