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Statistical Data Analysis
Where Do/Does Data Come From?
Contrary to common belief, data analysis does not begin after the data
have been collected. It really begins during the early planning stages when we
are trying to decide
what data to collect
where the data should be obtained
how the data should be obtained
how much data should be collected
what analyses we will perform on the data after they have been collected
The above list is shocking to some people. They suppose that the quality of the
data is unimportant and that the use of powerful statistical methods can
compensate for deficiencies in the data themselves. This is simply not true.
The adage "garbage in, garbage out" has never been more true than in
We have worked on literally thousands of data analyses, and it is not uncommon
for us to be asked to analyze and interpret data that were obtained under
conditions that have been long-forgotten. At best, under these circumstances we
are able to get only conditional results with questionable confidence in any
conclusions drawn. It is even more sad when recently-collected data are given
to us for analysis and interpretation. Then when we delve into the details, we
find that there are problems that invalidate the data for answering the very
questions for which the data were collected.
Assuring that Your Data Will Answer the Questions You Have
If we expect to get good, unequivocal answers to our questions, we must deal
with all of the five items mentioned in the previous section. Otherwise, we can
be easily led to wrong conclusions. This is true for any study that depends
upon data for its conclusions--which should be every study.
We have met many "gut-feeling" decision makers who pride themselves on
being able to make good decisions without the aid of data. Unfortunately, none
of these self-proclaimed masters has been able to make good decisions
consistently. On the other hand, we have met many quiet, self-assured decision
makers who have learned to obtain good data, analyze it properly, and make
appropriate decisions based on the interpretation of the data.
What Kinds of Data Analyses Are We Talking About?
Data can be obtained from sample surveys, from automated equipment, from samples
taken on the shop floor, from shipping boxes, from orders being processed, and
from many other sources. What is important is that the iPad 2 Cases UK correct data be obtained
in the correct way in order to enable us to draw correct conclusions.
You may have important questions concerning any aspect of your company. Booth
Associates can help you to:
determine what data will answer your questions
set up a plan to obtain that data in an appropriate way
analyze your data after it is Naruto Cosplay Costumes collected
interpret the data correctly, based on the analyses
You can contact us by e-mail at Booth Associates.
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