Blog

Blogs about R, Python, machine learning, data science, and visualisation

Data visualization for survey data

blog
ggplot2

Many tutorials online are about general data visualization. This post aims to showcase some tricks for survey data
Jul 4, 2023
Jihong Zhang

A tutorial for forester R package

tutorial
package
As contributors of the R package said in their github website:
Jun 28, 2023
Jihong Zhang

One Template for Quarto Report

A template used for academic reporting
Jun 27, 2023
Jihong Zhang

Moving My Website to Quarto

Since June 25, 2023, I start to move my…
Jun 25, 2023
Jihong Zhang

A Conversation between R and Python on Data Analysis and Machine Learning

blog
R
PyTorch
Deep Learning
When I play with machine learning using python and R, I keep wondering whether I can combine R and Python code in a better way, such as using R for data…
Jun 20, 2023
Jihong Zhang

Latent Class Model: Batch Mplus using R on Mac

blog
LCM
R
Mplus is a very popular program for varied latent varaible modeling: (1) Structural equation modeling (2) multilevel analysis (3) mixture modeling (latent class model). R, in the…
Jun 10, 2023
Jihong Zhang

 

Dissertation Defence

TITLE: A novel method for model selection in Bayesian Diagnostic Classification Modeling
Oct 23, 2022
Jihong Zhang

NSF Grant on Bayesian Cognitive Diagnosis

Data visualization using ggplot2
The NSF grant awards can be easily searched via NSF website. Check Active Awards and type “Bayesian & Cognitive Diagnosis” into the search box. Two things I’m really interested in: (1) Who as…
May 21, 2022
Jihong Zhang

Web Scraping Academia Institute’s Grant Fundings using R

blog
Web Scrapping

How to use R for web scrapping
May 12, 2022
Jihong Zhang

Power Analysis for Structural Equation Modeling

R
rshiny
webpower
lavaan
blog
tutorial

Showcase current software used for power analysis of Structural Equation Modeling
Apr 29, 2022
Jihong Zhang

[Workshop] Creating Academic Blog via R

This post reviews the procedure of creating Github Pages Website using distill package and Github Pages in a step-to-step way.
R
Github
Rstudio
Workshop
Michael Clark has a great workshop in his blog introducing distill package. I suggest readers check it out first.
Apr 24, 2022
Jihong Zhang

 

Gradient Descent Algorithm via julia

This tutorial illustrate how to use julia to conduct a gradient descent algorithm
julia
algorithm
32 rows × 12 columns (omitted printing of 4 columns)
Aug 30, 2021
Jihong Zhang

 

Health Care Data Analysis with Apple Watch

blog
R
health
The data contained within Health app on iPhone can be saved and exported for other uses.…
Jul 6, 2021
Jihong Zhang

Visualization for Process Data

R
ggplot2
tutorial
This tutorial aims to explore various types of tools of visualizing the process data.
Jul 4, 2021
Jihong Zhang

 

[Pre-print] A Model Comparison Approach to Posterior Predictive Model Checks in Bayesian Confirmatory Factor Analysis

R
Posterior Predictive Model Checking (PPMC) is frequently used for model fit evaluation in Bayesian Confirmatory Factor Analysis (BCFA). In standard PPMC procedures, model…
Jan 31, 2021
Jihong

 

Study Notes: gt package and format table

R
A introduction about gt package is here
May 25, 2020
Jihong

 

Some Thoughts After Reading

blog
Last night, I read the 1st chapter of Statistical Rethinking: A Bayesian Course with Examples in R and Stan from Richard McElreath. I found this is nice book to share with my friends. The core idea of that chapter is the relationship between NULL hypothesis and statistical model.…
Nov 21, 2019
Jihong Zhang

 

Use R as a bash language

blog
R language could be easily used as a bash script using Rscript *.R. system() is a R base function which could run command line within R.
Nov 14, 2019
Jihong Zhang

Introduction to Latent Attribute Network Analysis

blog
Network
DCM
Network analysis is a very useful tool.…
Oct 20, 2019
Jihong Zhang

 

SMEP 2019 Poster Session Materials

Poster
See the handout and download the poster here.
Oct 8, 2019
Jihong Zhang

Which Country own the most Liberty Nobel Prizes? France? Ireland?

visualization
blog
ggplot2
It is of my interest to use ggplot package to visualize some fun data. In this post, I tried to play with a Nobel…
May 20, 2019
Jihong Zhang

 

Make a Game in R

blog
Recently I found a interesting R package call nessy which allows you to create a…
Apr 19, 2019
jihong

Introduce gganimate for Psychometric

R
Tutorial
A new R packge (gganimate ) provides some new features for animation in R. Its big advantage is it could make use of ggplot API and embeded into ggplot.…
Feb 22, 2019
Jihong

Lasso Regression Example using glmnet package in R

R
manual
More details please refer to the link below: (https://web.stanford.edu/~hastie/glmnet/glmnet_alpha.html#lin)
Feb 19, 2019
Jihong Zhang

Visuliaztion of Item Information Curves In R

blog
This blog is to show a new way to display item information curves using ggridges pa…
Jan 10, 2019
Jihong

[Manual]Using Jags and R2jags in R

Manual
This post…
Sep 12, 2018
Jihong

 

Introduce Descrepancy Measures

R
This…
Sep 11, 2018
Jihong

 

How to do Data Cleaning in R

blog
R
tidyverse
This…
Sep 4, 2018
Jihong Zhang

 

Updating R Version Without missing packages

blog
After updating to new R version (4.5) from old version, you have to re-install all packages by default. However, there’re some solution for that.
Apr 29, 2018
Jihong Zhang

 

My New Shiny App Cut Score Consistency

R
Shiny
Mar 10, 2018
Jihong Zhang

 

Academic Writing

blog
This post is aimed to remind myself how to write articles with Academic Writing Style. The original article is from http://libguides.usc.edu/writingguide/academicwriting.
Feb 11, 2018
Jihong Zhang

Latent Profile Analysis using MCLUST (in R)

R
clustering
latent class
Hi there! This is Jihong. This is a webpage folked from JOSHUA M. ROSENBERG.…
Nov 23, 2017
Jihong Zhang

Parental Involvement and Children Motivation

blog
One big problem in education study is the longitudinal effect of explanatory factor is always ignored. One of the reasons is the requirements of longitudinal data hardly be…
Nov 22, 2017
Jihong Zhang

 

EFA v.s. CFA

blog
I always found exploratory tools and confirmatory tools have distinct fans. The fans of exploratory tools believe the conclusion…
Nov 20, 2017
Jihong Zhang

One Example of Measurement Invariance

R
SEM
lavaan
Recently, I was asked by my friend why should we use Measurement Invariance in real research. Why not just ignore this complex and tedious process? As far I’m concerned…
Nov 12, 2017
Jihong Zhang

 

Simulation of Lognormal distribution

blog
This post is a try about how yo simulate lognormal distribution in R. Lognormal distribution is used a lot in cumulative data (e.x. counting), which is very similar with…
Nov 11, 2017
Jihong Zhang

Simulation Study of Linking Using Mirt

R
mirt
linking
This simulation study is to show how to do IRT Linking Process using mirt R Package. The simulation data…
Nov 10, 2017
Jihong

How to use lavaan package to perform Confirmatory Factor Analysis

Manual
R
Lavaan
T…
Oct 19, 2017
Jihong

 

Posts

Jan 1, 2015
Jihong Zhang
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