Descriptive statistics summarize features of a sample, such as mean and standard deviations, median and quartiles, the maximum and minimum. With multiple variables, may include correlations and crosstabs. Can include visual displays - boxplots, histograms, scatterplots and so on.

learn more… | top users | synonyms

0
votes
0answers
4 views

to constrain a parameter estimate to obtain unique estimates in R LAVAAN for CFA

I need urgent help, I need the script or command to constrain a parameter estimate to obtain unique estimates in R LAVAAN for CFA. Like If Social Influence got 4 items in a model and I want to put a ...
1
vote
1answer
28 views

Are the distances of the kNN i.i.d?

Imagine the set of i.i.d observations $D = \{x_i\}_{i=1}^N \subset X^n$. Let the distance function $d \colon X^n \times X^n \rightarrow \mathbb{R}$ be used to find the $k$ nearest neighbors to the ...
0
votes
0answers
14 views

Finding Power Function for a LRT test

I am trying to solve the following problem: Let $X_1, . . . , X_n$ be a random sample from the $Uniform(θ, θ + 1)$ distribution. Derive the power function for the LRT for $H_0 : θ = θ_0\ vs.\ ...
0
votes
0answers
9 views

Best metric for differences between shares

I am looking for a simple metric to measure the differences in expenditure shares on commodities which were calculated differently. Thus, there are two scenarios, both of which report expenditure ...
0
votes
0answers
14 views

Unsure about what statistical test to carry out

I have a blood count data with a sample size of over 3000. I am dealing with these variables only: age, sex and WBC:Platelet(ratio). I am using SPSS and already done some descriptive statistical ...
0
votes
0answers
24 views

How to detect the inflection point or the change point in a Q-Q plot?

Following are two QQplot. Both of them has an inflection point, which can be found easily by human eyes. However, I'm not sure whether there is a robust statistics way to find it.. Does anyone have ...
2
votes
1answer
42 views

How to properly display changes in percentages over time?

Our company is developing self-learning software that extracts data from documents and enters it automatically into text-fields in some other software, on behalf of the user. These suggestions aren't ...
0
votes
1answer
13 views

what method to test percentage against population percentage?

I have population of 6 regions, and also customers from these regions. What is the best way to test if the percentages of customers from these regions are about the same as the population ...
1
vote
0answers
136 views

How to extract distribution information from descriptive statistics?

In my thesis, I am trying to perform a Monte Carlo simulation with a set of parameters, where I take a random value from a known distribution to calculate a singe run of the simulation. However, for ...
0
votes
3answers
55 views

What is the difference between doing a linear regression and exhaustive descriptive statistics?

I'm doing a report of the differences between women and men in their performance on a test with variables like: age, education, race and of course genre. I have two options: doing a linear ...
1
vote
1answer
31 views

Why run a post hoc wilcoxon signed rank test after Friedman test, why not just skip to Wilcoxon sign test instead?

I understand that one is required to run post hoc tests after the Friedman test. For example, while the Friedman test may find a statistically significant change amongst 3 treatments, one may follow ...
1
vote
0answers
12 views

What type of statistical models would be useful for evaluating an athlete's performance?

Suppose a performance athlete wants to use statistics to design an optimal exercise regimen. The goal of the statistical model should be to essentially maximize the performance of the athlete by ...
0
votes
1answer
34 views

Does descriptive research have dependent varibles?

I am doing a research proposal for a descriptive study to identify the health beliefs and perceptions among women to mammography breast cancer screening. I am using a Likert scale that is divided into ...
0
votes
2answers
24 views

Can I obtain the means for two groups using their mean difference?

I have a study which provides the mean difference for two groups (alongside 95%CI, SE, n and p-value). I would like to extrapolate the raw means to use in Revman to perform a random-effect SMD ...
2
votes
0answers
17 views

Difference between volatitlity of Annualized return and Annualized volatility of returns

I have a series of monthly returns on financial data. My goal is to estimate the volatility of 10 year rolling returns. I am a bit confused on two options. a) Calculate 10 year rolling returns, ...
1
vote
1answer
36 views

Clear explanation of Cronbach's Alpha

I have difficulty in understanding Cronbach's Alpha's formula. I searched for google and StackExchange able to understand it. Even there are some topics trying to explain it intuitively, I could not ...
2
votes
0answers
56 views

Non-direct measurement and degrees of freedom

Background and current intuition In statistics, degrees of freedom are used to characterise the number of independent observations after some statistic has been calculated. The most common example is ...
1
vote
0answers
19 views

Checking that partition is not “random” [closed]

Suppose there is a set of objects. Each object has its coordinate on a sphere and one scalar feature. Imagine that someone divides these objects into several non-intersecting subsets. And we have to ...
1
vote
0answers
35 views

What are methods for computing the descriptive statistics of interval measures?

I do several measurements and obtain for each: $m_i = x_i \pm \delta x_i$. What are the mean and the standard deviation of a such series of measurements?
2
votes
1answer
29 views

Cronbach's alpha vs. Average Item-Sum correlation?

I have heard that Cronbach's alpha is used to measure reliability of a test (to check if a set of items/question are measuring the same construct). How does the Cronbach's alpha compare with the ...
1
vote
1answer
54 views

Identification from minimum value of truncated distribution

Suppose that a given population is endowed with a pair of characteristics $T$ and $K$. Let's think of these characteristics as random variables $$(T,K) \sim \operatorname{BiNormal}((\mu_T, \mu_K), ...
1
vote
0answers
22 views

How to approach analyzing a dataset of baby speech?

I've been collecting speech data for my baby brother (who is now 6 months old) with the intention of doing computational analysis of the development of his speech patterns. I haven't much deep ...
0
votes
0answers
7 views

How to form indices to rank importance based on two variables?

I have two variables: average absolute difference of car grades for every two auctions, and count of vehicles that were inspected in those two auctions (ex: THA and NA). I have almost two thousands ...
0
votes
0answers
28 views

How is finding outliers using extreme value theory different from setting threshold on a pdf of normal events?

Suppose we assume that the data follows a Gaussian distribution. We can set a threshold on its pdf to find outliers. How would it be different from setting a threshold on a pdf, fit the exceedances ...
0
votes
0answers
9 views

Techniques for building growth discovering engine

Since I am trying to analysis and implement similar kind of solution, I am interested to learn about which are the statistical techniques can give me result like this. I know correlation is the one ...
1
vote
0answers
56 views

Are the following interpretations of EViews output correct?

I just wanted to know if my interpretation of the follow values were right: Std. error (of each independent variable): Indicates the likely sample variability (and hence reliability). Estimated ...
1
vote
0answers
18 views

What is the sample size in this experiment?

We have to determine the sample size in the following experiment. We are trying to determine the concentration in which a combination of drugs works the best against cancer cells. This involved cell ...
3
votes
1answer
32 views

Practical use of descriptive statistics

I'm working with a data set in stata that contains information on how much each customer spent on service a, b, c, and d. But most customers don't have every service and this has resulted in a lot of ...
1
vote
0answers
11 views

Label reduction on dataset

This question related to this other one, for which I have devised a strategy and now want some feedback on it. My data consists of 434042 rows, each corresponding to an observation tagged with 1 of ...
1
vote
0answers
28 views

Is it ok to ignore data in this instance?

I'm running a program in python I wrote to look at the first spiking time of a neuron in a stochastic network. I'm running about 2500 realizations for each set of parameter values to calculate the ...
0
votes
0answers
30 views

Reducing number of labels in a dataset

I have a dataset that contains of 13 variables, of which: 5 are binary (T/F). 4 are categorical. 1 is ordinal (ranking). 1 is continuous. 1 is the time component. 1 is a final categorical variable, ...
1
vote
0answers
14 views

People detection in a supermarket zenital video

I am programming a people detector in a supermarket environment. I am using a dataset that I built from an example vídeo with 500 people and 500 background pictures which have 128x128 size with HOG ...
1
vote
1answer
38 views

Measure of central tendency for periodic variable (hour of day)

I have a dataset that shows, for each group, the number of times a certain action was completed during each hour of the day. ...
1
vote
1answer
16 views

What to report for reliability analysis?

After completing data collection on a reliability analysis where multiple examiners sampled each subject three times, which value should I report for descriptive statistics? If intra-rater reliability ...
0
votes
0answers
17 views

goodness of fit using chi2gof probability distribution curves in matlab

We have sample data,that we need to make goodness of fit to find the best fit using chi2gof in Matlab this is the used code: ...
1
vote
0answers
22 views

Binomial vs inverse binomial transform in obtaining moments

I am trying to obtain raw co-moment matrices from central co-moment matrices and I have found formulas for the transition from central to raw moments here . I have also found the opposite, that is ...
0
votes
1answer
63 views

Help coming with a descriptive statistic

I have some data about employee performance that I want to create a descriptive statistic for that can easily show at a glance how efficient the employee is. Let's start with some sample data: (The ...
2
votes
1answer
45 views

How to compute the central tendency for such a distribution?

Consider an annular region of space. We divide this annulus into four equal regions and we take some measurements in each of the four sectors. Imagine we are measuring something like a particle's ...
0
votes
0answers
11 views

what statistical test for relationship between categorical variable and scale variable?

I have 66 set of data containing two variables; Culture divergence (1=congruence, 2=divergence) and performance score. I am testing two hypotheses: Culture congruence promotes performance ...
0
votes
0answers
9 views

Correlation in longitudinal data analysis

There is a thesis claiming a significant negative correlation between variable A and B. It used the ordinary least square controlling for 4 other variables C,D, E, F (some are continuous, some dummy) ...
0
votes
0answers
24 views

Regular weighted average vs. Kernel Weighted average

I am somewhat familiar with using kernels for density estimation (i.e. KDE), but not so much with using them as weights to calculate weighted averages. I am looking for some intuition on the latter. ...
1
vote
1answer
49 views

What is the Distribution of Sum of Squared Errors?

I know this might be a very basic question for anyone, but I'm not sure how to answer it correctly. It was recently asked at an interview. It would be great if someone could help me with answering ...
0
votes
0answers
10 views

Calculating trends and averages on skewed data?

I'm running analysis on an Audit that has been distributed over the course of a year. There are currently about 40 or so different audits. Each audit contains 90 questions. When the audit was first ...
4
votes
2answers
96 views

Best way to report mean±SD of p-values (all values are positive and SD is larger than the mean)

I have 50 p-values. I want to show the mean of these 50 and the standard deviation: 0.06 ± 0.19 The standard deviation is quite large, because although almost ...
0
votes
0answers
8 views

how does the Qn estimator work

I was given a short introduction to alternative robust methods to the MAD used in statistics, one of them being the Qn estimator. This one is denoted as: \begin{equation} Q_n = d( |(x_i - x_j)|:i<j ...
3
votes
0answers
40 views

alternative to IQR

I am currently making a short literature study on robust and efficient estimators. Some very well known are the median absolute deviation (MAD) and the interquartile range(IQR). However they both have ...
1
vote
1answer
56 views

Comparing two datasets with same variable

thanks in advance for anyone taking the time to read/answer this. I am comparing a ground-sourced dataset versus a satellite-sourced dataset for weather conditions, such as temperature. Both sets are ...
0
votes
1answer
17 views

Undocumented Migrants and Parameters

I have a question about using census data to find population parameters. When you have undocumented migrants, there's an issue because your parameters can be inaccurate. An example is proportion of ...
0
votes
2answers
93 views

How to profile, visualise and understand large number of groups/classes/clusters in data [duplicate]

I am working on clustering a medium-sized, high-dimensional data set (200k rows; 120 columns). Once I have attempted (multiple) cluster solutions, I would like to profile my clusters and understand ...
0
votes
0answers
13 views

Is there a natural way to determine a threshold for required number of data points?

Often you want to compute a statistic, but only for entities that meet criteria for having a meaningful sample size. For instance, in baseball you often see a footnote like "among batters with at ...