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VALIDITAS

VALIDITAS

  1. Analisis Instrumen Penelitian
    1. Validitas tiap butir soal

      Validitas adalah ukuran yang menunjukkan tingkat kevalidan suatu instrumen. Untuk menghitung validitas tiap butir soal digunakan rumus korelasi product momen berikut ini:


      (Suharsimi Arikunto, 2007: 72)

      Keterangan: Read the rest of this entry

Bijection

Bijective composition: the first function need...

Image via Wikipedia

A function is bijective if it is both injective and surjective. A bijective function is a bijection (one-to-one correspondence). A function is bijective if and only if every possible image is mapped to by exactly one argument. This equivalent condition is formally expressed as follows.

The function f: A \to B is bijective iff for all b \in B, there is a unique a \in A such that f(a) = b.
  • A function f : AB is bijective if and only if it is invertible, that is, there is a function g: BA such that g o f = identity function on A and f o g = identity function on B. This function maps each image to its unique preimage.
  • The composition of two bijections is again a bijection, but if g o f is a bijection, then it can only be concluded that f is injective and g is surjective. (See the figure at right and the remarks above regarding injections and surjections.)
  • The bijections from a set to itself form a group under composition, called the symmetric group.

 

SEE ALSO ::

injections, surjections and bijections

PYTHAGORAS GOES TO POWER POINT

HEHE

HEM,, tak asing lagi kita kenal yang namanya pythagoras.. hahaha

sebuah materi yang udah pernah kita pelajari pada waktu kelas 8 di SMP..

yah, karena seiring juga dengan tehnologi IT yang sudah berkembang pesat tentunya, kemasan materi pun jg harus bisa mengimbangi dong. makanya ini tak postingkan tentang power point sebuah pythagoras.. semoga bermanfaat… Amin

PYTHAGORAS

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