Does anyone know whether we are obliged to use conditional logistic regression for frequency matched controls in a case-control study?

30 November 2012 1 5K Report

I read a STATA blog that suggested not, but I would like some corroboration

It depends. As far I know, you MUST use it if the strata of the individual matching are tiny (less than 20 cases or 20 control). It is the case for a model with a lot of variables. I recommend you to read the chapter 7 of the IARC monography of Breslow & Day on case-control studies.

Badges
Science topic

Similar topics
Publishing

More Darryl P Leong's questions See All

Modelmuse: Modflow 6: Why Wells not showing at correct depths location?

I have imported wells as points and filled in the Data (i.e., X, Y, Z, etc.---using the Well Package) The well locations appear on the Top View, but the depth is not showing up even though...

25 January 2024 9,145 0 View

I have a question about concatenating sequence runs in MEGA X. Can you assist me with this?

I concatenated four sequences. Can I find the best model for the concatenated sequences and then run the maximum likelihood tree with the best model in MEGA X?

14 December 2023 7,498 0 View

What makes 1x SDS running buffer to have low current?

At a fixed voltage of 260V, electrophoresis of protein was faster in our previous batch of 1x SDS running buffer. However, the electrophoresis was much slower recently with much lower current...

07 December 2023 1,326 3 View

What could cause E. coli cell death despite antibiotics addition to favour the recombinant strain?

It was a large scale culture of a single strain. Only 1 of the flasks showed cell death while others just grew fine. What could cause contamination that contribute to cell death, given that the...

28 November 2023 1,949 1 View

How to solve error running Abaqus with multicore on AMD system?

Hi, I have two computers, one with an AMD processor (Ryzen 5600x) and the other with an Intel processor (i7-12700), both running Abaqus 6.14-2. While multi-core functionality works smoothly on...

05 October 2023 923 0 View

How to resolve errors simulating geomechanical models using Mohr-Coulomb with a Tension Cut-Off of zero in Abaqus?

I am modelling an underground cavern for Compressed Air Energy Storage applications using Abaqus. To begin, I attempted to replicate the results presented in the provided paper: Damasceno, DR,...

05 October 2023 8,753 0 View

Materials Scientists and Polymer Chemists, what methods are used to extract a polymer that is in a solvent from the solution?

I have an in-solution polymer that I want to extract from a high boiling point solvent. I've tried to crash it out by putting it in the refrigerator, and by adding a non-polar solvent. But I...

16 May 2023 5,926 3 View

Are there more living things in metropolitan areas than in rural areas?

The question begs delineation of prevailing connotations in re living as well as metropolitan and rural. One's answer relies on how one justifies the existence of each variable.

12 May 2023 9,502 0 View

How to view SwissDock result locally on PC?

What to do if ChimeraX software doesn't recognise the .chimerax file downloaded from SwissDock after docking? Besides, the zip file of prediction done was empty. Thank you.

18 March 2023 5,104 3 View

How to reduce/ completely get rid of clumps before seeding/subculture mammalian cell line?

I am dealing with human epithelial cancer lines cultured in T-75 flasks. After trypsinisation, trypsin inactivation and centrifugation, the cell pellets collected were resuspended 30-40 times with...

03 March 2023 5,763 8 View

How can I prepare virus for a TEM or SEM imaging?

I have virus (viral hemorrhagic septicemia virus) in suspension and the experiment will not involve cells. What level of TCID50 is preferred?

11 August 2024 3,115 1 View

Handling Missing Data and Building a Predictive Model with Incomplete Information ?

I am developing a predictive model for a water supply network that involves 20 influencing points. However, I only have historical data for 10 out of these 20 points. I would like to know how to...

10 August 2024 4,005 2 View

Is it possible to use the Fused Deposition Modeling (FDM) to additively manufacture interconnected porous structure generation of >100-200 micrometer?

Usually, additive manufacturing techniques like SEBM, SLS, and SLM are used for interconnected porous lattice structure generation with sizes of >100–200 micrometers. Can the Fused Deposition...

09 August 2024 7,892 0 View

How to define an anisotropic material with asymmetric elastic compliance/stiffness matrix in ANSYS APDL?

I need to model an anisotropic material in which the Poisson's ratio ν_12 ≠ ν_21 and so on. Therefore, the elastic compliance matrix wouldn't be a symmetric one. In ANSYS APDL, for TB,ANEL...

09 August 2024 5,048 2 View

How can I apply boundary conditions in an orthotropic steel deck numerical model using ABAQUS software?

I am trying to simulate vehicular loading on an orthotopic steel deck bridge section in ABAQUS software. The red arrow mark in the attached figure indicates the direction in which the vehicle will...

08 August 2024 719 0 View

Can you suggest reliable sources defining "3D mesh" and "3D city models"?

Dear fellow researchers, I am currently working on a paper where I need to provide a reliable reference that defines and distinguishes between 3D mesh models and 3D city models. Although I am...

06 August 2024 9,986 2 View

Is there an alternative to a multinomial regression which allows the DV to be non mutually exclusive?

I am trying to analyse data from a survey examining what variables affect teachers perceived barriers to incorporating technology into their classroom. I have 5 predictor variables however my DV...

06 August 2024 1,752 3 View

Are there any instruments for studying time similar to the way it is in space?

There are a huge number of methods for studying objects in space, according to the senses (and not only). Mechanical, thermal, optical, acoustic, electrical, magnetic, based on particle beams,...

06 August 2024 7,102 0 View

In order to run Multinomial Logistic Regression, is it required that the data be in the long format?

I am using unit level data (IHDS round 2) & Stata 17

06 August 2024 5,725 2 View

Are there any good simple systems or platforms to recommend?

In order to show people the beauty of control and enhance enthusiasm for learning control theories, are there any good simple systems or platforms to recommend?

05 August 2024 10,034 1 View