Collecting, Presenting, and Analyzing Research Data By: Zainal A. Hasibuan Research methodology and Scientific Writing W# 9 Faculty of Computer Science University of Indonesia Nov 2011

Data 1. Collecting Data 2. Presenting Data 3. Analyzing Data

Source of Data Quantitative data are values on a numerical scale Qualitative data are observation measured on a numerical scale

Source of Data Source of data ContinuousDiscrete Qualitative (categorical) Quantitative (numerical) Discrete

Quantitative or Numerical Data Discrete Data – Only certain values are possible (there are gaps between the possible values) Continuous Data – Theoretically, any value within an interval is possible with a fine enough measuring device

Types of Data Primary data: data observed and recorded or collected directly from respondents Secondary data: data complied both inside and outside the organization for some purpose other than the current investigation

Types of Data Secondary Data Compilation Observation Experimentation Print or Electronic Survey Primary Data Collection Basic Business Statistics 10e, 2006 Prentice Hall

Categorical Data Ratio Data Interval Data Ordinal Data Nominal Data Differences between measurements, true zero exists Differences between measurements but no true zero Ordered Categories (rankings, order, or scaling) Categories (no ordering or direction) Height, Age, Weekly Food Spending Temperature in Fahrenheit, Standardized exam score Service quality rating, Standard & Poor’s bond rating, Student letter grades Marital status, Type of car owned Basic Business Statistics 10e, 2006 Prentice Hall

Validity and Reliability In science and statistics, validity has no single agreed definition but generally refers to the extent to which a concept, conclusion or measurement is well-founded and corresponds accurately to the real world.sciencestatistics In normal language, we use the word reliable to mean that something is dependable and that it will give the same outcome every time.

Collecting Data

Collecting Quantitative Data Identify your unit analysis – Who can supply the information that you will use to answer your quantitative research questions or hypotheses? Specify the population and sample Information will you collect – Specify variable from research questions and hypotheses – Operationally define each variable – Choose types of data and measures

Instrument Will You Use To Collect Quantitative Data Locate or develop an instrument Search for an instrument Criteria for choosing a good instrument – Have authors develop the instrument recently, and can you obtain the most recent version? – Is the instrument widely cited by other authors? – Are reviews available for the instrument? – Is there information about the reliability and validity of scores from past uses of the instrument? – Does the procedure for recording data fit the research questions/hypotheses in your study? – Does the instrument contain accepted scales of measurement?

Collecting Qualitative Data What information you collect? – Observations – Interviews and questionnaires – Documents – Audiovisual materials

Presenting Data

Interpreting Quantitative Data Preparing and organizing data for analysis in quantitative research, consists of: – scoring the data and creating a codebook, – determining the types of scores to use, – selecting a computer program, – inputting the data into the program for analysis, and the data.

Interpreting Qualitative Data Summarize Findings Convey Personal Reflections – Qualitative research believe that your personal views can never be kept separate from interpretations, personal reflections about the meaning of data are included in the research study. Make comparisons to the literature – The qualitative inquirer interprets the data in view of this past research, showing how the finding may support and/or contradict prior studies.

Interpreting Qualitative Data Offer limitations and suggestions for future research – The qualitative researcher suggest possible limitations or weaknesses of the study and make recommendations for future research.

Example Interpreting Qualitative Data KategoriFrekuensiFrekuensi relatif Persentase A3535/400=0.099% B260260/400=0.6565% C9393/400=0.2323% D1212/400=0.033% Total %

Representing Data as Graphs Graphic Pie Chart Buat legendnya:

Graphic Bar Chart Representing Data as Graphs

Penyusunan Distribusi Frekuensi Contoh : Data Tinggi Badan (Cm) Dari 50 Orang Dewasa

Distribusi Frekuensi Tinggi Badan Interval kelas FrekuensiJumlah 164, , , , , , , , , , , , , ,5 5 Jumlah50

Frequency Distribution Polygons

Frequency Distribution Bar Chart

Analyzing Data

Analyze Quantitative Data Describe trends in the data to a single variable or question on your instrument. – We need Descriptive Statistics that indicate: general tendencies in the data mean, median, mode, the spread of scores (variance, standard deviation, and rang), or a comparison of how one score relates to all others (z-scores, percentile rank). We might seek to describe any of our variables: independent, dependent, control or mediating.

Analyze Quantitative Data Compare two or more groups on the independent variable in terms of the dependent variable. – We need inferential statistics in which we analyze data from a sample to draw conclusions about an unknown population  involve probability. – We assess whether the differences of groups (their means) or the relationships among variables is much greater or less than what we would expect for the total population, if we could study the entire population.

Analyze Quantitative Data Relate two or more variable. – We need inferential statistics. Test hypotheses about the differences in the groups or the relationships of variables. – We need inferential statistics.

Thank You