How to compute weighted mean in R?

Use weighted.mean:

> weighted.mean(z$size, z$count)
[1] 4

Related Posts:

  1. Emulate ggplot2 default color palette
  2. ggplot wrong color assignment
  3. How to rename a single column in a data.frame?
  4. t-stat for feature selection
  5. Could not find function “%<>%” with dplyr loaded
  6. R Error in x$ed : $ operator is invalid for atomic vectors
  7. ggplot2 line chart gives “geom_path: Each group consist of only one observation. Do you need to adjust the group aesthetic?”
  8. How to open CSV file in R when R says “no such file or directory”?
  9. Error: could not find function “%>%”
  10. What does na.rm=TRUE actually means?
  11. Error in if/while (condition) {: missing Value where TRUE/FALSE needed
  12. How to change legend title in ggplot
  13. Changing column names of a data frame
  14. Counting the number of elements with the values of x in a vector
  15. Non-numeric Argument to Binary Operator Error in R
  16. Non-numeric Argument to Binary Operator Error in R
  17. Error in file(file, “rt”) : invalid ‘description’ argument in complete.cases program
  18. Error in Confusion Matrix : the data and reference factors must have the same number of levels
  19. Error in colMeans(x, na.rm = TRUE) : ‘x’ must be numeric, What should I do in this situation?
  20. Extracting value specific rows in R
  21. “Error: Mapping should be created with `aes()` or `aes_()`.”
  22. Principal Components Analysis:Error in colMeans(x, na.rm = TRUE) : ‘x’ must be numeric
  23. plot.new has not been called yet
  24. Error in lm.fit(x,y,offset = offset, singular.ok,…) 0 non-NA cases with boxcox formula
  25. Persistent invalid graphics state error when using ggplot2
  26. Logistic regression – eval(family$initialize) : y values must be 0 <= y <= 1
  27. Opposite of %in%: exclude rows with values specified in a vector
  28. What does %*% mean in R [duplicate]
  29. Why am I getting “algorithm did not converge” and “fitted prob numerically 0 or 1” warnings with glm?
  30. Add text to ggplot
  31. Rotating and spacing axis labels in ggplot2
  32. Opposite of %in%: exclude rows with values specified in a vector
  33. Using Caret Package but Getting Error in library(e1071)
  34. Reading PSV (pipe-separated) file or string
  35. plot.new has not been called yet
  36. Subscript out of bounds – general definition and solution?
  37. Why I get this error writing data to a file
  38. Remove NA values from a vector
  39. Correlation between multiple variables of a data frame
  40. character string is not in a standard unambiguous format
  41. Remove rows with all or some NAs (missing values) in data.frame
  42. duplicate ‘row.names’ are not allowed error
  43. Function to clear the console in R and RStudio
  44. Adding a regression line on a ggplot
  45. Invalid factor level, NA generated warning
  46. invalid type (list) for variable
  47. Error: unexpected ‘}’ in “}” in R [duplicate]
  48. How to convert a factor to integer\numeric without loss of information?
  49. Having trouble setting working directory
  50. Understanding `scale` in R
  51. Add empty columns to a dataframe with specified names from a vector
  52. `fread` with headers with special characters (latin1) and unusual nested quotes
  53. Generate a set of random unique integers from an interval
  54. How to move or position a legend in ggplot2
  55. Rotating and spacing axis labels in ggplot2
  56. “installation of package ‘FILE_PATH’ had non-zero exit status” in R
  57. Plot multiple lines (data series) each with unique color in R
  58. reshape2 melt warning message
  59. Replace all particular values in a data frame
  60. Plot a legend outside of the plotting area in base graphics?
  61. Still getting error in dev.off() : cannot shut down device 1 (the null device)
  62. How to sum a variable by group
  63. lme4 error: boundary (singular) fit: see ?isSingular
  64. dcast warning: ‘Aggregation function missing: defaulting to length’
  65. How to get summary statistics by group
  66. Non-conformable arrays error in code
  67. object of type ‘builtin’ is not subsettable
  68. What causes an R script to get Killed?
  69. Combine two data frames by rows (rbind) when they have different sets of columns
  70. Function to calculate R2 (R-squared) in R
  71. dplyr mutate with conditional values
  72. `Error in file(con, “r”) : cannot open the connection` from running BRugsFit()
  73. Too few periods for decompose()
  74. How to solve prcomp.default(): cannot rescale a constant/zero column to unit variance
  75. incorrect number of subscripts on matrix in R
  76. How Do You Compare Two Strings in R?
  77. changing title in multiplot ggplot2 using grid.arrange
  78. How to split data into training/testing sets using sample function
  79. Creating a Plot Window of a Particular Size
  80. Error:attempt to apply non-function
  81. Error in xj[i] : invalid subscript type ‘list’
  82. How do you specifically order ggplot2 x axis instead of alphabetical order?
  83. Sample random rows in dataframe
  84. Error in eval(predvars, data, env) : object ‘Rm’ not found
  85. How to initialize a vector with fixed length in R
  86. Efficiently sum across multiple columns in R
  87. How do I clean up R memory without restarting my PC?
  88. Side-by-side plots with ggplot2
  89. lib unspecified & Error in loadNamespace
  90. How to convert data.frame column from Factor to numeric [duplicate]
  91. Merge data frames based on rownames in R
  92. What do these R glm error messages mean: “Error: no valid set of coefficients has been found: please supply starting values”
  93. Remove columns from dataframe where some of values are NA
  94. why nrow(dataframe) and length(dataframe) in r give different results?
  95. how to add dashed horizontal line with label in ggplot
  96. cbind warnings : row names were found from a short variable and have been discarded
  97. What is the meaning of the dollar sign “$” in R function()?
  98. Filter rows which contain a certain string
  99. How can I change the name of a data frame
  100. How to calculate combination and permutation in R?

Leave a Comment