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Questions related to Statistics
I planned several ANCOVA analyses with 8 covariates to be included in each one. However, the homogeneity of regression slopes assumption was violated for some covariates but not others. E.g. for...
03 October 2020 6,081 7 View
I am using survival analysis for repeated events and I want to see if the effect of the time-dependent covariate differs by group.
03 October 2020 792 3 View
I have a unidimensional marital satisfaction scale (Johnson, Zabriskie, & Hill, 2006) with five items. My sample was 194 married individuals, and using the data from my sample, I wanted to...
30 September 2020 6,731 3 View
Hello to every one, Let's assume I've measured something on 3 different subjects once every month. I can calculate the standard deviation and report it on each date of measurement (please find...
30 September 2020 819 4 View
Hello everyone, I've been struggling with this matter: We have data on sugar cane production (soils, treatments, weather …). We want to understand in which conditions soil/plant nutrition will...
25 September 2020 3,072 5 View
Let's say my predictor values are: husbands' anxiety, wives' anxiety, husbands' satisfaction, and wives' satisfaction. I am conducting SEM. I am grand mean centering my predictors because it was...
16 September 2020 1,718 3 View
I am completing a Bayesian Linear Regression in JASP in which I am trying to see whether two key variables (IVs) predict mean accuracy on a task (DV). When I complete the analysis, for Variable...
11 September 2020 6,071 3 View
Hello, I have measured morphometric parameters of plants grown in vitro (height, root mass, etc.). I have one variable, thus two test groups - control and treatment group. I've made three...
10 September 2020 7,572 5 View
We know that the estimation error (in percent) can be calculated with EEx = a*sqrt(var(x))*100/x, where EEx is the estimation error, a is a constant, var(x) is the variance (came from...
07 September 2020 1,761 4 View
Hi there, I'm working on a systematic review but am not very proficient with stats - I have the baseline and final mean results for my control and intervention group as well as their standard...
28 August 2020 6,736 4 View
I have read a recent article titled "Characterizing extreme rainfalls and constructing confidence intervals for IDF curves using Scaling-GEV distribution model'. I am having some difficulties in...
25 August 2020 5,539 5 View
Hi, I am using STATA to do propensity score matching on a large sample (n around 1000 or more). Only way I know is the psmatch2 command, generate 1:1 matched pairs and identify them and run a...
17 August 2020 3,308 4 View
In my recent study I had one independent variable (IV, 2 levels) and a number of different explanatory variables and one response. The aim was to assess the relationship between teamwork...
14 August 2020 4,262 6 View
Hi all, Just a quick question. 2 of my groups when compared do not demonstrate normal distrubution (ND), so in order to compare group differences I chose a sign test (previously failed...
13 August 2020 8,531 4 View
Is there an alternative interpretation to boxplots for Wilcoxon Sign Test? I compared two variables for repeated measures (say x and y-likert scale 1-7) in Wilcoxon Sign. The boxplot, medians and...
12 August 2020 3,206 2 View
Hello to all of you, I want to make an intervention at work, and I wish to measure the effects of such intervention. I intend to introduce a new goal management process: I would like to analyze...
09 August 2020 2,963 6 View
I am working on an experiment where I will be growing soybean in pots through all its stages in a greenhouse, I have a total of 65 plants in the beginning with 4 treatments and 1 control group...
07 August 2020 9,943 3 View
It's been recommended that I randomise samples across a 96 well plate, but not true randomisation, just don't run duplicate samples next to one another. Can someone point me in the direction of...
06 August 2020 7,606 3 View
I have obtained two ratings (creativity and technicality) from six expert judges based on art-related outcomes. I am following Amabile's (1979) Consensual assessment technique to identify assess...
03 August 2020 7,710 3 View
Dear all I would like to express how able is a certain testing method to differentiate a certain parameter for my samples. I was thinking to use the variance since we can have an estimation on...
31 July 2020 9,048 19 View
Machine learning model, normally, is applied on new data for testing. If the accuracy of the model is below a certain threshold, the model is rejected. But why? This is just a random sample, the...
26 July 2020 8,717 4 View
Hi, I have used the package pwr in R, but it falls short when compared with the GUI program G*Power (https://gpower.hhu.de/). G*Power has a wealth of options and analyses but pwr is more...
23 July 2020 3,882 3 View
I have a data set that has 3 groups and a single variable. Under normal circumstances, a one-way ANOVA would be used for comparisons between my three groups. HOWEVER I ran a Shapiro-Wilk test for...
23 July 2020 6,233 7 View
I'm doing a project, where I scan over a sample recording a spectrum at each position. Although the sample is supposed uniform, there's a large difference in the overall spectral response of each...
14 July 2020 2,148 3 View