statistics

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    Data Science Consulting Jobs

    Hi all, STATWORX is a data science and statistics consulting company, located in Frankfurt Germany. Currently, we are looking for entry level and experienced data scientists. You can find our job offerings in our data science consulting page (German language). Feel free to apply to any of our...
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    Need help with a theoretical question

    Here is the question: How does the return distribution relate to the normal distribution if the return horizon becomes longer? :yup:
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    Books for Stats

    Hi All I am doing the MBA program. We have stats in our syllabus. I have strong mathematics background, however, I am not finding enough books to practice stats from. The questions we get aren't direct. We always get questions with a data set, which we solve using Excel/Data...
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    Urgent!

    Please please help me! Hello there :) It's probably really straight forward but I'm having a very hard time trying to find a relationship between variables. I have an variable (Self-esteem) and I'm trying to assess whether there is a causal relationship between low self-esteem and if they...
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    URGENT! Reviewing SPSS output

    Hi guys, I'm needing help with figuring out my results for logistic regression, I have to get this in to my supervisor in 6 hours and I'm freaking out! I'm sure it'd be easy as pie for someone who knows the basics.. I've never been good with statistics, if anyone is willing to help can you...
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    Help regarding th topic: Shrinkage Precision Matrix Estimation with Application

    'Shrinkage Precision Matrix Estimation with Applications to Beamforming' or 'Shrinkage Estimation Precision Matrix with Applications to Beamforming'. I need help urgent regarding this topic. Any help like resources, references or how to solve this topic assignment please provide.
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    I need some help for my thesis about t-testing different data sets

    Hello everybody, I'm conducting research on price dispersion to show that offline price dispersion is significantly smaller than online price disperison. I have up until today, monitored and collected over 1500 prices in excel on several homogeneous products in...
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    Analyzing Tagged Content: Is a Multiple Regression Analysis the Right Approach?

    I’m working with a relatively small data set that consists of several hundred social media posts, key engagement metrics and up to 10 content “tags” that describe the image of each post. We leveraged Google Vision API along with a manual review to construct the tags. I’ve linked to an example of...
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    ANOVA? Looking at percentage habitat use (6 different habitats) across four seasons

    Hi, I am trying to look at whether habitat use of 6 different habitat types differs across 4 seasons. I have managed to run ANOVA tests but I'm not convinced this is correct. The code I have been using is as follows; an.aov=aov(Month~Heathland) an.aov summary(an.aov)...
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    stat questions on multicollinearity

    I'm working through some practice on regression analysis and wanted to confirm. My attempt is below. Thanks (1) The correlation between two orthogonal predictor variables is: a. 1.0 b. 0.0 c. 0.5 d. Correlation does not exist. (2) Consider a regression model with predictor...
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    All this data and IDK what to do with it.

    I need assistance. I am an undergrad social work major in a stats class. I have access to excel and SPSS. My research question: Does the lack of diversity in X Unified school district teachers contribute to racial disparities in suspensions? I have collected the data for 2014-2015 for 9 high...
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    Data scattered around y=x

    Hello everyone, I am a researcher in engineering. I do have some background on statistics and mathematics in general, but I am not a professional like many of you here. I hope you can give me some insight regarding the problem I am facing. I have a set of data scattered more or less around the...
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    Sign differences in coefficients arising from using ordinal vs continuous data

    I run a simple OLS regression: y=a +bx+.....+e, I obtain an estimate of b<0. Prior researchers running the a similar regression obtain an estimate of b>0: I'm trying to reconcile this difference. The only methodological difference driving our results is the following: In my study...
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    Help with choosing the correct analysis method

    Hello, I have abit of a tricky question for you, but first some context. I carried out a study where students completed 2 sets of questions, and had a survey after each one. The first several questions of each survey are identical. What i wanted to measure is how well they did compared to how...
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    Finding an overall level of Motivation (from a motivational questionnaire)

    Hi, i was hoping i could get some help concerning the statistics of factors in a Motivational Questionnaire. Long story short, in the company i work for, we are about to test a bunch of people and pick some people over others. The test is based on motivation, and the end result is results in...
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    Regression Analysis

    I was working through the following set and needed some clarity on them. I attempted these questions (with my answers below) but need help to see which ones might be incorrect and if so, WHY Thanks (1) Linear regression assumes: a. The relationship between X and Y is a straight line...
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    Hypothesis testing and minitab

    Hi New to the site - I've managed 11 out of 13 questions for my final set of Master Black Belt homework but now stuck! Can anyone offer an explanation to this question and how it could be answered in minitab? I've had a very extensive look online and found multiple solutions but cannot work...
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    Probability of developing a lung cancer disease

    I need to solve this problem: A cohort study is done to assess the impact of smoking on lung cancer. In this study, a large representative sample of first year university students are followed for 40 years. For each student, the smoking status is recorded as well as the lung cancer status at...
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    Basic probability help

    Mechanical Engineering reported on the need for wireless networks to monitor the quality of industrial equipment. For example, consider Eaton Corp., a company that develops distribution products. Eaton estimates that 90% of the electrical switching devices it sells can monitor the quality of the...
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    Simulating a ranking/draft system in R

    Trying to simulate a draft/ranking system based on prior, already existing individual team rankings in R. Here is the full link to the question: http://stackoverflow.com/questions/42093872/player-ranking-draft-system-simulate-a-draft-overall-ranking-system-based-on-pa