The tag has no usage guidance.

learn more… | top users | synonyms

0
votes
0answers
6 views

Research on Simulation Sickness combining scenes, methods and types of devices

I hope this is a right place to ask this question. If not, just point me to the right Exchange site. I am doing a research (a thesis) on the topic of Simulation sickness (SS) and methods to helping ...
0
votes
0answers
14 views

What is an appropriate statistic for this problem

I measured an independent variable, Y, at 4 locations: Y1, Y2, Y3, Y4. I assume Y is influences by 5 factors: A B C D E, and measured them together with Y each location. Therefore, Y1 ~ A1 + B1 + C1 + ...
0
votes
0answers
10 views

Do I still need ergodicity if I have multiple/infinite time series of the same data generating process?

The main reason we need ergodicity (and therefore stationarity) is, as Shalizi puts it: The ergodic theorem is important, because it tells us that a single long time series becomes ...
1
vote
1answer
98 views

Independence of two categorical variables & chi-square

I have data as follows: ...
0
votes
0answers
19 views

How to test the relevance of Taylor's rule after the crisis of 2008?

I have a quick query regarding the selection of methodology and test for the empirical relevance of Taylor rule especially after the global financial crisis of 2007 to 2009. I want to capture ...
0
votes
1answer
26 views

Weight or impact of variable in correlation

Consider I've have two curves (catgeory1,category2) that are strongly negatively correlated( -0.88). for 1, I've few sub-category (o,p,q,r,s,t,u,v,w,x,y,z). I want to know the weight of each one in ...
0
votes
1answer
11 views

curve vs 2 curves and correlation

I've data as follows: ...
1
vote
0answers
7 views

Different Effects of Detection Probability Between Presence and Count Data at the Same Location

I'm modeling habitat suitability for a large, mobile animal using occurrence data (presence only---I have no true absence data in this case) collected from camera traps (stations with automatic ...
-3
votes
1answer
25 views

What are some statistical models used in business? [closed]

I am looking for some interesting statistical models and 'rules' that are very useful in a business perspective. Strictly speaking, depending on the business case each statistical method or model can ...
0
votes
0answers
9 views

Meaningful statistical question: what if some values of x have no effect on y

I have a general question about modelling methodology,which can be motivated by a simple example. Consider the following question: How does age affect the probability of voting? More specifically, ...
3
votes
3answers
188 views

How to select or validate the selection of a clustering method?

One of the biggest issue with cluster analysis is that we may happen to have to derive different conclusion when base on different clustering methods used (including different linkage methods in ...
0
votes
0answers
21 views

How to analyze a Semantic Differential?

1) How do we statistically analyze data from a semantic differential? I have seen the results rendered as a graphic joining each point as such
0
votes
1answer
26 views

Methodology: breaking multi-regression apart

I have to perform a multiple regression where my independent variable is store visits, while the dependents include hour of day, day of week, and others. I need to do this in Excel. Excel limits ...
3
votes
0answers
44 views

Rigorous theory behind overfitting

I am taking an intro to ML class, and in my limited experience, training ML algorithms (validation, overfitting etc.) feels a bit like black magic. For instance, you aren't supposed to touch the test ...
0
votes
0answers
22 views

How to test statistical significance to prove that a particular technique estimates a variable better than another technique?

Suppose the following is the scenario: I am estimating the measure of a construct. I have Subject Matter Experts (SME) who have manually (through observation) estimated the measures. Suppose I have ...
2
votes
0answers
26 views

Can I replace traditional DSP with statistical methods

I work a lot with noisy time traces with usually 2.5e6 data points and sampling frequency ~ MHz. I usually apply some "traditional" digital signal processing utilities like low/high-pass filters to ...
3
votes
2answers
70 views

What tradeoffs are there between internal and external validity?

I was reading through an article about research design. The authors gave an example on the relation between internal and external validity which I thought might be an important area of consideration ...
1
vote
0answers
63 views

non-linear regression predictions goodness of fit

I have a non-linear model that, given some parameters and the initial state of the system can predict the outcome of this system after t times. I had train my model using some data and I'm now trying ...
1
vote
0answers
23 views

Statistical methods for adjusting heaping in birth weight data

I have a birth weight data of children under aged 5 years (sample size, n=2000). Data comes from two sources : 1. Mothers recall (n=1500) and Health card (n=500). Naturally, mothers' recall data ...
0
votes
0answers
17 views

propensity match advice

I need some advice on how to tackle this problem. I have two groups (treatment n=30 and no-treatment 400). I want to match the treatment group patients to the other group based on comorbidities and ...
0
votes
1answer
28 views

Appropriate analysing methods for theoretical questions

I am currently trying to analyse a set of data from a survey conducted that has a lot of YES/NO questions. For instance, one question asks if the respondent currently has a data plan with their ...
1
vote
1answer
40 views

Is it methodologically valid to try multiple feature selection methods and report the best?

I am working on a classification problem. I have used multiple feature selection methods, and a model is selected (i.e. hyperparameter optimization) and trained for each of the selected features. I ...
1
vote
0answers
25 views

Accounting for variation between populations when comparing failure rates

Here's my situation. The big picture is that I need to figure out how to compare the failure rates of two groups of widgets, Group A (defect) and Group B (control), in such a way that answers the ...
0
votes
1answer
72 views

Proportion dependent variable (0-1 range) in an unbalanced, non-dynamic panel

I am a PhD student currently performing data analysis for my publication and have the following problem: Dataset: unbalanced data of around 80 firms over 20 year period (due to firms entering and ...
0
votes
3answers
834 views

Distance measure methods of R function dist() evaluation

I want to compute the distance matrix for the columns on a 1000 x 230 matrix using the dist() function in R. Though, I am uncertain about which method to use. I ...
0
votes
1answer
23 views

Can age,education level and socioeconomic status be controlled but not as covariates to strengthen an experimental study?

Most ppl include age, education level and socioeconomic status in their demographics just to show their sample of study. But in my case all those 3 factors are predictors of my DV which is prosocial ...
0
votes
0answers
19 views

Is it possible to decompose 3-factor change in growth rate terms?

Let's say, we investigate what caused the growth in working-age population (W). There are basically three factors causing the change in W. First, mortality at working ages (MT). Second, migration ...
0
votes
0answers
37 views

Is Multiple Regression the right choice for my statistical design?

I am studying the relationship between mental health offices and judgments of perceived care expected within those environments. Participants will rate different photographs of mental health offices ...
0
votes
0answers
113 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 ...
1
vote
0answers
35 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 ...
10
votes
1answer
2k 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 ...
0
votes
0answers
369 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 ...
0
votes
1answer
79 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. ...
1
vote
1answer
74 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 ...
0
votes
1answer
63 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 ...
0
votes
1answer
54 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
votes
1answer
435 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
votes
0answers
38 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 ...
0
votes
0answers
169 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 ...
2
votes
2answers
64 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 ...
0
votes
0answers
71 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
votes
0answers
149 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
233 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
votes
2answers
40 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 ...
8
votes
3answers
777 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 ...
5
votes
1answer
315 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
votes
0answers
26 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
votes
2answers
89 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 ...
1
vote
0answers
23 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
votes
0answers
36 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, ...