Questions tagged [analysis]

For questions dealing with the applied analysis of a specific dataset or design of experiment. Posts tagged analysis are requesting statistical consulting assistance from the network. Questions tagged analysis need to be phrased appropriately.

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12 views

proper comparison of averages

I have a data set in hand that shows me the average GPA per school in a district for the last three years. My goal is to rank each school based on %change from the 2018-2019 year compared to the 2020-...
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11 views

How to find parameters of sigmoid function given two thresholds?

Let's say I start with a sigmoid function $$f(x) = \frac{1}{1+\exp{\frac{-(x-c)}{d}}}$$ where the upper limit is 1 and lower limit 0, how can I for example find the appropriate values of the ...
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25 views

Is it right to join two groups followed in distinct periods of time of the same length in one single Kaplan Meier estimate?

I followed two groups of people for one year. Both were subjected to the same conditions, just in two different periods. One group was followed throughout 2019 and another was followed throughout 2020....
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10 views

Best methods to analyze the results of a pairwise comparison survey?

I have recently conducted as survey where I was comparing a range of different images. Due to screen size constraints I decided to display these images pairwise and ask the participants to pick one of ...
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1answer
22 views

what type of data analysis should I carry out

In my experiment I have two groups each with 30 participants (experimental group and a control group) The experimental group consists of autistic individuals and the control consists of neurotypical ...
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6 views

Average variance extracted (AVE) with correlated error terms

after conducting a CFA I did some modifications to include correlated error terms (Error covariances) in my measurement models. Now I am wondering whether I need to apply a different formula für AVE / ...
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14 views

Experiment Design: Best way to detect seasonality patterns in trading data?

I wanted to analyze crypto derivatives data and see if there is any seasonality/patterns to it. I have a daily dataset for about 400 days, and wanted to check for weekly/monthly/quarterly seasonality. ...
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1answer
48 views

Which of these regression analysis to use?

I come primarily from a machine learning background, which I believe is what you'd say as a predictive form of analysis. However, I am now trying to publish some results in a paper about how different ...
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1answer
16 views

Reduced Chi^2 value interpretations below 1

I have an experiment where I have fitted an exponential decay over some data taken from a radioactive decay experiment. The fit yields a reduced X^2 of less than 1 What should be inferred by a X^2 of ...
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15 views

Which model to use for analysis of data from Likert scales?

I have a dependent variable scored from 2 to 10 (this is calculated from two questions with a 5-point Likert scale, strongly disagree to strongly agree, one of which is reversed) I have 5 independent ...
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How to compare two groups with respect to the relative change in outcomes after treatment when there are two repeated measurements — pre/post test?

There are two groups of patients, say, young and old, and we want to determine whether these two groups of patients react differently to our treatment. Let $X$ be a continuous dependent variable, say, ...
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Find out the adjoint operator of $\mathcal{A}(\mathbf{X})=X_{11}+X_{12}-X_{31}+2 X_{33}$ [migrated]

$\text { Suppose } \mathbf{X} \in \mathbb{R}^{3 \times 3}, \mathcal{A}(\mathbf{X})=X_{11}+X_{12}-X_{31}+2 X_{33}, \text { find } \mathcal{A}^{*}$ The definintion of adjoint operator (for vector): $(\...
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Exploratory factor analysis and multiple regression

I am conducting an exploratory factor analysis on 62 variables, from which I have extracted 5 factors. I would now like to understand how gender (1= male, 2=female, 3=other), drug use (0=never, 1=...
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47 views

Which regression analysis to use?

I have percentage change data compared to a baseline of public and private transport activity over 1 year. With the help of one or two independent variables I want to analyze if there is a switch ...
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34 views

I need help choosing a statistical method for my problem

I have 12 tools from different labs that are similar to each other. They measure two different parameters (green intensity and red intensity). I have 4 samples that will be measured 3 times each by ...
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16 views

critical effect size

I am wondering for the value of power to put as input parameters when computing the critical effect size via a sensitivity analysis on Gpower. Indeed, given that "typically, although not always, ...
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18 views

Identify non-linear trend to know when to use log transformation in ARIMA?

There are basically three often used approaches to make time series stable based on three difference scenarios: 1) first difference for linear trend; 2) log for non-linear trend; 3) log seasonal ...
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20 views

Does Sklean have a Gaussian Discriminant Analysis (GDA)

I was trying to look for the Gaussian Discriminant Analysis in sklearn however I was unsuccessful and I was wondering what it the name of it. I was about to find the LinearDiscriminantAnalysis and ...
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6 views

What statistical analysis? Three continuous independent variables w/ one categorical dependent [duplicate]

Trying to find what type of analysis to run. Im trying to determine if three continuous variables can predict a categorical dependent variable (physical activity) w/ three levels (high, medium, and ...
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61 views

Sum of individual parts not adding up to the whole

I am analyzing the WoW change in conversion rate (visitors who booked / visitors). Let's say the WoW change from week 1 to week 2 was -10% (dropped 10%). Now, I want to know what/where this drop in ...
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12 views

Good measures to quantify the effect of outliers

I have two random quantities linked to a set of N random variables. Increasing N The two random quantities should gradually become similar (meaning that the 2 distributions narrows around the same ...
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1answer
180 views

Difference-in-Difference regression setup with multiple time frames

I want to set up a difference-in-difference regression in order to interpret the effect of ESG-activities on stock performance in different time-frames during 2020 and the COVID-19 pandemic. I set up ...
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20 views

Multinomial logistic regression power analysis

I am looking to conduct a power analysis for a multinomial logistic regression. Categorical outcome variable (3-response measures) and two continuous predictor variables (and an interaction of them ...
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35 views

Understanding Residuals in yellowbrick

I have a problem understanding the residual plot from yellowbrick. I have created the following plots: If I take a look at the first one: It shows the predicted value on the $y$-axis and the real ...
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25 views

Repeated Measures analysis of variance

I am new user of R software. I have 2 types of experiments. I want to analyze data from 10 jujube varieties and harvested fruits at 4 maturity stages. The effect of varieties is fixed while that of ...
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28 views

fNIRS (brain) data: what is t-statistic, f-statistic, and beta values?

I am working with fNIRS data, specifically the NIRS toolbox (made for MATLAB). Through some preprocessing an analysis using a GLM, I get nice-looking data and it plots well, but I do not yet ...
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18 views

Accounting for unequal sample sizes - offset() code and which data to use

I have a set of data that contain two separate species placed in 4 habitat types. One of the species has 10 less organisms than the other for a particular habitat and I was hoping to account for the ...
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6 views

How can I compare multiple response using different categories in same question?

I have a been asked a question regardining multiple responses and got stuck on what is best way to go about it. Here are 2 questions that the respondents where asked. Q1. Do you work in a private ...
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19 views

Do I need to use a significance test?

I have just started studying statistics needed for data science. I am using the " Statistical Methods for Machine Learning" book by Jason Brownlee and Statquest videos as reference . I tried ...
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1answer
26 views

Mediation analysis with more than one predictor

I conducted a mediation analysis with 6 predictors, one mediator and one outcome variable. Now I am trying to write up the results but I am not quite sure how to structure my report... (e.g.: write ...
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1answer
36 views

what family of function could that be?

I would like to find an analytical expression for a family of function that would look like the curves in the plot. Essentially ranging from the identity function up to sqrt kind of curve. What ...
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19 views

How do I interpret fit statistics SEM and Modindices output?

I would need some help in understanding the SEM output. I run a latent change score analysis to test the change score of a variable of interest at two-time points (repeated measure) PLD1 and PLD2. in ...
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21 views

categorical dependent and independent variable

I am interested in investigating the impact of the localization of malignant lung tumors on the pattern of lymph node metastases. The localization of the lung tumor is a categorical independent ...
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20 views

Variance Inflation Factor calculation problem

I am posted with this question that I really need help! A regression model includes 10 explanatory variables; the value of R squared for explanatory variable X1 with respect to other 9 variables is 0....
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1answer
37 views

How to Interpret p-value from multi-curve Kaplan-Meier Graph

I've generated a few KM graphs from TCGA data. I am unsure of what the p-value provided by the function and the graphed chart indicates. I just looked through the survival.pdf from cran but am still ...
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1answer
47 views

Questions about Data Analysis

For my research I'm examining whether applying a certain promotional intervention improves the amount of misshapen products bought. The study contains of two parts. In part 1 Scanner data from ...
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12 views

Method of Data-Analysis

For my research I'm examining whether applying a certain promotional intervention improves the amount of misshapen products bought. The study contains of two parts. In part 1 Scanner data from ...
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1answer
31 views

Method of Data analysis

For my research I am comparing actual purchases (in amounts of products bought) in different conditions. I'm examining whether applying a certain promotional intervention improves the amount of ...
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10 views

Classification in LDa [closed]

I am new at using linear Discriminant Functions. Currently I'm finding it difficult to find the threshold for three classes. And creating an algorithm that assigns each parameters to any of the ...
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1answer
34 views

Question about the effect of administrative censoring time point on survival analysis

Imagine a simple Kaplan-Meier analysis where administrative censoring is applied at time=5 years. In other words, I may have follow-up data on persons out further but i am choosing to censor them at 5 ...
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1answer
51 views

Statistical tool to compare different indices

In my research study, I have determined seven indices to measure a physical phenomenon. These indices are derived from different types of rheological tests but all measure the same phenomenon. Of ...
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20 views

How to analyze ranked data (preference)

I'm conducting a user study where I ask respondents to rank different versions of same sentences by their preference. What would be an adequate way to analyze this type of ranked data? Ultimately, I'm ...
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13 views

approach for trend analysis in water quality data?

I have monthly (100 parameters and 10 years) quality data in 50 monitoring stations. Some groups show strong seasonality and others don't (group: one monitoring station and one parameter). (Time-...
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2answers
67 views

Measuring Circularity of a set of Co-planar points

I am trying to find a way to quantify how circular or symmetric a shape is. What is a good way to measure the circularity of these set of points? I already have the coordinates of the points along the ...
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1answer
43 views

How to deal with very large degrees of freedom? [closed]

I am using a dataset from an online database and the df seems to be huge. I do understand that higher degrees of freedom generally mean larger sample sizes. But can it be so big? If yes how can I ...
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1answer
20 views

Statistical methods for unbalanced designs [closed]

During a survey the number of participants in 2 groups vary by 1:2. Which statistical analysis method is most appropriate and why? Mann Whitney U test is the best test ? with good statistical power or ...
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16 views

Correct interpretation of interaction terms between 2 dummy variables

Using logistic regression, I am attempting to model the marginal effect of being female and earning below the poverty threshold (both binary variables) on predicting probability of developing ...
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27 views

Evaluating classifier with additional data

I have a data analysis problem where I have a blackbox image processing software that detects certain defects (cracks, potholes, expected objects like manhole covers, foreign objects) on a straight ...
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1answer
36 views

How to find Linear regression independent variables for future dates

I am new to the forum and Machine learning world. I have been through multiple linear regression tutorials where the example is stock prices. The dependent variable is closing price and independent ...
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1answer
110 views

Controlling for baseline in pre-post between design: using $\Delta(T_2-T_1)$ or controlling for T1 in the regression model (or both)? [duplicate]

I have a mixed between-within design, with three groups and Pre (T1) and Post (T2) measurements. I'm hesitating on the right statistical analyses to do, but I would like to compare each group to the ...

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