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1KA service can be used free of charge at 1KA.si domain. Only registration is required (new users) or login (registered users).

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We will use and store your email only for the purposes of using the 1KA username and will carefully protect it in accordance with the regulations. We will not pass on your email to third parties under any circumstances or use it for other purposes. We will keep your email as long as your account on 1KA is active. For each user, we store the following information: email address, name(nickname), user type, interface language, registration date, last login date, order(subscription) to receiving news.

In the event that you agree to receive notifications, we will send you important information about 1KA news, an invitation to an event, etc. on your email once a year. The exception is the first year of registration when we also send you an invitation to an evaluation survey. You can cancel receiving notifications at any time.

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Please, check if data are correct, especially the email address, since you will receive a confirmation email at the given email account.

Namely, often do the following problems occur:

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If you don't receive an e-mail in a few minutes, don't forget to check your spam folder.

Also, check if the entered email address is correct. Namely, often do the following problems occur:

Typos when entering an email address, for example: 'enkllikanketa@gmali.com'
Wrong address, for example, you logged in with another email address, so check all you email accounts
Unnecessary space, for example 'enklikanketa @ gmail.com'
Incorrect domain extension, for example, instead of 'enklikanketa@gmail.com' you entered 'enklikanketa@gmail.si' or 'enklikanketa@gmail.net'.

If you still have problems finding our confirmation e-mail, you can contact us by e-mail info@1ka.si.

You won't be able to login into this webpage until you confirm your registration through e-mail!

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What is the maximum number of categories to display using pie charts?

In case of large number of categories the display of categories in a form of a pie chart can lack transparency. When we’re setting limitations, it is useful to remember that the human eye can distinguish and remember no more than 12 categories that are displayed at the same time. Suggested number of categories to use, is substantially lower. Thus, for example, Excel recommends no more than 5-6 categories; Eagereyes recommends 5-7 categories; Haikudeck recommends up to 8 categories. Most of the other recommendations mention 6 categories (University of Leicester, University of Surrey Library, and Statistics Canada).

From the foregoing, therefore, follows that the appropriate number of categories to display in a pie chart is from 5 to 7.

It adds, however, that is better to avoid pie charts (and circle formats in general) – with few exceptions. Human cognitive and visual system is in principle much better in detecting differences between the length and height than the perception of differences within areas and corners.

We should especially emphasize that using three-dimensional presentations, where, for example, thickness is added to pie charts, is rather inappropriate. 3D presentations are an unnecessary obstacle to transmit key information about the relationships between categories to users and often send the wrong information.