{"id":4991,"date":"2012-10-23T15:08:04","date_gmt":"2012-10-23T15:08:04","guid":{"rendered":"https:\/\/www.snapsurveys.com\/support-snap11\/?page_id=4991"},"modified":"2018-10-04T15:43:22","modified_gmt":"2018-10-04T14:43:22","slug":"patterns-categorise-postcodes-postal-area","status":"publish","type":"page","link":"https:\/\/www.snapsurveys.com\/support-snap11\/worksheets\/patterns-categorise-postcodes-postal-area\/","title":{"rendered":"Using patterns to categorise postcodes in to postal area"},"content":{"rendered":"

In last months worksheet we applied a pattern to validate or transform a quantity response during an interview. We will now look at applying a pattern at analysis stage. This particular example uses a derived variable in conjunction with a pattern to extract the postal area part from a full UK postcode.<\/p>\n

This example uses the Snap WebHost edition of the Crocodile survey which is provided with Snap.<\/p>\n

In this example, we will use a literal response, open ended question. This question has a source pattern of \u2018Postcode UK\u2019 applied. This pattern is pre-loaded within Snap and may be used to validate replies to literal response questions representing UK postcodes.<\/strong><\/p>\n

The UK postcode standard is made up of four components; Area, District, Sector and Unit. Each component is then broken down to accept a particular literal response as detailed in the table below:<\/p>\n\n\n\n\n\n\n\n
Component<\/th>\nAcceptable Literal Response<\/th>\nExample<\/th>\n<\/tr>\n
Area<\/strong><\/td>\n{letter}
\n{letter}{letter}<\/td>\n		B<\/strong>12 4LT BS35 3UW<\/td>\n<\/tr>\n
District<\/strong><\/td>\n{digit}
\n{digit}{digit}
\n{digit}{letter}<\/td>\n		BA3<\/strong> 4HT
\nBS35 <\/strong>3UW
\nSW1Y <\/strong>4RF<\/td>\n<\/tr>\n
Sector<\/strong><\/td>\n{digit}<\/td>\nBS35 3<\/strong>UW<\/td>\n<\/tr>\n
Unit<\/strong><\/td>\n{letter}{letter}<\/td>\nBS35 3UW<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Step by step<\/h3>\n
\n

Step 1<\/h3>\n

The first step is to create a new pattern that will extract postcode area from a full UK postcode.<\/strong>
\n\"Enter<\/p>\n

\"Variable<\/p>\n<\/div>\n

    \n
  1. \u00a0Select Tailor<\/strong> | Patterns<\/strong> from the main Snap toolbar.\n
    \n

    \"Patterns<\/p>\n<\/div>\n<\/li>\n

  2. Scroll down to the \u2018Postcode UK\u2019 pattern and highlight it.<\/li>\n
  3. Click [Clone]<\/strong> to make a copy of it.<\/li>\n
  4. Name the new pattern as UK Postal Area.<\/strong><\/li>\n
  5. Click in the Result<\/strong> box and clear the details. Right click, from the menu, select Component<\/strong> and then area,\u00a0<\/strong>\"{area}\"\u00a0will then appear in the Result box.\n
    \n

    \"Pattern<\/p>\n<\/div>\n<\/li>\n

  6. To test the pattern, click the \"Test...\"\u00a0button and type a postcode in the text box. If set up correctly, the result box should display just the area component of the postcode.<\/li>\n
  7. Click \"OK\u00a0to exit the pattern test and then click \"OK\u00a0again to save your pattern.<\/li>\n<\/ol>\n

    Step 2<\/h3>\n

    The second step is to create a derived variable that can be used in conjunction with the UK Postal Area pattern that you have created above.<\/strong>
    \n\"Pattern<\/p>\n

      \n
    1. Select the Variables icon \"VariablesButton\"\u00a0from the main Snap toolbar.<\/li>\n
    2. Click the \"plus\u00a0icon to create a new variable. Make a note of the name and enter \u2018Area\u2019 as the Label<\/li>\n
    3. The Type<\/strong> will be Derived<\/strong> and the Response<\/strong> will be Single<\/strong>.<\/li>\n
    4. In the bottom half of the screen, double click in the Label column, and add a code label of Birmingham<\/strong>.<\/li>\n
    5. Use the Tab key to move across to the Values column.<\/li>\n
    6. Type Q11 as UK Postal Area ==”B”<\/strong>\n
      Birmingham postcodes contain the letter B as the area component, e.g. B<\/strong>12 4LT. A value of Q11 as UK Postal Area =”B”<\/strong> will count any postal area containing B<\/strong> e.g. BS<\/strong>35 3UW which is a Bristol postcode. Therefore it is necessary to search for an exact match using = =.<\/div>\n<\/li>\n
    7. Tab again for the next code label which will be Bristol<\/strong>.
      \nThe value will be Q11 as UK Postal Area =”BS”<\/strong><\/li>\n
    8. Tab again for the next code label which will be Reading<\/strong>.
      \nThe value will be Q11 as UK Postal Area =”RG”<\/strong><\/li>\n
    9. To run the variable, click \"Count\u00a0which will display the results in the Counts column.\n
      \n

      \"Variable<\/p>\n<\/div>\n<\/li>\n

    10. Click \"Save\"\u00a0to save the derived variable.You can then use this new variable to create tables and charts.<\/li>\n<\/ol>\n

      If there is a topic you would like a worksheet on, email to snapideas@snapsurveys.com<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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