What is rescaling a variable?
Rescaling data is multiplying each member of a data set by a constant term k; that is to say, transforming each number x to f(X), where f(x) = kx, and k and x are both real numbers. Rescaling will change the spread of your data as well as the position of your data points.
How do I reverse a variable in Stata?
You will often need to recode values in your data for a number of reasons. For example, you may need to reverse-score items negatively-worded items on a measure. To do this via point and click, Go to Data -> Create or Change Data -> Other Variable Transformation Commands -> Recode Categorical Variable.
Can you combine variables in Stata?
Merging is another way of combining datasets. Where the append command adds rows, or observations, merge adds columns, or variables. A 1-‐to-‐1 merge combines datasets that have identifiers for single observations in each dataset. In this type of merge, Stata combines the data based on those identifiers.
How does rescaling affect the mean?
How does multiplying or dividing a constant amount by each value in a set of data ( also called rescaling) affect the mean? Multiplying or dividing all values will have the same affect on the mean since all values are changing equally.
How do you scale down values?
Divide by the maximum value: (0-500) becomes (0/500-500/500)=(0-1). So for 292, scaled it becomes 292/500.
What does log mean in Stata?
Description. log allows you to make a full record of your Stata session. A log is a file containing what you type and Stata’s output. You may start multiple log files at the same time, and you may refer to them with a logname. If you do not specify a logname, Stata will use the name .
How do you take the natural log of a variable in Stata?
Note: In Stata, ln(x)=log(x), in other words, log(x) defaults to natural log instead of log base 10. If you want log base 10, use log10(x).
How do you combine two variables?
Click the “Transform” menu at the top of the window and select “Compute” from the drop-down menu to open the Compute Variable dialog box. Type the name of your new variable in the space under “Target Variable.” This is the name of the variable you are creating by adding two or more other variables together.
What are the measures of position?
A measure of position determines the position of a single value in relation to other values in a sample or a population data set. Unlike the mean and the standard deviation, descriptive measures based on quantiles are not sensitive to the influence of a few extreme observations.