Applied Statistics

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Questions related to Applied Statistics

Help in choosing master thesis topic in statistic & machine learning??

I am a master student in applied statistic, I am planing to do my master on machine learning and its applications in statistics, can any one suggest a new topic in this field?

15 December 2020 6,273 3 View

Statistical test: 1 nominal independent variable and 1 dichotomous dependent variable?

I have a dataset with one nominal independent variable with 10 different levels and one dichotomous dependent variable. What would be the appropriate statistical test to compare the different...

10 December 2020 9,054 29 View

Does high correlation between features always mean similarity in information?

If two or more columns are highly correlated in a data frame, Is it always true that they will convey similar meaning and hence one of them is useless and should be dropped? How does this change...

03 December 2020 7,583 3 View

Which variables are related to transportation infrastructure?

I am conducting research on the "Impact of Transport Infrastructure on Economic Growth" Dependent Variable: GDP Growth (World Bank) Independent Variable : Railways, goods transported (million...

19 November 2020 9,143 6 View

Is it correct to use Inverse transform sampling to model distribution by Cumulative distribution function given in the numerical form?

I have the energy specter acquired from experimental data. After normalization, it can be used as a probability density function(PDF). I can construct a Cumulative distribution function(CDF) on a...

12 October 2020 4,001 3 View

How can I compare whether different levels of factor causes the measurement to vary more than the other?

Suppose that I have a set of certain measurement. There are two factors that can affect the value of the measurement, let's call them the factors A and B. The factor A has 2 levels (levels 1 and...

10 October 2020 2,145 3 View

Can it be useful to standardize the observations over the entire dataset even when the units are the same?

Normally when we standardize the different data points to compare the different data on the same scale. But does it also make sense to standardize data points even when the different data points...

10 October 2020 8,980 3 View

Which is the best statistical approach to an experimental measurement?

Hi everyone, my question is the following. I have to perform an experiment with the aim of finding a correlation between a quantity X (e. g. temperature) and a quantity Y (depending on X). Which...

07 October 2020 4,050 6 View

Number of Estimating Equations Required to Test Hypotheses?

After literature review, current draft as below: Variables: Independent = B (represented by I, M, O, S, C), Moderating = W Dependent = F Control = CV Hypotheses: H1a. I has significant...

19 September 2020 7,207 2 View

How to perform power analysis for a one-way ANOVA in R when treatments variances are not exactly the same?

Hi! I've been trying to perform a power analysis for a one-way ANOVA in R using the pwr package. The equation that is employed for this is based on Cohen's f and assumes that variances among the...

17 September 2020 6,259 3 View

Trained neural network can estimate new observations?

I want to train a neural network with some data that are obtained from a specific country, after the neural network is trained I want to estimate similiar data(observation) for another country Is...

25 August 2020 6,480 9 View

Grey relational analysis (GRA) for two nominal dataset?

I am trying to analyze the relationship/correlation between two categorical datasets. I was going through the Grey theory, particularly because it is suitable for small and incomplete data. I...

08 August 2020 615 6 View

Are two values statistically significantly different if their 95% Confidence Intervals do not overlap?

I estimated the percent tree cover for two fields and obtained as an example the following values ( 95 % CI): 13.67% (11.93-15.41%) and 9.27% (7.8-10.74%) . As the 95% CI do not overlap, can I...

10 May 2020 2,533 23 View

best practices to check linear regression assumptions?

Hi everyone! I'm conducting a linear regression and I need to check the model assumptions. I wanted to ask what are the current best practices, and of you could provide a referente. Furthermore: I...

26 April 2020 8,025 17 View

How to calculate the basic number reproduction of a disease? For example Covid 19?

How to calculate R_0, R_t, beta (the average number of contacts per person per time) and gamma? I try to defined SIR model, my data have infected, death and recovered. My country show the next...

10 April 2020 8,377 4 View

When to include random slopes in linear mixed effect models?

I have been using mixed effect models to analyzing neuroimaging datasets with multiple scanning sessions per participant. All my previous models only included a random intercept, and it was not...

19 March 2020 6,308 6 View

How to analyse sensor output to synchronise it with the physical activity?

I am performing an experiment using force sensors and IMUs to gather readings of orientation from a certain motion performed by the human body. The sensor does not know when and what that...

08 March 2020 7,039 2 View

What is the CDF of Dirichlet Distribution?

I was working on the C++ implementation of Dirichlet Distribution for the past few days. Everything is smooth, but I am not able to deduce the CDF (Cumulative Distribution Function) of Dirichlet...

07 March 2020 9,772 2 View

How to calculate Cronbach alpha using SPSS, if 2 items are “inverse”?

Update I have a scale (12 items) I go to Analysis -> Scale -> Reliability analysis and get my Cronbach alpha (0,5) BUT 2 of my items are «inverse». If I recode this two items as it was not inverse...

24 February 2020 5,321 7 View

Statistical test to find out the influence of environmental factors on fish migration numbers?

Hello, I have collected the numbers of migrating fish (round 25 species) for the last 3,5 years every day. I have also collected environmental data like water temperature, water flow, moon phase...

03 January 2020 7,914 4 View

Trying to statistical analyse two groups of data, each data point is from a different category?

I am a stats novice so need everything to be kept simple, thanks! I am trying to prove there is some kind of statistical difference between two separate sets of data. I have reviewed 56 slides...

30 December 2019 7,411 7 View

Do I have to use a Probit model when trying to analyze a possible mediation effect that includes a dummy variable?

I have a dummy varible as the possible mediatior of a relationship in my model. By reading the Baron and Kenny's (1986) steps, I see that, in the second one you have to test the relationship...

29 December 2019 5,427 3 View

Which metrics exist for comparison of multivariate normal distributions and what are their properties?

I'm working on comparing latent space representations of image patches which are encoded as multivariate normal distributions over the respective latent space. Which metrics - besides (symmetric)...

10 December 2019 6,201 1 View

What are the possible interpretations of the next regression case?

I have reported life satisfaction as my dependent variable and many independent variables of different kinds. Of them, one is the area in which the individual lives (urban/rural) and other is the...

08 December 2019 8,456 7 View

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