تبلیغات
Case Method in Healthcare Operational Research Education - مروری بر مقیاسها
شنبه 31 اردیبهشت 1390  11:55 ق.ظ
نوع مطلب: (جلسه13 ،) توسط: امین ترابی

مروری بر مقیاسهای اندازه گیری:

1)      اسمی                                        كیفی

2)      ترتیبی (رتبه ای)

3)      فاصله ای                                   كمی

4)      نسبتی   

مقیاس اسمی: یعنی از اعداد به جای اسم پدیده استفاده كنیم.

فقط اسم گذاری است . یعنی جمع و تفریق نمی توانیم بكنیم   فقط می توانیم فراوانیش را بسنجیم

مثلاً در پرسشنامه                         زن                    مرد

                                                10                    2

مقیاس ترتیبی:

هر گاه یك سری پدیده را در یك مجموعه صورت صعودی به نزولی تنظیم كنیم  و جایگاه هر پدیده را با یك شماره نشان دهیم مقیاسمان مقیاس ترتیبی است.

مثلا افراد به ترتیب قد                   n    m       l      c      a

                                                1     2      3       4     5

فاصله ها در مقیاس ها ترتیبی معنی دار نیستند.

شاگرد               اول       2                      3          4

مدل                  20        75/19               18        16

مقیاس فاصله ای

اگر فاصله ها معنی پیدا كنند: مقیاس فاصله ای

میزان علاقه شما به .... چقدر است؟

 

                              1       2            3            4            5

                        خیلی كم   كم    متوسط    زیاد   خیلی زیاد         

اگر فاصله اینها با هم برابر نبود می شد ترتیبی یعنی شماره 5 برابر اینست اما در فاصله‌ای فاصله ها كاملاً مساوی است.

                                                0          1          2          3          4

خیلی زیاد

خیلی كم

فاصله ها برابر است اما نسبتها برابر نیستند.

مقیاس نسبتی

اگر نسبتها هم برابر بودند نسبتی می شد.

                                                                        اینچ                  سانتیمتر

1                                            5/2

2                                            5

3                                            5/7

اگر رابطه بین 2 عامل (اینچ و سانگ) y=ax

مقیاس نسبتی است.

اما اگر y                        y=a+bx

مقیاس فاصله ای                                                 فاصله ای

                                                                0          32

                                                                              5          41

                                                                              10        50


  • آخرین ویرایش:پنجشنبه 19 خرداد 1390
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