1.04 Measures Of Central Tendency

Question 1

Besides summarizing data by means of tables and/or graphs, it can also be useful to describe the center of a distribution. We can do that by means of so-called measures of central tendency

1. MODE (начин)

Answer 1

The mode is the value that occurs most frequently! With other words - the most common outcome!

The mode is often used if a variable is measured on nominal or ordinal level.

Question 2

Besides summarizing data by means of tables and/or graphs, it can also be useful to describe the center of a distribution. We can do that by means of so-called measures of central tendency

2. MEDIAN (средна линия)

Answer 2

The MEDIAN - the middle value of your observations when they are ordered from smallest to the largest.

If the number of observations is even - the average value of the middle two values is taken.

Question 3

Besides summarizing data by means of tables and/or graphs, it can also be useful to describe the center of a distribution. We can do that by means of so-called measures of central tendency

3. MEAN (среднo аритметично)

Answer 3

The MEAN - is the sum of all the values devided by the number of observations.

X = Σx / n

Question 4

WHEN to use WHAT

• MODE
• MEDIAN
• MEAN

Answer 4

When the observation variables are from CATEGORICAL levels use

MODE

When they are from QUANTITATIVE use

MEDIAN or MEAN

If there are influential outliers (extreme different values) then use

MEDIAN