R

Here 2 options for subsetting: Using subset from base R: Using subset the argument of geom_line(Note I am using plyr package to use the special . function). You can also use the complementary subsetting:

Well, the functions do different things. First, there are two internal implementations of date/time: POSIXct, which stores seconds since UNIX epoch (+some other data), and POSIXlt, which stores a list of day, month, year, hour, minute, second, etc. strptime is a function to directly convert character vectors (of a variety of formats) to POSIXlt format. … Read more

I have plotted a line plot. I have added a horizontal line on the plot. How to take horizontal line red dashed?

It means that you have objects (functions, usually) present in your global environment with the same name as (exported) things in your package. Type search() to see the order in which R resolves names. The solution is to either, don’t create objects with those names in your global environment rename the objects in your package … Read more

I have a ordered data frame and want to know the number of the last row. gives me different results of I would like to understand why is that. It seems that nrowgives me the answer I’m looking for, but I don’t understand why.

The data: This will remove all columns containing at least one NA: An alternative way is to use apply:

I was wondering if there was a built-in function in R that would compute the standard deviation for columns just like colMeans computes mean for every column. It would be simple enough to write my own mini function (a compound command that invokes things like apply with sd), but I was wondering if there was … Read more

There’s nothing wrong, glm is just picky when it comes to specifying binomial (and Poisson) models. It warns if it detects that the no. of trials or successes is non-integral, but it goes ahead and fits the model anyway. If you want to suppress the warning (and you’re sure it’s not a problem), use family=quasibinomial … Read more

I am trying to run a correlation matrix. My variables are numeric. I am unsure why I keep getting this message? which gives the error Error in storage.mode(x) <- “double” :‘list’ object cannot be coerced to type ‘double’

The specific error is caused by you using & to separate lines of code; this does not work because that is a logical operator in R. You could use ; instead or newline characters to separate lines. However, taking a step back you are trying to compute the top 3 months of the year for … Read more