It’s all About me.

I am **Muhammad Imdad Ullah**. I earned my Ph.D. in 2017 from Bahauddin Zakariya University Multan, Pakistan in Statistics. The main concentration of my work in my Ph.D. was detection and collinearity and its remedy using some biased regression techniques such as ridge regression and Liu regression. I proposed two collinearity diagnostics in my Ph.D. work and developed three R packages available on CRAN. The packages are mctest, lmridge, and liureg. I also have three publications related to these packages in The R Journal.

I am the Admin and Author of three statistics-related websites (i) itfeature.com, (ii) rfaqs.com, and (iii) gmstat.com.

I taught applied Statistics and Mathematics as a visiting lecturer in different departments of the University. I am currently working as an Assistant Professor in the Department of Statistics at Ghazi University, Dera Ghazi Khan.

The following subjects are taught by me.

- Statistical Packages (SPSS and Minitab)
- Design of experiment (Practical)
- Business Statistics (I & II)
- Business Mathematics
- Business Mathematics and Statistics
- Probability and Probability distributions (Practical)
- Advanced Statistics (Sociology, Psychology)
- Quantitative Methods Using SPSS
- Quantitative Techniques

**Publications** (About Me)

- Hayat, H., Akbar, A., Ahmad, T., Bhatti S.H., and Ullah, M.I. (2021). Robustness to missing observation and optimalities of response surface designs with regular and complex structure,
*Communications in Statistics-Simulation and Computation, 1-18.*https://doi.org/10.1080/03610918.2021.1977954 **Imdad, M. U.**, Aslam, M., and Altaf, S. (2018). lmridge: A comprehensive R Package for Ridge Regression.*The R Journal*, 10(2), 326-346.**Imdadullah, M.**, Aslam, M., and Altaf, S. (2017).*liureg*: A Comprehensive R Package for the Liu Estimation of Linear Regression Model with Collinear Regressors.*The R Journal*, 9(2), 232-247.**Imdadullah, M.**, Aslam, M., and Altaf, S. (2016).*mctest*: An R Package for Detection of collinearity among regressors.*The R Journal*, 8(2), 499-509.- Qureshi, S.U., Ashfaq, J., Hassan, M.U,
**Imdadullah, M**. (2015). Impact of Extroversion and Narcissism on in Role and Extra Role Performance: Moderating Role of Impression Management Motives, Pakistan Journal of Commerce and Social Sciences, Vol. 9, pp. 96-119. - Qureshi M.A., Ali Abdullah and
**Imdadullah M.**(2012). Stock Prices’ Variability around Earnings Announcement Dates at Karachi Stock Exchange, Hindawi Publishing Corporation, Economics Research International, Vol. 2012. - Qureshi M.A.,
**Imdadullah M.**and Tanveer A. (2012). What determines leverage in Pakistan? A panel data analysis. African Journal of Business Management. Vol. 6(3), pp. 978-985. - Qureshi M.A., Waqas A. and
**Imdadullah M.**(2012). Does Diversification Affect Capital Structure and Profitability in Pakistan? Asian Social Journal, Vol. 8, No. 4. - Numan A., Ali M., Imran S.C. and
**Imdadullah M.**(2011). A Study on Student Satisfaction in Pakistani Universities: The Case of Bahauddin Zakariya University, Pakistan. Asian Social Journal, Vol.7, No. 7, pp 209-219. - Aman Ullah M.,
**Imdadullah M.**(2011). Impact Analysis for Regression Models with Heteroscedastic Errors. Pakistan Journal of Social Sciences. Vol. 31, No. 2, pp. 379-394. - Atif A.,
**Imdadullah M.**, Aman Ullah M. and Aslam M. (2011). Determinants of Economic Growth in Asian Countries: A Panel Data Perspective. Pakistan Journal of Social Sciences. Vol. 31, No. 1, pp. 145-157.

** Conference Papers:**

- Qureshi, M. A.,
**Imdadullah, M.**, & Ramzan, M. (2011). Impact of Ownership on Performance and Capital Structure Decisions.*LUISS Guido Carli University, Rome, Italy.*

**Book:**

- Aslam, M., and
**Imdad Ullah, M.**(2023). Practicing R for Statistical Computing. Springer Nature. - Hina A. H., Maryam H.,
**Imdadullah M.**and Malhotra M. (2012).*Role of Hopelessness and Meaning in Life among Adults.*Createspace Independent Publishing platform. ISBN 978-1479187287.

aoa sir,

I’m working in r software.I want to write the percentages inside the pie chart’s slices, how to write it.Plz sir reply me

You have to use ggplot2 package. An example related to your requirement is:

`region< -c("US","Europe","Japan","China","Others") sales<-c(25000,12000 ,10000,5000,2000) region_sales<-data.frame(region,sales) ggplot(transform(transform(region_sales, sales=sales/sum(sales)), labPos=cumsum(sales)-sales/2), aes(x="", y = sales, fill = region)) + geom_bar(width = 1, stat = "identity") + scale_fill_manual(values = c("red", "yellow","blue", "green", "cyan")) + coord_polar(theta = "y") + labs(title = "Percentage Sales per Region") + geom_text(aes(y=labPos, label=scales::percent(sales)))`

great work sir

Assalamo alaikum sir your website is very helpful but kindly makes some quality videos also and upload them to you tube so that we would learn every topic in depth it will be very beneficial for us. Its my humble request to you please share your worthy knowledge with all of us.

thank you

Walaikum us Salam!

Many of the things have to be done, but I have no resources. I have to do myself all of the work on the site.

Good job done by you all data easy available this site . plz give me some advice for my statistical Exam .

Thank you. Keep visiting the site.

sir i need stat mcq in pdf form…

Dear Zubair!

I don’t have MCQs in pdf form. However, you can test yourself on the website for online MCQs quizzes.

A.o.a

Sir ………..you have done a good job.

Kindely

Can you help me in statistics.

And if you wrote any sort of notes

On statistics for intermediate.

Plz tell me .

I am waiting for your reply.

I try to post any kind of notes on itfeature.com, gmstat.com or rfaqs.com

Hi Sir..

Can you help how to fix the heteroskedasticity in my papers. I alrdy tried the transformations data & othr remedy but the heteroskedasticity is still present..

I had use the command in stata like prais yvar xvar1…., corc or vce(robust)..stil the durbin watson test result is very slow–heretoskedasticity is present..

Can you give any suggestions for my papers please..

It will be appreciated. Please do response. Thank u

please share what you have done. You can send data and information on my email.

Awesome work and platform for the students of statistics and mathematics. Great job sir.

Thanks

Essalamo Alaykom. Hello,

Please, what is the estimation method, when grouped observations in a regression model?for example the data in deciles (10 observations).

massami99@yahoo.fr

thnx for this usefull materials gd work……

AoA … Please upload some material about T Distribution … and also Differece between about T , F , and Normal Dist MAterial

nice work sir

That’s an astute answer to a tricky quseoitn

nice work sir g……

Sir …. great work ðŸ™‚

It will be more beneficial if you give give explanation of the answers along with answer key. still good job and useful for a medico.

For what answers and explanations do you need.