How to treat Time varying covariates in HLM analysis?

Hello, i'm currently running an analysis of longitudinal data. i'm using HLM analysis using the SAS software. the design is as follow: IV1 - time (3 time points: before\during\after stress) -...

28 November 2019 7,212 2 View

How to apply fuzzy K-means with spatial constraints in R?

Hello. I am looking for a solution in R to apply spatially-constrained clustering using fuzzy K-means (fuzzy c-means). I came across the spatialClust package, and was wondering whether anyone may...

30 October 2019 4,701 2 View

Methods for measuring N-mineralization in field sites/experiments?

A student is installing a field trial that we expect to largely impact soil moisture and temperature, and we simultaneously want to measure the secondary impacts on N-mineralization in the field....

26 March 2019 4,138 3 View

What to do if the assumption of Homogeneity of variance has been violated - Three-way anova?

i have a 3-way mixed anova design: 2 IVs that are within-subject and 1 IV's that is a between-subject variable. the assumption of equality of variance (Leven's Test) was violated, as the test came...

18 August 2017 3,240 4 View

Could I have a 50-75bp band for primer dimers, even if my primers are around 20 bp long?

Hi I have problems with my PCR negative controls, Sometimes I see a band in the gel electrophoresis in these controls (same master mix that in samples but without DNA template). The band is...

14 June 2017 4,540 3 View

What is a good plant analytical laboratory to farm out analyses to?

11 May 2016 7,904 5 View

How different do languages need to be before they are considered separate? What is the "taxonomy" of languages?

I have zero experience in the field of linguistics, but a paper I am writing now calls for a brief paragraph about using languages as one defining characteristic of a different cultural group....

26 April 2014 1,240 13 View

Do you know any examples of indigenous language having a concept for "wilderness?"

Many of the thousands of indigenous languages in the world do not have a word for "wild" or any of its relatives -- wildness, wilderness, wilding, etc. -- in their vocabulary. Do you know any...

26 April 2014 7,411 20 View

Anyone interested in collaborating on a meta review of organic cropping systems?

I've been interested in bringing together any science that has been done on organic cropping systems. This would hopefully result in an understanding of overall biogeochemical cycling impacts of...

12 June 2013 2,621 6 View

Connectivity networks during task - FMRI question

hello! I hope that this will be clear. i am in the beggining of a project. i have data of 100 participants that preformed a task with two conditions in a fmri scanner. i'm intereseted in...

01 January 1970 9,020 2 View

Matlab: train random forest with time series? How to transform time series data to a supervised learning dataset?

Hey, I've build random forest using Matlab Machine-Learning Toolbox Function (treeBagger). I've computed several kinematic features like velocity or acceleration as predictors (24 predictors) for...

22 December 2020 2,638 3 View

How we analyse the audio based interview data using R software?

I conducted a qualitative research and recorded the interview as audio clips for each respondent. How we analyse the audio based data using R software? This is quite common in NVIVO and Atlas.ti....

02 June 2020 9,944 6 View

How to avoid the interference signals arising because of the wires in Digital oscilloscope?

I am trying to make pressure/force sensors and measuring the corresponding signals on digital oscilloscope (DSO). But most of the time observing the interfering signals because of the wires/clips...

27 November 2019 3,169 5 View

Can you recommend a lab in the US that can sequence the mitochondrial cytochrome b gene for shrews?

I am completing my Master's in Biology on small mammal research (Sorex shrews) in Washington State. I am looking for a reliable lab in the US to send tail clips/liver samples to, to sequence the...

09 October 2019 239 2 View

N-evaporator setup?

I need to construct a N-evaporator setup for drying small volume of samples (0,5 ml and less) however need details about tubings used in the system. It is a basic system connecting a N-tank...

02 March 2019 3,067 4 View

Do migrating Filshie clips contribute to pelvic pain, neuropathy, and GI concerns?

Do migrating Filshie clips contributed to pelvic pain, neuropathy, and GI concerns? Please review diagnostic images uploaded for this research project: Filshie Clip Migration: Cause and Effect

01 February 2019 6,311 2 View

What statistical analysis do I need to use with three levels of an independent variable and one dependent variable?

31 December 2018 5,445 3 View

Apps for offline data collection with iPad?

Hi everybody, Our research team is going to conduct a longitudinal study in German secondary schools and we will collect the data with our own iPads. We are looking for a survey app which allows...

11 December 2018 422 1 View

Can reinforcing steel be tack welded as an alternative to using wire ties or plastic-type clips?

Its a technical question..

10 November 2018 1,738 30 View

How can I culture primary fibroblasts from a mouse without euthanizing it?

My lab has some mice that we cannot afford to euthanize. We would like to use ear punch biopsies and tail clips for fibroblasts, but I am not sure if there will be enough cells in each to set up a...

10 November 2018 4,467 3 View