Category: R

This tutorial shows how to do the post hoc test using Fisher’s LSD (Least Significant Different) in R. When to use Fisher’s LSD  Typically, it is when you are doing one-way ANOVA with more than 2 groups (e.g., 3 groups). Further,...

Can you use one-way ANOVA for three groups? Yes, you can use one-way ANOVA for three groups (or, three levels). Actually, one-way ANOVA can be used for 2 groups and more than 2 groups. Example of one-way ANOVA for three...

The following shows steps of setup Hayes Mediation PROCESS in R. After setting up the PROCESS in R, we can use Model 4 as a simple example. In the following R code, we first download the data from GitHub. Then,...

The inverse of the Hessian matrix from optim() can be used as the asymptotic covariance matrix for estimated parameters. The name “asymptotic” is due to the direct replace the σ2 in the variance of estimated parameters with the estimated one,...

To use maximum likelihood estimation (MLE) in linear regression in R, you can use either optim() or mle() function. The following provides detailed R code examples. Data and Model Suppose we want to test the effect of teaching method (new vs. old)...

You can use the write.csv() from base R or write_csv() from “readr” package to export a dataframe to CSV in R. write.csv() write.csv(df_1,”csv_file_name.csv”, row.names=FALSE) write_csv() write_csv(df_2,”csv_file_name.csv”) Example 1: Use write.csv() The following is the output of the dataframe df_1. >...

You can generate a vector only containing 0 and 1 in R using sample() and rbinom() functions. sample: sample(c(0, 1), size = 10, replace = TRUE) rbinom: rbinom(10, size = 1, prob = 0.5) In both sample() and rbinom(): Example...