# How do I calculate the difference between two dates in SPSS?

## How do I calculate the difference between two dates in SPSS?

Suppose you have two variables, formatted as date1 = mm/dd/yyyy and date2 = mm/dd/yyyy . To calculate the number of days between date1 and date2 , use the following SPSS code: COMPUTE days = CTIME. DAYS(date2 – date1) .

### What variable is age in SPSS?

Age is a key demographic variable, frequently recorded in survey data as part of a broader set of demographic variables such as education, income, race, ethnicity, and gender.

#### How do you calculate aging from dates?

In some cultures, age is expressed by counting years with or without including the current year. For example, one person who is twenty years old is the same as one person who is in the twenty-first year of his/her life.

**How do you find the difference between two variables?**

How to Calculate Percentage Difference?

- Step 1: Find the difference between the two numbers, i.e a – b.
- Step 2: Then, find the average of two numbers, i.e (a+b)/2.
- Step 3: Take the ratio of the difference and the average.
- Step 4: Multiply the fraction obtained by 100 and simplify your answer.

**How do I calculate date variables in SPSS?**

Click Transform > Date and Time Wizard. Select Create a date/time variable from a string containing a date or time. Then click Next.

## How do I convert date to year in SPSS?

Extract a Year from a Date

- *1. Create mini test data. data list free/date(edate10). begin data. ’01/01/01′ ’12/12/12′ end data.
- *2. Extract the year. compute year_from_date = xdate. year(date). exe.
- *3. Hide decimals for year_from_date. format year_from_date(f4. 0).

### How do I enter age data in SPSS?

Entering Numeric Data

- Click the Variable View tab at the bottom of the Data Editor window.
- In the first row of the first column, type age .
- In the second row, type marital .
- In the third row, type income .
- Click the Data View tab to continue entering the data.
- In the age column, type 55 .
- In the marital column, type 1 .

#### How to calculate the difference between two dates in SPSS?

We want to compute how many days there are between the pretest and posttest measurements for each subject, and we want to record this data in a new variable. This is how it’s done using the Compute Variable dialog box. To begin, click Transform -> Compute Variable, which will bring up the Compute Variable dialog box.

**How to calculate age with date of birth in SPSS?**

How to Compute Age in SPSS? 1 1. Ensure Date of Birth is a Date Variable. The first thing we’ll do is check if date of birth is a real date variable. We readily see in variable 2 2. Choose a Comparison Date. 3 3. Compute Age with Known Completion Date. 4 4. Compute Age with Unknown Completion Date.

**What are the numbers in date.dmy in SPSS?**

Now, in first instance, DATE.DMY results in a variable holding huge numbers. These are the numbers of seconds between the year 1582 and my actual data as explained in SPSS Date Variables Basics. These huge numbers can be shown as normal dates by setting the appropriate formats.

## How are date time variables stored in SPSS?

In SPSS, date-time variables are treated as a special type of numeric variable. All SPSS date-time variables, regardless of whether they’re a date or a duration, are stored in SPSS as the number of seconds since October 14, 1582. This means that “under the hood”, date-time variables are actually integers!