Calculate Realized Volatility in R
I am attempting to calculate the realized volatility of the members of the S&P 500 over a specific interval. I am having trouble looping through the index and storing the values.The process should...
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Common breaks and free axes for overlapping lattice histograms
What is the required incantation to achieve an overlapping, faceted lattice::histogram with common break points (across groups, but potentially varying across panels)?For example, assume I want the...
View ArticleHow to divide specific column with rest of columns
I have matrix like this (first column names rest are values, separator i tab):name1 A1 B1 C1 D1 name2 A2 B2 C2 D2 Matrix could be huge (it is mean about hundreds rows and columns). It is allays same...
View ArticleError: Missing $ inserted when using kable
I am attempting to output a latex table using r markdown, kable, and kableExtra. I needed to use conditional logic to add colors to my table with cell_spec. But with the pdf output, it shows latex code...
View ArticleR: ggplot2 density plot shows wrong fill colors
I would like to plot densities of two variables ("red_variable", "green_variable") from two independent dataframes on one density plot, using red and green color for the two variables.This is my...
View ArticleHow can I make the bars in this ggplot appear with gganimate?
I am newbie with R but have some time on my hands and am trying some stuff out. What I like most is animating graphs/plots so that's what I am trying to do. I want to create a plot where you can...
View ArticleEfficiently preserving array dimensions in R
The below R code fills an array of specified dimensions with positive integers generated randomly via a probability vector. subset.haps <- NULL haps <- 1:4 num.specs <- 100 probs <-...
View ArticleWhat is the difference between the various R robust regression functions -...
I am rather new to R and am interested in applying a robust regression technique (due to its ability to better handle outliers and influential data points) to a simple dataset to find good linear and...
View ArticleR how get a date from variable in character
I have data that has dates in a character format, as "JAN2005","FEB2005","MAR2005", such as : Test <- data.table(c("JAN2005","FEB2005","MAR2005","APR2005"),c(436.6,543.1,417.3,687.4)) Is there a...
View Articlehow to sample from an upside down bell curve
I can generate numbers with uniform distribution by using the code below:runif(1,min=10,max=20) How can I sample randomly generated numbers that fall more frequently closer to the minimum and maxium...
View ArticleHow to build a function in R that splits variables into intervals and...
I try to split a Age variable into intervals, calculate mean, sd and a count for the intervals then save the outputs for every interval in a vector and then combine these vectors to a data frame where...
View Articleggforest function returns error message when used with coxph
when applying ggforest() to a coxph object I get the follwoing error messageerror in ggforest(res.cox3, data = Selection_cox) : class(model) == "coxph" are not all TRUE res.cox3is the output of coxph()...
View ArticleHow can I get weighted quantiles from a sparsely populated data frame?
I'm looking for some help with adding some columns to a data frame that I can't seem to get right. My df is about 40,000 rows x 30 columns and is structured like this:Key 0 1 2 3 4 5 6 7 8 9 10 11 12...
View ArticleHow to keep style format unchanged after writing data using openxlsx in R
I am using openxlsx in order to write the outputs of my data. I have used the following code to read my data using readxl. df1=read_excel("C:/my_data.xlsx",skip=2);Now I want to write the output and...
View ArticlePredictors are in random order in sjPlot using tab_model (r) (with...
I'm using the tab_model function in sjPlot in r. This function normally works smoothly for me, however, I noticed that the output table is oddly ordering variables in an order other than is in the lmer...
View ArticleHow to parallelize gsub currently in a for loop in R?
I'm fairly new to trying to run parallel processes in R because most of the data I work with just isn't that large. However, I am no working with a larger set of data where I am attempting to 'find and...
View ArticleIterate over data frame by elements of a list
I am trying to merge two data frames based on a subset on common IDs. Let me demonstrate:library(tidyverse) set.seed(42) df = list(id = c(1,2,3,4,1,2,2,2,1,1), group =...
View ArticleChi-Square test for groups of unequal size
I'd like to apply chi-square test scipy.stats.chisquare. And the total number of observations is different in my groups.import pandas as pd...
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Error with constrained curve fitting through specific points using the cobs...
I'm trying to find the best fitting curve through a given set of points. The fitted curve must also pass through these points. I found an answer on Cross Validated which suggested to use the cobs:...
View ArticleRLE function from scratch in R? [closed]
Can anyone help me write a function similar to the source code of rle from scratch using loops in R? I want to test the performance of using loops vs apply.
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