Extract a Year from a Date

Select Subtract two durations on the screen of the Date and Time Wizard labeled Do Calculations on Dates.

1. Select Duration Variables to Subtract.
2. Specify Result of Subtracting Two Duration Variables.

Select “Date” from the list of variable types. Then, on the right, select the format in which the date/time for that variable should appear (by selecting the date/time format in which the values already appear). Click OK. Now SPSS will recognize the variable as date/time.

Within SPSS date/time values are stored as the number of seconds since the start of the Gregorian calendar which is October 14, 1582. To get the duration of an event you will need to subtract the end date (end) from the start date (beg). The results will be reported number of seconds.

Create Time Series

1. From the menus choose: Transform > Create Time Series…
2. Select the time series function that you want to use to transform the original variable(s).
3. Select the variable(s) from which you want to create new time series variables. Only numeric variables can be used.

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

How to Compute Difference Scores in SPSS

1. Transform -> Compute Variable…
2. Name the variable to hold the new difference scores (in the Target Variable box)
3. Use the Numeric Expression box to calculate difference scores, using this format: Variable2Name – Variable1Name (or vice versa)
4. Click OK.

To automatically recode variables:

1. Click Transform > Automatic Recode.
2. Select the string variable of interest in the left column and move it to the right column.
3. Enter a new name for the autorecoded variable in the New Name field, then click Add New Name.
4. SPSS will assign numeric categories in alphabetical order.

Continuous variable
Continuous variable: a variable with infinite number of values, like “time” or “weight”.

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) .

How to Use the SPSS Date Time Wizard

1. Open the nenana2.
2. Choose Transform→Date and Time Wizard.
3. Select the Extract a Part of a Date or Time Variable radio button, and click Continue.
4. Choose DateTime as the Date or Time variable and Day of Week as the Unit to Extract, and click Continue.

The time-series plot is a univariate plot: it shows only one variable. It is a 2-dimensional plot in which one axis, the time-axis, shows graduations at an appropriate scale (seconds, minutes, weeks, quarters, years), while the other axis shows the numeric values.

Time series regression is a statistical method for predicting a future response based on the response history (known as autoregressive dynamics) and the transfer of dynamics from relevant predictors.

SPSS XDATE Function. Employees are supposed to be in before 10 AM. One way to flag late entries is to extract the hours from the entry times with XDATE. XDATE needs to be suffixed with the time unit we wish to extract as in XDATE.HOURS.

Date and Time Wizard. SPSS conveniently includes a Date and Time Wizard that can assist with transformations and calculations that involve date and time variables. To access the Date and Time Wizard, click Transform > Date and Time Wizard.

For comparing an SPSS time value to a normal time value (hours, minutes and seconds), simply convert the latter into seconds. TIME.HMS does just that. Next, simply use SPSS’ standard operators such as >, <= and others. For example, employees are not supposed to leave before 4 PM.

exe. SPSS XDATE extracts date components from date, time and datetime values. The syntax below thus shows how to extract the day, month and year from exit_moment. Note that XDATE.MDAY rather than XDATE.DAY returns the day of the month. *Extract day, month and year from datetime with XDATE.