The document discusses sampling design and methods. It can be summarized as:
1) Sampling design involves defining the target population, determining the sampling frame, selecting a sampling technique, and determining sample size.
2) There are two main types of sampling - probability sampling which gives all units an equal chance of being selected, and non-probability sampling which does not give all units an equal chance.
3) Common probability methods include simple random sampling, systematic sampling, stratified sampling, and cluster sampling. Common non-probability methods include convenience sampling, judgment sampling, and quota sampling.
Systematic sampling in probability sampling Sachin H
This is a systematic sample in probability sampling which is consider to be one of the technics of sampling . It is most useful in certain circumstances in Random sampling.
Systematic sampling in probability sampling Sachin H
This is a systematic sample in probability sampling which is consider to be one of the technics of sampling . It is most useful in certain circumstances in Random sampling.
Probability Sampling and Types by Selbin Babuselbinbabu1
The presentation will cover probability sampling and all the types of probability sampling like Random sampling , systematic random sampling, strtified random sampling, cluster random sampling and multi stage sampling.
Explains the different methods of Sampling with diagram. In statistics, quality assurance, and survey methodology, sampling is the selection of a subset of individuals from within a statistical population to estimate characteristics of the whole population. Statisticians attempt for the samples to represent the population in question.
Probability Sampling and Types by Selbin Babuselbinbabu1
The presentation will cover probability sampling and all the types of probability sampling like Random sampling , systematic random sampling, strtified random sampling, cluster random sampling and multi stage sampling.
Explains the different methods of Sampling with diagram. In statistics, quality assurance, and survey methodology, sampling is the selection of a subset of individuals from within a statistical population to estimate characteristics of the whole population. Statisticians attempt for the samples to represent the population in question.
"Impact of front-end architecture on development cost", Viktor TurskyiFwdays
I have heard many times that architecture is not important for the front-end. Also, many times I have seen how developers implement features on the front-end just following the standard rules for a framework and think that this is enough to successfully launch the project, and then the project fails. How to prevent this and what approach to choose? I have launched dozens of complex projects and during the talk we will analyze which approaches have worked for me and which have not.
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
Kubernetes & AI - Beauty and the Beast !?! @KCD Istanbul 2024Tobias Schneck
As AI technology is pushing into IT I was wondering myself, as an “infrastructure container kubernetes guy”, how get this fancy AI technology get managed from an infrastructure operational view? Is it possible to apply our lovely cloud native principals as well? What benefit’s both technologies could bring to each other?
Let me take this questions and provide you a short journey through existing deployment models and use cases for AI software. On practical examples, we discuss what cloud/on-premise strategy we may need for applying it to our own infrastructure to get it to work from an enterprise perspective. I want to give an overview about infrastructure requirements and technologies, what could be beneficial or limiting your AI use cases in an enterprise environment. An interactive Demo will give you some insides, what approaches I got already working for real.
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
PHP Frameworks: I want to break free (IPC Berlin 2024)Ralf Eggert
In this presentation, we examine the challenges and limitations of relying too heavily on PHP frameworks in web development. We discuss the history of PHP and its frameworks to understand how this dependence has evolved. The focus will be on providing concrete tips and strategies to reduce reliance on these frameworks, based on real-world examples and practical considerations. The goal is to equip developers with the skills and knowledge to create more flexible and future-proof web applications. We'll explore the importance of maintaining autonomy in a rapidly changing tech landscape and how to make informed decisions in PHP development.
This talk is aimed at encouraging a more independent approach to using PHP frameworks, moving towards a more flexible and future-proof approach to PHP development.
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
2. The Sampling Design Process
Define the Population
Determine the Sampling Frame
Select Sampling Technique's
Determine the Sample Size
Execute the Sampling Process
3. Define the Target Population
The target population is the collection of elements or objects that possess
the information sought by the researcher and about which inferences are
to be made. The target population should be defined in terms of
elements, sampling units, extent, and time.
An element is the object about which or from which the
information is desired, e.g., the respondent.
A sampling unit is an element, or a unit containing the element,
that is available for selection at some stage of the sampling
process.
Extent refers to the geographical boundaries.
Time is the time period under consideration.
4. Sampling frame- a representation of the elements of the target
population. It consist of a list or set of directions for identifying the target
population.
Sampling with/without replacement- a sampling technique in which an
element can/ cannot be included in sample more than once.
Sample size- no. of elements to be included in the study.
6. Types of Sampling Designs
Probability Sampling Method
• Simple Random Sampling
• Systematic Sampling
• Stratified Sampling
• Cluster Sampling Complex
•Multistage Random sampling
Non-Probability Sampling
Method
• Convenience Sampling
• Judgment Sampling
• Quota Sampling
•Snowball sampling
7. Non Probability sampling
Convenience sampling attempts to obtain a sample of
convenient elements. Often, respondents are selected
because they happen to be in the right place at the right time.
Selection of sampling units is entirely left on the least
expensive and less time consuming mode
Many potential sources of selection bias are present
Not recommended for descriptive and causal research but
can be used for exploratory research.
8. Judgement sampling is a form of convenience
sampling in which the population elements are
selected based on the judgment of the researcher
Examples:
Test markets selected to determine the potential of new
product
Purchase engineers selected in industrial marketing
research
9. Quota sampling may be viewed as two-stage restricted
judgmental sampling.
The first stage consists of developing control categories, or
quotas, of population elements. – to develop these quotas
the researcher lists relevant control characteristics and
determine the distribution of these characteristics in the
target population.The relevant control characteristics
(gender, age, race) are identified on the basis of judgment
In the second stage, sample elements are selected based
on convenience or judgment. Once the quota have been
assigned, there is considerable freedom of selecting the
element to be included in the sample. The only requirement
is that the element selected fit the control characteristics.
11. Snowball Sampling
In snowball sampling, an initial group of respondents is selected,
usually at random.
After being interviewed, these respondents are asked to identify
others who belong to the target population of interest.
Subsequent respondents are selected based on the referrals.
Even though probability sampling is used in this method to select
the initial respondents but later on the selection is non probability
one.
Advantage- increases the likelihood of locating the desired
characteristic in the population
Eg- selection of members of scattered minority population.
12. The probability or chance of every unit in the population being included
in the sample is known. Selection of the specific units in the sample
depends entirely on chance. every element is selected independently
of every other element and the sample is drawn by random procedure
from a sampling frame.
Simple Random Sampling : Draw of sample size (n) in such a way
that each of the ‘N’ members of the population has the same chance of
inclusion in sample.
Lottery method
Tippets number
Selection from a sequential list
Use of grid system
Probability Sampling
13. Simple Random Sampling
1. Select a suitable sampling frame.
2. Each element is assigned a number from 1 to N
(pop. size).
3. Generate n (sample size) different random numbers
between 1 and N.
4. The numbers generated denote the elements that
should be included in the sample.
14. Systematic Sampling
The sample is chosen by selecting a random
starting point and then picking every ith
element in
succession from the sampling frame.
The sampling interval, i, is determined by dividing
the population size N by the sample size n and
rounding to the nearest integer.
When the ordering of the elements is related to the
characteristic of interest, systematic sampling
increases the representativeness of the sample.
Complex Random Sampling Designs
15. If the ordering of the elements produces a cyclical
pattern, systematic sampling may decrease the
representative ness of the sample.
For example, there are 100,000 elements in the
population and a sample of 1,000 is desired. In this
case the sampling interval, i, is 100. A random
number between 1 and 100 is selected. If, for
example, this number is 23, the sample consists of
elements 23, 123, 223, 323, 423, 523, and so on.
16. Stratified Sampling
A two-step process in which the population, which is heterogeneous in
composition, is partitioned into subpopulations, or strata, having
homogeneous characteristics.
The strata should be mutually exclusive and collectively exhaustive
in that every population element should be assigned to one and only one
stratum and no population elements should be omitted.
Next, elements are selected from each stratum by a random procedure,
usually SRS.( at this stage it differs from quota sampling as in quota
sampling the allocation is on judgment and convenience basis)
A major objective of stratified sampling is to increase precision without
increasing cost.
17.
18. The elements within a stratum should be as
homogeneous as possible, but the elements in
different strata should be as heterogeneous as
possible.
Variables used to partition the population into strata
are referred as stratification variables.
The stratification variables should also be closely
related to the characteristic of interest.
Finally, the variables should decrease the cost of the
stratification process by being easy to measure and
apply.
19. In proportionate stratified sampling, the size of
the sample drawn from each stratum is
proportionate to the relative size of that stratum in
the total population.
ni = n. Ni/ (N1+ N2 + .. Nk)
In disproportionate stratified sampling, the size
of the sample from each stratum is proportionate to
the relative size of that stratum and to the standard
deviation of the distribution of the characteristic of
interest among all the elements in that stratum.
ni = n.Ni.sdi/ (N1sd1 + N2sd2 + … +Nksdk)
20. In addition to differences in stratum size and
variability, we may have differences in
stratum sampling cost. Here we can apply
the cost optimal disproportionate sampling
design where
Ci = cost of sampling in stratum I
21. Cluster Sampling
The target population is first divided into mutually
exclusive and collectively exhaustive
subpopulations, or clusters.
Then a random sample of clusters is selected,
based on a probability sampling technique such as
SRS.
For each selected cluster, either all the elements are
included in the sample (one-stage) or a sample of
elements is drawn probabilistically (two-stage).
23. Cluster Sampling
Elements within a cluster should be as heterogeneous as
possible, but clusters themselves should be as homogeneous as
possible. Ideally, each cluster should be a small-scale
representation of the population.
Area Sampling- if cluster happens to some geographic sub
division
In probability proportionate to size sampling, the clusters are
sampled with probability proportional to size. In the second
stage, the probability of selecting a sampling unit in a selected
cluster varies inversely with the size of the cluster.
25. Area Sampling
If clusters happen to be some geographic
subdivisions, in that case cluster sampling is
known as area cluster. All other features
remain the same.