Technical Interview Questions
The ANYDIGIT function is used to search for a character string. After the string is found it will simply return the desired string. In SAS, there is no built-in function called ANYDIGIT. It seems like this might be a made-up function or a function from a different programming language or context. It’s important in interviews … Read more
The basic syntax style of writing code in SAS is as follows: Write the DATA statement which will basically name the dataset. Write the INPUT statement to name the variables in the data set. All the statements should end with a semi-colon. There should be a proper space between word and a statement. In SAS … Read more
Variance and Covariance are two mathematical terms which are used frequently in statistics. Variance basically refers to how apart numbers are in relation to the mean. Covariance, on the other hand, refers to how two random variables will change together. This is basically used to calculate the correlation between variables. In case you have attended … Read more
The different types of hypothesis testing are as follows: T-test: T-test is used when the standard deviation is unknown and the sample size is comparatively small. Chi-Square Test for Independence: These tests are used to find out the significance of the association between categorical variables in the population sample. Analysis of Variance (ANOVA): This kind … Read more
Eigenvectors: Eigenvectors are basically used to understand linear transformations. These are calculated for a correlation or a covariance matrix. For definition purposes, you can say that Eigenvectors are the directions along which a specific linear transformation acts either by flipping, compressing or stretching. Eigenvalue: Eigenvalues can be referred to as the strength of the transformation … Read more