Writing a thesis or dissertation can be a lengthy, time-consuming journey. We provide statistical analysis help and consulting services for both quantitative and qualitative PhD dissertations and Master’s theses. Postgraduate research often involves statistical analysis.

If you need help with your dissertation statistics, please contact us to:

• perform all data analyses needed to answer your research questions
  

• provide you with a written report to help you understand the data analysis results

Example: Predicting car prices

The purpose of the dissertation was to determine which factors affect the price of the car.

As soon as we collected the data, we presented it graphically. For example, in the graph below you can see the percentage of each fuel type in the data.

A linear regression model was used to identify which factors affect the price. This model can be expressed mathematically as:

where y_i represents the dependent variable, x_i independent variables, and u is error term. Regression parameters (also called Betas) were estimated by ordinary least squares (OLS) method.

The table below shows the estimated parameters:

The p-value of Mileage is lower than 0.05. It means that this factor is statistically significant (at  5% significance level) and it does affect the price of the car.

The negative linear relationship between price and mileage is visualised in the scatterplot below:

The higher the mileage, the lower the price.