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Questions tagged [descriptive-statistics]

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.

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Descriptive statistics (frequencies, counts, proportions) after multiple imputation

I recently ran a multiple imputation using the mice package in R to generated imputed datasets. I have no problems with running inferential statistics on the pooled data (logistic and Cox regressions) ...
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3 views

Can Mplus run invariance testing if you only have access to summary data

Does anyone know if you can run invariance testing if you only have access to summary data. I have one data-set with full item level information and can only access summary data on another data-set (...
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5 views

Understanding percentile computation [duplicate]

I understand percentile in the context of test scores with many examples (eg. you SAT score falls in the 99th percentile), but I am not sure I understand percentile in the following context and what ...
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0answers
10 views

Understanding lift curves

I understand the the cumulative gains chart shows the percentage of found targets (y-axis) (so the sensitivity) against the number of tested observations (x-axis). For the lift chart it seems that ...
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1answer
26 views

How to establish the effects of a competitor near my store location?

As part of my studies of statistics, market analysis and data analysis, I’m facing the following problem but not sure if the answer I’m proposing it is correct or not. A commercial retail store with “...
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0answers
11 views

Hypothesis statement for Factorial design

I have a factorial design with two independent variables A and B. The factor A has 2 levels and factor B has 5 levels. Now I want to see their main effect and interactive effects on X. I am not sure ...
6
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3answers
123 views

Fit data to parametric distribution

I have data with nice bell-shaped histogram PDF. However, the Normal distribution fitting (by calculating mean and variance) does not work as the figure below. My question is that if there are other ...
6
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2answers
470 views

Can two different distributions have the same value of mean, variance, skewness, and kurtosis?

Assuming that you have two discrete population distributions. Can they have identical values of mean ,variance, skewness and kurtosis while being different in shape visually ? Do these four values ...
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0answers
21 views

Calculating CI's using bootstrapping on the holdout test dataset

I’m trying to calculate 95% confidence intervals for the sensitivity and specificity of a decision model that I’m building. I’ve split my dataset into 90/10 train and test sets. I’ve used the 90% ...
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1answer
22 views

Finding P(X<2) where X follows a normal distribution [closed]

How can I calculate P(X<2) when X follows a normal distrubtion where the mean is 1.5 and the variance is 4. The solution should be 59.87%
2
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2answers
30 views

Combining two means and SDs of one group [duplicate]

I have the mean & SD of several different time points, I want to combine them into one mean and SD. Is it possible? Example; At 1 hour; mean=5, SD=1, n=42 At 2 hours; mean=6, SD=3, n=42 and so ...
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0answers
26 views

Hypothesis Causality Validation

I have analyzed mortgage data to define a "typical" profile for a first-time home buyer in 2017. Now that I have this information I would like to explain the trends shown in my graphs: why is the ...
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1answer
183 views

Should data be split into test / training prior to descriptive statistics being carried out on it?

I have a data set that I have added to and plan to carry out some modelling with. I'm wondering whether I should split the data into test / training prior to carrying out the modelling, or if I should ...
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0answers
17 views

Performing one-way Welch's ANOVA using summary statistics

I want to test for a difference between four independent groups. I have three unequal samples with raw data, and one sample for which I have summary statistics only. I want to compare all of these ...
0
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1answer
41 views

Calculate Median Value of Likert Scale data

I have a dataset in a Likert Scale: strongly agree, agree, neutral, disagree, strongly disagree (see attached). (i) Is there an online calculator that can used to calculate the Median for each item ...
1
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1answer
19 views

Comparing the mean of two Likert scales with only one (no) group

I have data from several Likert Scales which look at how people feel about object a - e. I want to compare the means of these results and see whether people feel differently about object c and object ...
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1answer
28 views

Correlation between Discrete Event and Continuous Parameter Change

Does the temperature in the room increase when we turn on the furnace? Intuitively the answer is yes. Practically the answer is yes. BUT, how do we prove it statistically? If I have a time series ...
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1answer
39 views

Numerically Distinguish Between Real Correlation and Artifact

I'm looking at correlation for a large number of vectors, and many (about 3000) of these pairwise comparisons appear to have a significant correlation even after Bonferroni correction. Plotting these ...
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0answers
27 views

What do my mean and standard deviation tell me?

I have American State level unemployment rates in 3 waves of longitudinal data. When I describe unemployment rates for my descriptive table I get the following: ...
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0answers
32 views

How can we use the basic statistical analysis in R to answer these questions?

I have come across this task which refers to the the simple statictical tests, such as Student's T-test, binomial test and chi-squared.Also this task can be done with the help of descriptive ...
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2answers
71 views

Measure that takes samples that is minimized in expectation for a uniformly-distributed random variable?

I am having trouble thinking of a function that operates on a set of samples, that is, single-valued random variables between zero and one, $x_i \in (0,1), i\in\{1,2,...I\}$, and provides a measure of ...
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0answers
24 views

Hypergeometric Confidence Intervals

I need to create a confidence interval for the mean and variance of hypergeometric distribution of random numbers in R. Does anybody know how I can do this?
1
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1answer
73 views

Principal component analysis- covariance or correlation matrix [duplicate]

I am doing a PCA on 24 satisfaction variables from a survey. Respondents indicate their levels of satisfaction towards different aspects of the service. These variables are all measured in same unit,...
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0answers
13 views

Normalisation with different kind of variables with different scales

I have a data frame with 5 variables, first three are numerical variable with different ranges i.e. first: (1-100), second: (50-500), third: (0-2000) And other 2 variables having count of some events ...
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1answer
26 views

Applying inferential statistics for customer data

This may be a dumb question, but I don't understand when to use which statistics. Please explain. So I have the customer data with columns like registration and tenure. Registration column values ...
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0answers
17 views

Do I need to standardize my likert data for principal component analysis?

I am doing a PCA and I am analyzing 15 performance variables. All of these variables are measured from a scale of 1-5 (1 very dissatisfied, 5 very satisfied). Do I need to standardize the data for ...
0
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1answer
27 views

How to realize binomial test in R using data? [closed]

I should do test these data using binomial test (2 first tasks). I have no idea how to do this! I will appreciate any help or mind-joggers!
3
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1answer
32 views

Looking for a statistical test which will test whether the “spread” from a line is statistically significant

Below are two examples of two x-y data pairs: The top example clearly has more "spread" from any sort of linear trend between x and y. The data points are clustered together but there are some ...
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0answers
19 views

Can someone explain what the difference is in the p value of the summary output and emmeans (pairwise, least square means)?

I have a model: m_ramet<-glmer(ramets_net ~ salt * typhagroup + ramets_start + (1|site),data=morphdata, family="poisson"(link="log")) and am ...
1
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1answer
41 views

Robust analogues of Mean, CV and Skewness

I need to characterize the mean, CV and skewness of my observed data (it is gamma-like distributed). This data is an artifact (outliers) enriched, so I decide to use robust statistics: median, ...
2
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0answers
24 views

How do I compare measurements from three different particle sizers?

I have three devices to measure the size and concentration of particles in dilution. None of these is treated as a gold standard. I want to evaluate the accuracy and error associated with each device....
0
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1answer
47 views

How do I calculate the average coefficient of variation?

I'm a biochemist and I usually compare the variability of my measurements in terms of coefficient of variation (CV) since I can "visualize" the deviations more easily in terms of percentages deviation ...
0
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1answer
18 views

Using summary statistics from full dataset for feature selection

I want to generate some summary statistics and look at the correlation between the variables of my dataset to remove certain features (very low variance, very high correlation). The dataset is the ...
3
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1answer
35 views

Why clustering metrics are worse while adding some features?

I am facing something unexpected at first sight and would like to know if you could share some insights. Basically, I have performed a clustering on both qualitative and quantitative data using the ...
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0answers
5 views

infer if absolute or relative time series

I was wondering if there is a statistical test or method for estimating the likelihood a time series is the absolute value or relative move. For example I have a large database of housing indices ...
1
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1answer
22 views

Exponential family form for product of Gumbel distributions

Consider the Gumbel distributions $(P_\vartheta)_{\vartheta\in\theta}=(G(\beta,\mu))_{(\beta,\mu)\in(0,\infty)\times\mathbb{R}}$ with distribution functions $$F_{\beta,\mu}(x)=e^{-e^{-\frac{1}{\beta}(...
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0answers
82 views

What's the best way to display summary statistics for categorical variables?

I collected data that includes factor variables, like employment status and even age (collected as "between 20 and 30", etc.). I know how to make summary statistics table in R or Stata, but I can't ...
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0answers
8 views

Randomised controlled block experiment - choosing the blocks

I'm confused about how to decide blocking, and what that means for experimenting with it. I've seen other questions on the site and don't feel that they answer this, I think this is more basic. For ...
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0answers
21 views

How do I interpret these cluster validation metric scores?

I have written some code for clustering / unsupervised learning. I have used 3 datasets of 57, 5K and 48K records each I have used several clustering methods: HAC / Agglomerative clustering KMeans ...
0
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1answer
31 views

How to better rank based on ratings that takes the number of reviews into account?

Normally on most websites when items are being ranked based on reviews, they’re simply based on the average rating (out of 5 or 10); however, I believe an item that has an average rating of 4 based on ...
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0answers
5 views

Summarizing File Usage Data Across Multiple Devices

Analyzing an an enterprise environment where large number of Windows end user devices have low disk space. To identify causes of the low disk spaces I ran scripts which provides the total size for ...
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0answers
66 views

Chi-Square tables in APA format using R or SPSS

Does anyone know how to automatically generate APA formatted crosstabulated Chi-Square tables in R or SPSS? I haven't been able to find a satisfying solution so far. The closest one is APATables R ...
0
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1answer
82 views

Different p values for anova and summary in lme

I have done a repeated-measures study with two between variables: Groups (Control vs Experimental) and Religious affiliation (Yes vs No). The task was to rate 10 stimuli (images) on a 5-point Likert ...
0
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1answer
12 views

SPSS Statistics

The variance measures how far each number in the set is from the mean I have 151190 records of a table. and i have to analyze the data on SPSS. after the analysis i have some results. Mean=74617.92 ...
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1answer
25 views

Showing these statistics are ancillary

Let $Z_i = X_{(n)} - X_{(i)}$ for $i=1,2,\dots,n$ where $X \sim N(\mu, 1)$, and $X_{(i)}$ is the ith order statistic of the sample. I want to show $Z=(Z_1,\dots,Z_{n-1})$ are ancillary for $\mu$. My ...
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1answer
27 views

Pros and cons of using a median version for measuring dispersion?

If a data set is in the presence of some outliers, then the sample average could not be a "fair" measure of the centrality of that data set. Instead, the sample median could be a better choice. ...
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2answers
44 views

Measure spread of non normal distribution?

I have sentiment data for customer reviews drawn from a larger population of reviews. Each product has a number of customer reviews. Each review has a sentiment (opinion/feeling) between 0 and 1 where ...
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1answer
11 views

Is it possible to derive the total (aggregate) Income of a region from the deciles of single individuals incomes and total population?

I would need to derive the total (aggregate) Income of a certain region (to then compute the average). I have data on: disposable income for each individual of the region, but in deciles: 1st decile:...
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1answer
16 views

Comparing impact of one variable on another SAS

I have two variables as below. I want to compare if AverageDrive has any impact on the totalStrokes. I have tried running PROC CORR, but wanted to understand if there is any other test that I can run ...
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0answers
17 views

Test to check scores of a group across four days

I have a set of scores for a group of people for four different days. The scores look something like the below. I need to find if the scores are different across each rounds. If it was two scores I ...