Cole questions

Cole answers

• sample a lognormal distribution to an exact mean and sd
• Excluding outliers, from the regression line fitted through a scatterplot, without removing the outlier from the plot
• Rolling count of distinct years
• Replacing NA of numbered column in list of data frames
• Return original data set after top_n
• Sum/count between two dates in R
• Is there a faster method for making paired comparisons than expand.grid in Base R?
• How I can take mean for different subsets of a specific column in a data.table?
• applying a dist function rowise in custom function
• Create Combinations in R by Groups