An HTMLCollection object is an array-like list of HTML elements. Methods like the getElementsByTagName() returns an HTMLCollection. Properties and Methods The following properties and methods can be used on a HTMLCollection object: Property / Method Description item() Returns the element at the specified index in an HTMLCollection length Returns the number of elements in an […]
JavaScript Strings A JavaScript string stores a series of characters like “John Doe”. A string can be any text inside double or single quotes: var carname = “Volvo XC60”; var carname = ‘Volvo XC60’; String indexes are zero-based: The first character is in position 0, the second in 1, and so on. For a tutorial about Strings, read our JavaScript […]
Array Object The Array object is used to store multiple values in a single variable: var cars = [“Saab”, “Volvo”, “BMW”]; Array indexes are zero-based: The first element in the array is 0, the second is 1, and so on. For a tutorial about Arrays, read our JavaScript Array Tutorial. Array Properties Property Description constructor Returns the function that […]
Progress Object The Progress Object is new in HTML5. The Progress object represents an HTML <progress> element. The <progress> element represents the progress of a task. Access a Progress Object You can access a <progress> element by using getElementById(): Example var x = document.getElementById(“myProgress”); Try it Yourself » Create a Progress Object You can create a […]
Strong Object The Strong object represents an HTML <strong> element. Access a Strong Object You can access a <strong> element by using getElementById(): Example var x = document.getElementById(“myStrong”); Try it Yourself » Create a Strong Object You can create a <strong> element by using the document.createElement() method: Example var x = document.createElement(“STRONG”); Try it Yourself » Standard […]
Mark Object The Mark Object is new in HTML5. The Mark object represents an HTML <mark> element. Note: The <mark> element is not supported in Internet Explorer 8 and earlier versions. Access a Mark Object You can access a <mark> element by using getElementById(): Example var x = document.getElementById(“myMark”); Try it Yourself » Create a Mark Object […]
Ins Object The Ins object represents an HTML <ins> element. Access an Ins Object You can access an <ins> element by using getElementById(): Example var x = document.getElementById(“myIns”); Try it Yourself » Create an Ins Object You can create an <ins> element by using the document.createElement() method: Example var x = document.createElement(“INS”); Try it Yourself » Ins […]
Area Object The Area object represents an HTML <area> element. Access an Area Object You can access an <area> element by using getElementById(): Example var x = document.getElementById(“myArea”); Try it Yourself » Create an Area Object You can create an <area> element by using the document.createElement() method: Example var x = document.createElement(“AREA”); Try it Yourself » Area […]
One of the most common research questions is do different groups have different mean scores on some variable? This question is best answered in 3 steps: create a table showing mean scores per group -you’ll probably want to include the frequencies and standard deviations as well; create a chart showing mean scores per group; run some statistical test –ANOVA in this case. However, this […]
In some cases, ALTER TYPE in SPSS version 24 seems to report incorrect altered values when converting a string to a numeric value. This results in messed up data while SPSS reports that everything is fine. Let’s try and replicate the problem with the example below. Example We imported some .csv data in which some numeric values were flagged with an “a”. This indicates […]
In SPSS, we sometimes encounter variables that are negatively coded: lower values indicate higher agreement or more positive sentiments. Although this is not really “wrong” in any way, positive coding is more intuitive. Especially when reporting means over variables, most readers naturally expect higher means to indicate something better, not worse. So what’s the best way to reverse code variables? […]
SPSS DO REPEAT – Simple Tutorial & Examples SPSS LOOP – Quick Tutorial & Examples SPSS VECTOR – Quick Tutorial
Summary By default, SPSS right pads string values with spaces up to the length of their containing string variables. You don’t usually see this but it may complicate concatenating strings. Such complications are avoided by trimming off trailing spaces using RTRIM (right trim). In Unicode mode, RTRIM is applied automatically but it’s fine to use it anyway. Results of steps 6 and 7 of the […]
MATCH FILES is an SPSS command mostly used for merging data holding similar cases but different variables. For different cases but similar variables, use ADD FILES. MATCH FILES is also the way to go for a table lookup similar to VLOOKUP in Excel. Merging two datasets by id, which is a unique case identifier. SPSS Match Files – Basic Use The […]
Introduction An escape sequence is a combination of characters that has a special meaning. Escape Sequences in General Some characters imply a special function rather than their “normal” meaning. For example, ‘ often implies the start or the end of a string. But what if you actually mean ‘ rather than a string? In that case you can escape its default meaning by prefixing […]
SPSS Cochran Q test is a procedure for testing if the proportions of 3 or more dichotomous variables are equal in some population. These outcome variables have been measured on the same people or other statistical units. SPSS Cochran Q Test Example The principal of some university wants to know whether three examns are equally difficult. Fifteen […]
A substring is a subset of characters from a string. Extracting substrings in SPSS is done with CHAR.SUBSTR (SPSS versions 16+) or just SUBSTR (SPSS versions 15-). CHAR.SUBSTR takes two or three arguments as shown by the minimal example below. SPSS CHAR.SUBSTR – Minimal Example COMPUTE var_2 = CHAR.SUBSTR(var_1,3,2). The three arguments mean the following: var_1 denotes the variable […]
Always use the same coding conventions for all your JavaScript projects. JavaScript Coding Conventions Coding conventions are style guidelines for programming. They typically cover: Naming and declaration rules for variables and functions. Rules for the use of white space, indentation, and comments. Programming practices and principles Coding conventions secure quality: Improves code readability Make code maintenance easier […]
Hoisting is JavaScript’s default behavior of moving declarations to the top. JavaScript Declarations are Hoisted In JavaScript, a variable can be declared after it has been used. In other words; a variable can be used before it has been declared. Example 1 gives the same result as Example 2: Example 1 x = 5; // Assign 5 to x […]
A JavaScript Boolean represents one of two values: true or false. Boolean Values Very often, in programming, you will need a data type that can only have one of two values, like YES / NO ON / OFF TRUE / FALSE For this, JavaScript has a Boolean data type. It can only take the values true or false. The Boolean() Function You can […]
