In psychometrics, what are some quant. methods to examine several competing operationalizations of the same construct to see which is most 'valid'?

13 January 2021 2,740 3 View

How to calculate age-standardized prevalence ratio with 95%CI?

I need to calculate the prevalence ratios to show the trend of prevalence of a drug group used by pregnant women over the years (2001-2018). I would like to use the year 2001 with age distribution...

05 January 2021 7,986 5 View

Does CD31 indicate cell viability?

Hi, I am wondering if the immunofluorescent staining of CD31 antibodies can both mark endothelial cells and indicating their viability. In other words, if I perform immunofluorescent staining for...

23 December 2020 5,815 4 View

How to increase titer of Herpesvirus, Adenovirus?

I'm working with Herpesvirus and Adenovirus. For Herpesvirus, I use Vero cell line to activate and check virus titer. For Adenovirus, I use Hela cell line. Recently, I could activate them, but...

16 December 2020 4,073 5 View

How big can a enhancer deletion be ? how can we obtain homologous deletion clone ?

Hi all, I have tried to use Crispr Cas9 ( plasmid px333_cas9_mCherry) to delete some enhancers. I designed sgRNA using Chopchop website to target both sides of an enhancer to induce homologous...

13 December 2020 942 3 View

How to calculate the fractional vegetation cover (FVC) from Landsat imagery?

Hi folks, I wonder if anyone know how to calculate the fractional vegetation cover (FVC) from Landsat imagery? As far as I have read about that NDVI, NDVIs, and NDVIv are three required input...

07 December 2020 4,054 2 View

Is it possible to identify/classify rubber using satellite imagery with machine learning?

As of now, I am trying to explore the potential of using high/very high-resolution satellite imagery with machine learning (ML) to identify or map forest cover (e.g. rubber). As a newbie in this...

17 November 2020 7,187 3 View

Cloudy brain samples in sucrose solution?

I have some samples I left in sucrose for a couple of weeks after perfusion and was wondering if these samples are still salvageable? I perfused the brain, then they were fixed in 4% pfa for 24...

15 November 2020 1,728 2 View

How can percentage change over time be assessed/analyzed with multiple time points without the sample size (or any other info.) at each time point?

Hi there, Please see the attached table for context. Please note that each year they were sampling new freshmen (i.e., not within-subjects longitudinal design). So, the authors of a book I read...

14 October 2020 6,530 3 View

CDNA PCR problems: why did the sample without reverse transcriptase enzyme (band 5 in both two genes) have strong band with gen A?

Dear all, These are data from gel base of cDNA sample for PCR with protocol attached on the figure. Band 5 is no reverse transcriptase enzyme during doing cDNA library used random primer. With gen...

04 October 2020 8,774 4 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

What SPSS analysis should I run with one IV (with two levels) and two DVs?

Hi, I am trying to figure out which test would be most appropriate to run for the following question: Is there a difference in task blood pressure between smokers and non-smokers? There are two...

01 March 2021 8,235 2 View

Statistics: include groups of respondents made by one person for analysis?

Good morning, I could not find literature about this so I am asking. I am organizing data for a questionnaire (N=100) that foresees some personal questions like level of education. For the aim...

25 February 2021 2,090 4 View

How to identify what type of fillers are in a polymer?

Hello everyone, I have some PHAs blended with fillers and nucleating agents, yet I don't know what kind of fillers or nucleating agents. The producer has shut down and there's no way to get in...

24 February 2021 1,356 8 View

Sample size determination for non-parametric tests?

How do I run a a priori sample size determination for non-parametric tests, like the Mann-Whitney U-test and the Kruskall-Wallis or other non-parametric tests that accord with the unpaired t-test...

24 February 2021 166 6 View

How to formulate Energy minimization in Molecular dynamics simulation for alloys using meam potential?

during MD simulation, the atoms are not moving as per required. The problem (as per my observation) lies in energy minimization technique. upon application of tensile strain in x or y direction,...

22 February 2021 380 5 View

Statistical Tests for Quantitative Study?

Hello Everyone, I have one population, sample size 200. and needed to find the correlation between Variable A and B. Also, which T-test should I choose for hypothesis testing Please advise...

21 February 2021 7,591 4 View

How to model rupture in geogrid in abaqus?

Hi researchers I wanna model tensile test on geogrid in abaqus, so I added displacement to one side of geogrid and the other side of geogrid is constrained completely, everything seems normal but...

19 February 2021 2,195 2 View

How to compare means of continuous data with zero-inflation and skew?

I have two groups (unpaired) of plant biomass measurements and want to know whether there is a test that can be used to determine statistical significance where assumptions are not violated. The...

18 February 2021 1,258 4 View

How to report Fishers Exact test from SPSS in a report properly?

I am wondering how do I write the data I have collected from my fishers exact test into words so that it backs up my work? the exact sig.(2-sided) was 0.033, meaning it is significant because its...

17 February 2021 3,441 7 View