How to interpret hierarchical regression when a predictor is no longer significant after new variables are added?

Hello everyone: What does it mean when a variable is significant in one step but then in the next step it's no longer significant? For example, in this article...

29 November 2020 7,354 3 View

UV-Vis of Toluene. Having absorption values after doing a blank with the same compound?

I am preparing a solution of 0.02 mmol of compound A in 2ml of acetonitrile or toluene. The solution of compound A in acetonitrile is then measured by UV-Vis (600 to 190 nm range) using a high...

20 November 2019 6,137 2 View

Does anyone know of a cell line (from C57BL/6 mice) that can induce lymphomas (preferentially NHL) when introduced in SCID mice?

Similar to BJAB (human) or A20 (balb/c) but a C57Bl/6 one

07 May 2018 3,920 2 View

What solvent can I use to dissolve an organic-inorganic hybrid to perform liquid 31P-NMR?

01 May 2018 3,659 4 View

Building a Knowledge Graph on Renewable Energy Sources?

Hello everyone: Many countries around the world are looking for updated and integrated data and information related to Renewable Energy Sources for solving practical problems in this area. The...

01 February 2018 5,152 4 View

Is there a way to decouple the effects of melanin, or another featureless aborber, from scatter in the visible region?

Our group does a lot of work with probe and wide-field quantification algorithms for neurosurgical guidance. In brief, we have found that our reflectance analysis models are failing to decouple...

28 February 2017 1,172 7 View

Could burned land be recovered?

The bioremediation is used for recovery contaminated lands, but is possible recover a land burned?Bacterias that use carbonized matter? Maybe is a crazy idea...

06 February 2017 9,574 5 View

[SOLVED] How can I solve the "Cannot read FoldX RepairPDB output" error in Yasara/FoldX?

I am trying to model point mutations in protein structures in Yasara using the FoldX plugin but I always get the same error: "Cannot read FoldX RepairPDB output". This is apparently a known error...

06 July 2016 7,121 2 View

[SOLVED] How can I solve the "Cannot read FoldX RepairPDB output" error in Yasara/FoldX?

I am trying to model point mutations in protein structures in Yasara using the FoldX plugin but I always get the same error: "Cannot read FoldX RepairPDB output". This is apparently a known error...

05 July 2016 7,716 2 View

Can you re-use the Nalgene Disposable Filterware (115 mL)?

I ran out of 50-ml conical filter bottles. I have these 115 ml disposable filters, but I feel like it is such a waste throwing it away after a single use. It comes with a cover and, if kept in the...

18 November 2015 2,617 2 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

Guidelines for survey (question type) analysis?

Hi. Please tell me what guidelines should i need to follow for questionaries' type research work in India. It is not hospital based work, we are conduction basic institutional based qualitative...

03 March 2021 2,037 3 View

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

I am on the lookout for the Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence. Does anyone know where I can find it? Thank you in advance

03 March 2021 3,568 1 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

Do we need to write protocol for a second study of a systematic review that has been registered and published?

I have conducted and published a systematic review and meta-analysis research with the topic related to public health and health pomotion (protocol was registed in PROSPERO). Now we want to...

03 March 2021 8,920 3 View

How to increase a model accuracy ?

dear community, my model is based feature extraction from non stationary signals using discrete Wavelet Transform and then using statistical features then machine learning classifiers in order to...

03 March 2021 6,994 5 View

1. What is the impact of having different scales in a survey? and how can we solve this problem before and after data collection (Literature)?

1. What is the impact of having different scales in a survey? and how can we solve this problem before and after data collection (Literature-based reflection)? Thank you for your time and for...

03 March 2021 2,870 3 View

What degree of missing data in a particular case/participant results in Expectation-Maximisation no longer working?

I'm dealing with a mediation model and am using the PROCESS module in SPSS. Due to SPSS and PROCESS being limited in the imputation methods - being unable to handle multiple imputation - the other...

02 March 2021 4,362 1 View

Do I need to do linear regression before running mediation analysis using PROCESS MACRO by Hayes ?

I just wanted to check if I need to run a linear regression separately if I am using PROCESS MACRO to run mediation analysis. Thank you.

02 March 2021 4,359 3 View