COG170 Chapter 9 Summaries Cogito Fundamentals 2023-24 EXAM WITH ANS
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Course
COG 170
Institution
COG 170
How could you find out what options are available for you to use in dividing up a pie
chart, choosing categories for your bar graph, or setting up levels of a grouped
summary? - Answer Check the list of Available and Used columns in the Display tab of
your report.
What controls the list of avai...
How could you find out what options are available for you to use in dividing up a pie
chart, choosing categories for your bar graph, or setting up levels of a grouped
summary? - Answer Check the list of Available and Used columns in the Display tab of
your report.
What controls the list of available measures in SlicerDicer? - Answer Measures are
chosen from the list of filters (FDS records) available in a given data model.
True or False: In table components, the colored indicators can have different thresholds
for each row. - Answer True. On the Thresholds tab in the Output Format form, you can
specify overrides for each row to have its own thresholds.
What causes of concern would we have about a table component with the following
threshold settings?
Column Lower Bound Upper Bound Alert
Percent 34 67 Yellow
Percent 0 33 Green
Percent 68 Red
a. Percent thresholds should divide into perfectly equal parts (e.g. 33.33, 66.66)
b. The thresholds do not account for decimal percent values
c. Percent values are unavailable for threshold logic
d. Alerts should always be ordered from lowest to highest severity, or highest to lowest
severity - Answer b. The thresholds do not account for decimal percent values
Whichever summary format the report builder chooses, they will have to specify how the
data is grouped - what does that mean? - Answer Grouping - All summarization formats
fundamentally group data by common characteristics, and then perform summarization
functions on all the data which shares that characteristic.
What is a summarization function? - Answer Once data has been grouped,
summarization functions aggregate the data and define how it should be displayed for
each group. Choosing the wrong summarization function can obfuscate the data.
Define - Summarization Functions - Count - Answer Tells how many non null values
there are! Count - One of the most common summarization functions is count. Counting
a column means that for each group, your summary will show how many rows in the
group have a value in that column. Count does not care what the value is, only that it
, exists. This means the only rows not counted are those containing a NULL in the
counted column.
Define - Summarization Functions - Count Unique - Answer How many different values!
Counting unique values in a group is very different from performing a simple count.
Counting unique values will display the number of different values stored in a column for
each group. NULL values will still not be counted.
Define - Summarization Functions - Sum - Answer Adds together - Sum is only used for
numeric columns. It adds up the values in a column for each group. When adding up
numbers, neither a 0 nor a NULL will affect the total sum.
Define - Summarization Functions - Average - Answer Sum divided by Count - Average
is also applied to numeric values and can be thought of as Sum divided by Count. It is
important to recognize that since the denominator of this function is a Count, this means
that the number of NULL values will not be considered when calculating an average.
Define - Summarization Functions - Percentage - Answer A percentage can be thought
of as the ratio of two counts or two sums. One function is the numerator, and one
function is the denominator.
For a count-based percentage, it is common for the denominator to be a count of all
rows in the population, with a numerator being the count of all rows in the group. Since
both the numerator and the denominator are counts, no NULLs will be included in
either.
For a sum-based percentage, the denominator is usually the sum of all numbers in the
data set, while the numerator is the sum of then numbers in just one group. Since the
sum function does not include NULLs, both the numerator and denominator will ignore
them.
There are several common errors made when choosing how to summarize. Follow
these
rules. (list three) - Answer • DO NOT use a count function on numeric data to find total
amount.
• DO NOT use count unique unless you want to display "number of different values."
• When using an average function, find out if the column stores a NULL or a 0 when no
data is entered.
Which Function? choose the correct summarization function(s) you might need. How
much money did we charge in 2011? - Answer Sum
Which Function? choose the correct summarization function(s) you might need. How
many patients were seen in each clinic? - Answer Count Unique
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