This SAS© script demonstrates the use of the FREQ procedure (PROC FREQ) with the PLOT=FREQPLOT option to visualize frequency distributions. It presents several use cases illustrating the customization of frequency charts:
- Generation of a simple frequency chart for a variable ('TYPE') to visualize the distribution of its values.
- Sorting values by descending frequency (ORDER=FREQ) and changing the chart orientation to horizontal bars (ORIENT=HORIZONTAL) for better readability.
- Creation of bivariate frequency charts (cross-tables) where a distinct chart is produced for each value of the first variable, allowing analysis of the second variable's distribution by group.
- Use of the TWOWAY=STACKED option for stacked bar charts in the context of cross-tables, offering a comparative view of proportions.
Data Analysis
Type : SASHELP
The script uses the integrated `sashelp.cars` dataset, which is a standard demonstration dataset available by default in the SAS environment and does not require external creation or management.
1 Code Block
PROC FREQ
Explanation :
This code block generates a simple frequency chart for the 'TYPE' variable from the `sashelp.cars` dataset. The `plots=freqplot` option requests the creation of a visual bar chart representing the frequency of each unique value of the 'TYPE' variable.
This code block generates a simple frequency chart for the 'TYPE' variable from the `sashelp.cars` dataset. The `plots=freqplot` option requests the creation of a visual bar chart representing the frequency of each unique value of the 'TYPE' variable.
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| 1 | title "Frequency Distribution of TYPE"; |
| 2 | PROC FREQ DATA=sashelp.cars; |
| 3 | tables type / plots=freqplot; |
| 4 | RUN; |
2 Code Block
PROC FREQ
Explanation :
This block produces a frequency chart where the categories of the 'TYPE' variable are sorted by descending frequency (`order=freq` option). Additionally, the `plots=freqplot(orient=horizontal)` option changes the chart's orientation to display horizontal bars, potentially improving readability for certain distributions.
This block produces a frequency chart where the categories of the 'TYPE' variable are sorted by descending frequency (`order=freq` option). Additionally, the `plots=freqplot(orient=horizontal)` option changes the chart's orientation to display horizontal bars, potentially improving readability for certain distributions.
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| 1 | title "Descending Frequency Distribution of TYPE"; |
| 2 | PROC FREQ DATA=sashelp.cars order=freq; |
| 3 | tables type / plots=freqplot(orient=horizontal); |
| 4 | RUN; |
3 Code Block
PROC FREQ
Explanation :
This block illustrates the creation of a two-way frequency chart (a cross-table) for the 'ORIGIN' and 'TYPE' variables. The `plots=freqplot` option generates a distinct bar chart for each unique value of the 'ORIGIN' variable, showing the distribution of 'TYPE' within each origin.
This block illustrates the creation of a two-way frequency chart (a cross-table) for the 'ORIGIN' and 'TYPE' variables. The `plots=freqplot` option generates a distinct bar chart for each unique value of the 'ORIGIN' variable, showing the distribution of 'TYPE' within each origin.
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| 1 | title "Two-way Frequency Distribution of TYPE and ORIGIN"; |
| 2 | title2 "Separate Plots"; |
| 3 | PROC FREQ DATA=sashelp.cars; |
| 4 | tables origin*type / plots=freqplot; |
| 5 | RUN; |
4 Code Block
PROC FREQ
Explanation :
This last block presents an advanced two-way frequency chart with stacked bars (`twoway=stacked`) and a horizontal orientation. The bars are sorted by descending frequency (`order=freq`), and each stacked segment represents a 'TYPE' value within each 'ORIGIN', offering a visual comparison of the distributions of the two variables in an aggregated and detailed manner.
This last block presents an advanced two-way frequency chart with stacked bars (`twoway=stacked`) and a horizontal orientation. The bars are sorted by descending frequency (`order=freq`), and each stacked segment represents a 'TYPE' value within each 'ORIGIN', offering a visual comparison of the distributions of the two variables in an aggregated and detailed manner.
Copied!
| 1 | title "Two-way Descending Frequency Distribution of TYPE and ORIGIN"; |
| 2 | title2 "Stacked Bars"; |
| 3 | PROC FREQ DATA=sashelp.cars order=freq; |
| 4 | tables origin*type / plots=freqplot(twoway=stacked orient=horizontal); |
| 5 | RUN; |
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