Python stepwise regression with AIC?

Chenying Gao @Chenying_Gao

03 March 2018 1 578 Report

Hi, what is the Python equivalent for R step() function of stepwise regression with AIC as criteria?

Is there an existing function in statsmodels.api?

David Eugene Booth

Forget stepwise, it is unstable. For a better solution see the attached. Best, D. Booth

Badges
Science topic

More Chenying Gao's questions See All

How to set up LSTM for Time Series Forecasting?

Hi All, My question is about modeling time series using LSTM (Long-Short-Term-Memory). I have 18 response variables for which all of them are monthly time series for about 15 years, and I would...

06 July 2018 6,901 1 View

How to add predictors to LSTM time series model?

Hi All, I'm doing Long-Short-Term-Memory (LSTM) to forecast time series. I was wondering, could we add x-reg part to an LSTM model? Like adding an X-Reg part to and ARIMA model? Say I have a...

06 July 2018 4,984 0 View

R String, return a boolean vector of if or not the character is alphabetic?

Hi All, I was wondering if there is a way I can do something like this: str = "3 .*MTNs2 AB33" This is a string of 14 characters I would like to have R return a vector of length 14, and true...

05 June 2018 6,291 1 View

R fitting arima, Error in optim, non-finite value supplied by optim?

Hi All, I'm fitting an arima with xreg: arima(temp_ts, order = c(1,1,1), seasonal = list(order = c(0,1,0), period = 12), xreg = temp_xreg, method="CSS") and it reported error: Error in...

03 April 2018 7,533 2 View

R Factor Analysis with huge amount of predictors resulting in system is computationally singular?

Hi All, I was trying to run Factor analysis for a dataset with around 150 variables but only have around 80 observations. I tried the "factanal" function in R and R reported error: Error in...

02 March 2018 4,325 3 View

PySpark Error on Jupyter Notebook (Py4JJavaError)?

This is a question regarding PySpark Error on Jupyter Notebook (Py4JJavaError) I'm running the demo code from https://spark.apache.org/docs/2.2.0/mllib-linear-methods.html regarding Linear least...

01 February 2018 8,520 0 View

R Logistic Regression Coef sensitive to epsilon = 1e-8. Coefficient not converge?

I'm running a logistic regression with about 200k observations, in which there is one binary predictor where out of the 200k observations there is only 4 occurrence of "1". And the coefficient I...

10 November 2017 2,892 2 View

Logistic Regression detecting over-dispersion and the impact?

Hi All, I'm fitting a logistic regression and I summed up the deviance and used a chi-square distribution to test over-dispersion with this code below: 2 Questions: Q1: I'm getting a p-value

10 November 2017 5,347 2 View

How to test "constant" over time?

How to test a Time Series to be "Constant" over time? I can think of: 1. No Trend (use linear regression and kernel regression) 2. No Seasonality (? Spectrum analysis with T = 2*pi /...

01 February 2017 2,349 7 View

What is the Fastest Neural Network Command in R?

Dear All, I'm running Neural Network on a data frame with 40,000 observations, 7500 predictors and with one response variables. The response variable is a categorical variable with 4 levels. I've...

05 June 2016 5,904 3 View

How to learn more about SPSS and its Application?

I would like to learn more about SPSS and Its application especially in regards to data analysis. Please suggest me how I can learn more about it. Thank you so much.

11 August 2024 9,101 4 View

Can I base on reverse DNA sequences to perform alignment, convert to amino acids and GenBank submission?

I have reverse sequences (AB1 format), can I base on reverse DNA sequences to perform nucleotide alignment, convert nucleotides to amino acids and deposit the sequence in GenBank database?

11 August 2024 5,138 1 View

Baseline drift in HPLC? What causes this?

Hello, Why do i see this baseline drift when i compare my blank (black) to the sample (blue)? Any suggestions as to why this happened? Thank you!

11 August 2024 3,770 4 View

Text-Communication from the M1 Hand Area using BCI—and then there is Elon Musk?

Willett, Shenoy et al. (2021) have developed a brain computer interface (BCI) that used neural signal collected from the hand area of the motor cortex (area M1) of a paralyzed patient. The...

10 August 2024 7,180 0 View

Has anyone applied Python in the field of textile engineering for data analysis, automation, or smart textiles?

I'm currently exploring the application of Python in textile engineering, specifically in areas like data analysis, process automation, and the development of smart textiles. I'm interested in...

10 August 2024 7,429 2 View

How can I use the cif data obtained from rietveld refinement extracted via gsas2, for microstructural analysis using ETEX software?

09 August 2024 7,718 0 View

Request Python code?

Request Python code from this article : Gender equity of authorship in pulmonary medicine over the past decade. THANKS!

08 August 2024 6,242 2 View

How are iso-frequency contours plotted?

Let's say we have a standard, regular hexagonal honeycomb with a 3-arm primitive unit cell (something like the figure attached; the figure is only representative and not drawn to scale). The...

07 August 2024 1,937 1 View

Why does everyone use vs code?

Visual Studio Code (VS Code) has become a popular choice among developers for several reasons: 1. **Free and Open Source**: VS Code is free to use and open source, making it accessible to...

07 August 2024 7,013 4 View

How to prepare the nanoparticle treated fungal sample for Environmental SEM analysis?

A fungal strain was treated with nanoparticles. We want to do an environmental SEM analysis. So could anyone share your views on preparing the sample? Thank you.

07 August 2024 5,307 1 View