Quantitive Methods Flashcards
What type of data involves collection or generation of data with specific task in mind?
Primary data
What type of data is collected for distribution and use by other interested parties?
Secondary data
What is defined as all members of a well defined group?
Population
What is a subset of a population?
Sample
If we wanted to achieve deeper understanding of population who would we collect from?
A subset of population.
What type of data can only take a finite number of different values and can be presented visually in pie or bar charts?
Discrete data
What type of data can take any value in an interval of a real line and can be presented visually in a histogram?
Continuous data
What type of graph involves grouping data in intervals and representing the frequency of occurrence of that interval by area of a bar?
Histogram
What graph plots pairs of values of two related variables on the same graph?
Scatter diagram
What statistics describe in summary essential features of a dataset and include measures of central tendency and measures of dispersion?
Descriptive statistics
If data are distributed such that the mode is less than the median which is less than the mean the distribution of data has what kind of skew?
Positive skew
If data are distributed such that the mean is less than the median which is less than the mode the distribution of data has what kind of skew?
Negative skew
What is a list of all possible outcomes of a variable along with relative frequency of occurrence? N
Probability distribution
What will all probabilities sum up to?
Unity because at least one outcome must occur when an experiment is conducted
What type of distribution occurs as a reasonable description for the outcomes of many naturally occurring phenomena?
Normal distribution
What is the special feature of normal distribution?
Median, mode and mean are identical and shape is perfectly symmetrical about this central point.
Why is normal distribution is important for testing hypotheses about key numbers or behaviours in finance?
Allows question whether observed numbers such as equity risk premium for one country over a period of time are consistent with particular hypothesised number.
What can we do with the hypothesised number?
Make probability statements about likelihood of particular sample number occurring. This acts as a check on reliability or credibility of theories.
How can we summarise a linear relationship between two variables?
By using bivariate linear regression in which one of the variables is dependent and may be estimated from other independent variables.
How do we choose the intercept and slope coefficients?
Using ordinary least squares and measure the goodness fit by the coefficient of determination.
What can we use to extrapolating or forecasting values of dependent variable?
Using linear regression.
What is involved to take value of 100 during selected base period?
Rescaling a variable
What does an index number always reflect?
The percentage change in variable relative to base year.
How do you rebase a series?
Index number in particular year is divided by index number in the new base and multiplied by 100