The p-value provides an estimate of how often we would get the obtained result by chance if in fact, the null hypothesis is true. The P-value approach involves determining “likely” or “unlikely” by determining the probability — assuming the null hypothesis were true — of observing a more extreme test statistic in the direction of the alternative hypothesis than the one observed. If the P-value is small, say less than (or equal to) α, then it is “unlikely.” And, if the P-value is large, say more than α, then it is “likely.” If the P-value is less than (or equal to) α, then the...Read More
Month: September 2017
use a LENGTH statement to set the desired length of a character variable use the concatenation operator (| |) to join two or more character strings use the COMPBL function to convert multiple blanks in a character string to a single blank use the COMPRESS function to remove characters from a string use the VERIFY function to check that certain values are present in a character variable use the TRIM function to remove the trailing blanks from a character string use the SUBSTR function to select a subset of consecutive characters from a larger string use the SUBSTR...Read More
Commonly Used Statistical Procedures in SAS PROC MEANS There are over 30 different statistics you can request with the MEANS procedure. If you don’t specify any options, PROC MEANS will print the number of non-missing values, the mean, the standard deviation, and the minimum and maximum values for each variable. The VAR statement specifies which numeric variables to use in the analysis. If it is absent, SAS uses all numeric variables. If you use the PROC MEANS statement with no other statements, then you will get statistics for all observations and all numeric variable in your...Read More
Hypothesis Testing is one of the most important inferential tools in the application of statistics to real life problems. It’s used when we need to make decisions concerning populations, on the basis of only a sample. Statistical Hypothesis Testing is defined as assessing evidence provided by the data in favor of or against each hypothesis about the...Read More
Base SAS and SAS Programmer Interview Questions and Tips-Top SAS Interview Questions & Answers 1.Difference between do while and do until 2.Proc Report Vs Proc Print 3.Proc Append 4.SAS Formats Vs SAS Informats 5.Special input delimiters 6.Default statistics Displayed for Proc Means 7.Proc Means Vs Proc Freq Vs Proc Univariate 8.Compress data set using system options or data set options (COMPRESS=yes or COMPRESS=binary) 9.How to Compress a Table in SAS? 10.CROSSLIST option in TABLES statement? 11.How would you delete Observations(Duplicate observations)? Proc sort……nodups; proc sql..use distinct in Select 12.What is Tabulate.?Why we use it.? Which type of output we get from Tabulate.? 13.In...Read More
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