How to Perform Nonparametric Kernel Regression in Stata
Today i take you through Nonparametric Kernel Regression in Stata What’s this about? Nonparametric regression, like linear regression, estimates mean outcomes for a given set of covariates. Unlike linear regression, nonparametric regression is agnostic about the functional form between the outcome and the covariates and is therefore not subject to misspecification error. In nonparametric regression, […]
Common Stata Commands
Today I will teach you Common Stata Commands General Plotting Commands Plot a histogram of a variable:graph vn, bin(xx) Plot a histogram of a variable using frequencies:graph vn, bin(xx) freq Plot a histogram of a variable with a normal approximation:graph vn, bin(xx) normwhere xx is the number of bins. Plot a boxplot of a variable:graph vn, box […]
Confidence Intervals for the Mean When σ Is Unknown
Today i will teach you about Confidence Intervals for the Mean When σ Is Unknown When σ is known and the sample size is 30 or more, or the population is normally distributed if the sample size is less than 30, the confidence interval for the mean can be found by using the z distribution, as shown in Section 7–1. […]
Confidence Intervals and Sample Size
Today I will tech you about Confidence Intervals and Sample Size The main objective of this section is to explain the basics of estimating a parameter such as a mean, proportion, or variance. Sample measures (i.e., statistics) are used to estimate population measures (i.e., parameters). For example, a sample mean is used to estimate a […]
How to conduct Linear regression analysis using Stata
How to conduct Linear regression analysis using Stata Example Studies show that exercising can help prevent heart disease. Within reasonable limits, the more you exercise, the less risk you have of suffering from heart disease. One way in which exercise reduces your risk of suffering from heart disease is by reducing a fat in your […]
Types of Research Methods
Today i will discuss the Types of Research Methods Business research methods can be defined as “a systematic ad scientific procedure of data collection, compilation, analysis, interpretation, and implication pertaining to any business problem”. Types of research methods can be classified into several categories according to the nature and purpose of the study and other attributes. In […]
How to Conduct and Interpret a Multinomial Logistic Regression
Today I will teach you how to Conduct and Interpret a Multinomial Logistic Regression in SPSS What is Multinomial Logistic Regression? Multinomial Logistic Regression is the regression analysis to conduct when the dependent variable is nominal with more than two levels. Similar to multiple linear regression, the multinomial regression is a predictive analysis. Multinomial regression is […]
Understanding Three-way Interaction in ANOVA
Today i will teach you in Understanding Three-way Interaction in ANOVA Consider the three-way ANOVA, shown below, with a significant three-way interaction. There are 24 observations in this analysis. In this model a has two levels, b two levels and c has three levels. You will note the significant three-way interaction. Basically, a three-way interaction means that one, or more, two-way […]
Difference between One-tailed and Two-tailed Tests
Today, i will teach you about the Difference between One-tailed and Two-tailed Tests When you conduct a test of statistical significance, whether it is from a correlation, an ANOVA, a regression or some other kind of test, you are given a p-value somewhere in the output. If your test statistic is symmetrically distributed, you can […]
How to interpret odds ratio in logistic regression in Stata
interpret odds ratio in logistic regression in Stata Let’s begin with probability. Probabilities range between 0 and 1. Let’s say that the probability of success is .8, thus p = .8 Then the probability of failure is q = 1 – p = .2 Odds are determined from probabilities and range between 0 and infinity. […]
