analysis

Hi, I'm a student of statistics and right now, in my course, we're studying validation of diagnostic tests. While learning about ROC Curves and AUC, I was wondering if does considering ROC Curves in the multivariate context make sense, and if so, how's the analysis performed and which are the...

Hello all! I am in the beginning of a statistics project in my master's course which will be focusing on regression analysis later on. We have not yet done any regression analysis but have been asked to turn in a paper on initial findings and analysis, but I am having a lot of trouble in how I...

Hey All, I have information on a multiple YouTube channels. The information collected for each users channel is: channel name | the date/day | the number of subscriber on the day | number of videos on the day | a yes/no variable for if they have a video trending on that day. I want to see...

Hi! I'm new here and I need help with this: The data: I have 1000+ subjects each one scanned with a MR 3 times (with different sequence T1, T2 and IR). Each scan yields (after a segmentation) to the 15 volumes of the brain region in study (the brain region has 15 "sections" which volumes' are...

Currently collecting employment/working satisfaction data from survey at different countries. Same set of questions is used. I have come across that people from some countries tend to be more optimistic/pessimistic than others. How can I take their answering behaviour into consideration when...

Let me start by saying I don't have much of a background in statistics, but I am attempting to inject some statistical analysis into a relatively straightforward pricing model that I use to price rental units. I'm just looking for a place to start, so any help would be appreciated. I apologize...

A classifier is expected to face with many datasets with different characteristics such as being unbalanced. Besides, their missions are different, for example, categorizing data into just two classes or more than two. There are many different parameters for evaluating the performance of a...

Dear all, For my Master’s thesis, I have some difficulties with the statistical part of my research. I want to analyze the relationship between two variables: Investment in Innovation (R&D) --> Concentration Ratio 1. Research & Development (R&D) Investments in an industry 2. Concentration...

Hello I am currently applying for research ethics for a project however i cannot get my head around the correct statistical analysis for my project The problem i am trying to answer is that there are several reference values to score a participants breathing test score against. I am...

I am testing the hypothesised effect in a model using SEM A -> B between two groups. The results of the standardised path coefficients (SPC) are Group 1: spc = 0.334 p < 0.001; Group 2: spc = 0.316 p = 0.181. I would have expected the effect of group 2 to be also significant although it is...

Hi everyone, Really needing help with choosing the right analysis for my variables. Background: I'm looking at the difference in amplitude for reaction times of negative, positive, and neutral words. The IV: reaction times (negative, positive, neutral words) The DV: amplitude...

Hi all, I'm new to regressions and also new to posting here. My topic is: How have E-books Affected College Textbook Prices? My hypothesis is: H0: The CPI for college textbooks will fall with the introduction of the e-book because increased innovation and competition causes an...

Dear all I just received all questionnaire responses but I am not sure which test is the best for analyzing the data. The questionnaires were distributed to two groups, one is for successful candidates; another one is for the unsuccessful candidates. Most of the data is nominal, and my...

Hi - I have two populations / groups that I need to compare on one variable. Now usually I would use a t-test or anova but ive been told that these are unable to be used with survey data in stata. Is this correct advice - can I not use a t-test or anova in stata with survey data? And would a...

I have a large dataset (n=11804) that includes data from a cross sectional study conducted in 2013, 2014 and 2015 in patients in nursing homes...so its 'repeated cross sectional', right? However, some patients participated more than once, so in 2013 and 2014 or 2014 and 2015 or all 3 years...but...

The list of items that comprise the universe selected for analysis and is used in determining which items will be selected is called ________

Hi everybody I was wondering if anyone here had any expertise regarding analysis of crossover trials. I'm writing my thesis at the moment and was reading through an article that is considered central to my field. It's a cross-over clinical trial with one placebo and one active treatment...

My friend and I analyzed the same data but came up with two different sets of results :shakehead . I'd like help to understand why. Situation: We each used the same data, which came from a questionnaire of 100 items, each positively worded (e.g., "This is a great place to work"). The 5...

Hi, What is the non parametric alternative for parametric ANCOVA if we find that some ANCOVA assumptions are not met? How it can be done in SAS?

Hi there, I'm new to the site, this is my first post! I've run a discriminant function analysis by entering syntax into SPSS. My data consists of sets of fish separated by species, and each species group has individuals ranging from 4 to 53 specimens. I have my output which is showing me...