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37 views

Running Multiple Linear Regression in R with 3 Factors and 1 Continuous Variable

I am running a Multiple Linear Regression model using R. I am looking at travel behavior and most of the variables are factors with YES or NO as responses. However, I am concerned about using 3 ...
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0answers
16 views

Is there a resampling method that blends subsampling with the bootstrap?

I apologize if this is an inappropriate question. I thought of it in class the other day, and I couldn't find a specific answer in my textbooks. I am familiar with the two basic techniques for ...
9
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1answer
401 views

When to use Poisson v. Geometric v. Negative Binomial; GLM, the Three Count Variable Distributions

I'm trying to layout for myself when it's appropriate to use which regression type (geometric, poisson, negative binomial) with count data, within the GLM (only 3 of the 8 GLM distributions are used ...
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0answers
29 views

What model to use? Heckman-Two-Stage? Tobit? OLS?

I am currently researching innovation with firm level data. I have a nice dataset, which allows to analyze the variable inno which is ...
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0answers
8 views

Disadvantages of cluster randomised controlled trials

Can anyone explain some of the disadvantages of a cluster randomized controlled trial? I read something about data being more correlation between partiticipnts in each condition/group but I don't ...
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0answers
8 views

Variable selection algorithm based on meta study

Suppose I would like to conduct a survey and want to know which variables to include. Literature review and theoretical guidance both help. What I would like to know is whether there is a way to do a ...
0
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1answer
48 views

Methodological question: adjusting for confounders in logistic regression

I have three attributes in a dataset (D0), representing the binary response of success or failure (R), some form of treatment or treatment group (T), and a potential confounder (C) respectively. ...
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1answer
17 views

Split-half when intermediate values are equal

I am trying to perform a split-half for strategy use, however, as you can see the middle most users have the same score. What is the best approach to perform a split-half in this situation? Do you ...
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0answers
16 views

Best Methodology

I am currently designing a research project on mental health attitudes. I want to test a model that should explain the data. I have 5 variables that should lead in an almost linear causal pattern of ...
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1answer
49 views

Find determining variables between two groups

I have a large dataset with many variables (for example: height, weight, color, category, revenue...) I am trying to compare two groups and find which variables determine the groups. My goal would be ...
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0answers
27 views

Different groups, same intervention. What design is this?

I'm trying to figure out the best way to analyse the following clinical trial: Group1: Healthy individuals Group2: Diseased individuals Both groups follow the same intervention and are tested pre- ...
3
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1answer
189 views

Calculating Diversity using normalized species counts

I am trying to calculate the change in diversity of species encountered throughout time. My dataset is comprised to detections of tagged fish for 48 consecutive weeks. My thought was to bin the ...
0
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0answers
23 views

Okay method to aggregate moving averages?

I want to make a map of investments in foreign countries made by country x. I have collected data for a ten-year period. Since investments change from year to year and there's lack of data for some ...
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0answers
62 views

using loess to smooth data improves correlation. What I'm seeing here?

I'm reviewing a work of some collegues which correlates the daily number of tweets on certain topic with some other indicators. They used of loess smoothing regression to diminish the noise of the ...
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2answers
24 views

Methods for compiler benchmarking?

In computer science, statistical knowledge is quite low in general. You rarely see standard deviation in papers. Now I am trying to improve at least my skills, but I find myself utterly confused about ...
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0answers
54 views

What wrong with this experiment methodology?

The following experiment was devised: a group (random) was divided randomly into 2 : Half were give coffee A the others coffee B, all rated it on a 1-5 Likert scale. Results where analyzed using ...
0
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0answers
57 views

How to determine an appropriate sample size for a normal distributed population?

I am trying to extract a sample from a given population. Assuming the population distribution is normal (I still have to test it, but I am confident it is), since the number of observations in the ...
6
votes
1answer
116 views

Statistics for model selection and model evaluation

In his Dynamic Econometrics, David F. Hendry issues the following advice: When a 'test' statistic is cited, you must ask 'Was that a selection criterion statistic or a genuine test statistic?' ...
5
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2answers
36 views

Validity of combining surveys and sociodemographics to estimate miles walked in census tracts

I ran across this paper that describes an interesting approach to combining survey and sociodemographic data: Salon. Estimating Total Miles Walked and Biked by Census Tract in California. State of ...
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3answers
502 views

What are criteria and decision making for non-linearity in statistical models?

I hope that the following general question makes sense. Please keep in mind that for the purposes of this particular question I'm not interested in theoretical (subject domain) reasons for introducing ...
4
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1answer
172 views

Review of Box-Jenkins methodology

i just finished developing an ARMAX model with python (mostly statsmodels) in order to forecast some data. My next step is to test the data (24 time series) with the given ARMAX model. As i need to ...
0
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0answers
25 views

Methane Flux Undergraduate dissertation [closed]

I'm trying to do a research project into how methane (units mg CH$_4$ m$^{-2}$ d$^{-1}$) and CO$_2$ flux (units mg CO$_2$ m$^{-2}$ d$^{-1}$) in a Canadian peatland is influenced by temperature, soil ...
4
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2answers
86 views

Research methodology, statistical literacy and communication

When talking to clients or offering advice, I often find myself having to question the choice of plotting variables over time. For example, if a client is interested in understanding the relationship ...
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0answers
16 views

Multiple groups - how to regularise estimate of level 1 parameters based on level 2

I am fitting some relatively complex structural equation models, but the specific model is not so important. I am estimating multigroup models, such that one parameter is completely free across ...
2
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0answers
34 views

Violating Independence - Methodological Question

I am looking again at a popular statistical testing method used in finance, suspect it's a bit naughty, but would like to have a more experienced eye take a look also. The method is the following, ...
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0answers
43 views

Methodological advice

I need some help validating the statistical methodology I'm trying to use to analyze some data. My data is from a repeated measures study where each participant did two activities. Half of the ...
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4answers
349 views

A summary of econometric methods

Scikit Learn has a guide for machine learning techniques. Matthias Vallentin did a remarkable cheat sheet/cookbook for probability and statistics. Many heavy summaries of econometric methods are ...
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0answers
20 views

post-stratification of ACS survey

I have a survey methodology question. I am preparing a report that contains some demographic information. My supervisor instructed that I use the NCHS bridged-race population estimates when reporting ...
0
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0answers
13 views

methodology for assessing experimental design

I have pre post data for 5 different groups of kids living in different settings (rural, low income, high income, etc). The variables include age, gender, type of setting, treatment (exposure to one ...
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2answers
40 views

Is there any good reference which statistical test should be used given study design?

I am looking for a source (infographics, picture, graph, list, book, algorithm or whatever) that clarifies which statistical test should be used when. I mean what do I use when I have two unpaired ...
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0answers
85 views

What statistical test is fit for comparing enzyme activity profile of microbial strains

Enzyme activity profiles are profiles of (fungal, bacterial etc.) strains. Usually they are done by using predefined and standardised kits. One of those is for example ''api ZYM (BioMerieux)'' which ...
0
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0answers
37 views

Analysis to use with categorical predictors and continuous response variables

I am trying to figure out what the right statistical test to use is for data where the DV is continuous, and the IV's are categorical. There are a lot of different DV's that I want to run through a ...
2
votes
1answer
53 views

Is this method of finding the confidence interval correct?

Suppose that we have 2 sets of data $X = x_1, \dots, x_n$ and $Y = y_1, \dots, y_m$ and a test $T$ that tests the null hypothesis that these data come from a distribution with the same median. $T$ can ...
0
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0answers
13 views

types of baseline modelling

I'm searching for a model that can be used to decompose incremental effects and baseline effects and is also good at prediction (i.e. Not OLS). We have tried OLS, ARIMAX with exogenous factors, ARIMAX ...
5
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2answers
180 views

Unwritten laws and dirty tricks to influence the outcome of a regression analysis

Background: Some years ago, I was working for a professor specialized in macroeconometrics. As a student research assistant, it was my task to replicate other papers and "play around" with the data. I ...
2
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0answers
44 views

Help finding method of estimating regression parameters for a given performance

Pardon my ignorance, for I have very basic training in statistics, but have never taken a regression course. I ran an experiment where participants are in one of two conditions (between subjects). ...
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0answers
27 views

How did Gallup form this index?

I am reading this Gallup poll, and in it there is a "Positive Experience Index" that is used without really explaining how it was created, and therefore what, precisely, it means. From reading the ...
1
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2answers
62 views

What is the correct term for testing a classification method on different subsets of the same data

I am searching for the correct definition of a methodology I am using to test the robustness of different classification methods. I am creating different subsets of the full dataset by cutting away ...
0
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0answers
14 views

How to analyze a variable measured on a Likert scale and its interaction with another variable? [duplicate]

I have to analyze this variable which consists of scores given to 3 items (1-9 scale). This "Likert scale" measures "brand commitment" if thats important. 1) Firstly, should I compute 1 new variable ...
0
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2answers
95 views

What is the reasonable methodology to study machine learning techniques efficiently?

Nowaday, there are lots of online courses related to machine learning, and there are lots of programming languages which can be used to do data mining, such as R, Python or Matlab. For example there ...
0
votes
1answer
29 views

Non-differentiation

I'm trying to assess the level of non-differentiation for a web survey I am doing. It features six pages of several Likert items on each page with a 6 point scale, followed by a seventh page of ...
2
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0answers
74 views

How to handle unequal sample size with multiple factors?

The following dataset shows observations (count data) of cedar trees growing in small, medium, or large forest gaps (i.e. openings). You can see that that there is an unequal sample size and ...
4
votes
1answer
328 views

Can Goldman Sachs' economists predict who will win the World Cup?

Goldman Sachs decided to apply their brains to predicting the winner of the World Soccer cup. They built a statistical model analyzing past winners. I read about it here, but the original version ...
5
votes
1answer
263 views

What is the right attitude toward open source machine learning toolkits?

There are lots of machine learning toolkits nowadays, such as weka, sklearn, R libs. If we choose to use these toolkits, besides that it is convenient, sometimes ...
1
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1answer
37 views

Multiplicative error in survey data

I'm working on a panel survey data where each individual's income was multiplied by a individual-specific random number (each random number is evenly distributed from 0.5 to 1.5) to avoid any ...
2
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0answers
42 views

Hierarchical classification

I'm currently working on the classification with massive amount of data. Similar to the kaggle one. Data input consist of features and multiple labels that can be hierarchically aligned. At first I ...
0
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0answers
49 views

three variables chemical data analysis optimization

Could anybody help me by giving a solved step by step example of response surface methodology (RSM) using Doehler design for leaching of metals or for chemical processes? My supervisor has given me ...
0
votes
1answer
219 views

How to give the input of an image to SVM after preprocessing

I got a dataset of images(GRAZ_02 Data set-Cars,Bikes,People) and extracted features from each and every image in the database using a descriptor(SIFT algorithm) that returns a matrix of order :(No. ...
0
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0answers
31 views

What is the difference between “data mining” and “data analytics”? [duplicate]

What is the difference between "data mining" and "data analytics"? Are both things the same technically?
0
votes
1answer
23 views

sampling question

I have a question about inclusion criteria to obtain a representative sample of people with "sustained" or uncontrolled high BP. A colleague proposed that I look at health history data retrospectively ...